Airody Vasudeva Adhikari

Verified email at gmail.com

Professor, Yenepoya Research Centre, Yenepoya University
Yenepoya deemed to be University



                                   

http://researchid.co/vasudevaadhikari

Dr. A. Vasudeva Adhikari, at present, is working as Professor at Yenepoya Research Centre, Yenepoya deemed to be University, Mangalore. Earlier to this, he was serving as Professor - HAG in the Chemistry Department of National Institute of Technology Karnataka, Surathakal, from 1989, with 12 years of previous teaching experience at various institutes. He earned his masters (1976) from Mysore University) and a doctorate degree (1987) from Karnatak University, Dharwad, and he started carrying out his independent research from 1989 at NITK. He has made significant research contributions to Organic Chemistry/Material Science, seeking to utilize the newly synthesized organic small/macromolecules for different applications like Organic Electronics, Medicinal Fields, and Nonlinear Optics. He has published more than 140 peer-reviewed journal articles with about 3000 citations (h-index 31, and i10: 72) and more than 80 paper-presentations at various national and international conferences held in India and abroad. To his credit, he has one book chapter, six research projects, and memberships in many chemistry-related associations. He has successfully guided more than 20 Ph.D.s, 25 M.Sc., several B.Tech./M.Tech. projects during his 31 years of service at NITK. He has good experience in industry-institute interactions and consultancy activities gaining social, economic, and academic benefits.

EDUCATION

M.Sc. (Organic Chemistry, Mysore University), Ph.D. (Organic Chemistry Karnatak University)

RESEARCH INTERESTS

Synthetic Organic Chemistry: Molecular design of new organic molecules; Developing synthetic routes; Synthesis of new molecular entities with possible applications in Medicinal, Organic Electronics, and NLO fields; Retrosynthesis, Conducting polymers, Nanochemistry, Natural Products, Biofuels and Computational Studies (Broad Area: Chemical Biology)

FUTURE PROJECTS

Molecular design and synthesis of new indole-based hybrid molecules as potential anti-cancer agents

New indole-based hybrid heterocyclic scaffolds will be identified as anticancer agents based on Schrodinger’s software. These molecules with varied structural modifications will be synthesized, well-characterized, and evaluated for in vivo and in vitro anticancer properties to establish structure-property relationships. Thus, the lead molecule will be identified.


Applications Invited

Synthesis of new poly(pyrrole)-based nanocomposites for biosensing applications

New poly(pyrrole)s will be synthesized electrochemically and their nano-composites will be prepared and characterized. Their bio-sensing applications will be investigated and new devices will be fabricated as an analyzing tool.


Applications Invited

Applications of NMR Spectroscopy as an Important Tool for Metabolomics Research

NMR-based studies on metabolites in combination with LCMS tool: Characterization of various metabolites in biosamples.


Applications Invited
135

Scopus Publications

3743

Scholar Citations

32

Scholar h-index

76

Scholar i10-index

Scopus Publications

  • New cyanopyridine-based π-conjugative poly(azomethine)s: Synthesis, characterization and electroluminescence studies
    Naveenchandra Pilicode, Praveen Naik, K. M. Nimith, Madhukara Acharya, M. N. Satyanarayan, and Airody Vasudeva Adhikari

    Polymers for Advanced Technologies, ISSN: 10427147, eISSN: 10991581, Pages: 131-141, Published: January 2021 Wiley

  • Improving the Performance of Carbon-Based Perovskite Solar Modules (70 cm<sup>2</sup>) by Incorporating Cesium Halide in Mesoporous TiO<inf>2</inf>
    Kavya S. Keremane, Sateesh Prathapani, Lew Jia Haur, Annalisa Bruno, Anish Priyadarshi, Airody Vasudeva Adhikari, and Subodh G. Mhaisalkar

    ACS Applied Energy Materials, eISSN: 25740962, Published: 2021 American Chemical Society (ACS)

  • Simple thiophene-bridged D-π-A type chromophores for DSSCs: a comprehensive study of their sensitization and co-sensitization properties
    Kavya S. Keremane, Islam M. Abdellah, Praveen Naik, Ahmed El-Shafei, and Airody Vasudeva Adhikari

    Physical Chemistry Chemical Physics, ISSN: 14639076, Pages: 23169-23184, Published: 28 October 2020 Royal Society of Chemistry (RSC)
    DSSCs were fabricated using new dyes T1–4 as sensitizers/co-sensitizers along with the MH-12 dye. This work highlights the optimization of various factors involved in the cell as well as a complete analysis on their structure-performance behaviour.

  • Synthesis, physicochemical properties and computational study of donor–acceptor polymer for optical limiting application
    K. A. Vishnumurthy, K. H. Girish, and A. V. Adhikari

    SN Applied Sciences, eISSN: 25233971, Published: October 2020 Springer Science and Business Media LLC

  • Nicotinonitrile centered luminescent polymeric materials: Structural, optical, electrochemical, and theoretical investigations
    Naveenchandra Pilicode, Praveen Naik, and Airody Vasudeva Adhikari

    Polymer Engineering and Science, ISSN: 00323888, eISSN: 15482634, Pages: 2550-2559, Published: 1 October 2020 Wiley

  • Synthesis, characterization and electroluminescence studies of cyanopyridine-based π-conjugative polymers carrying benzo[: C] [1,2,5]thiadiazole and naphtho[1,2- c:5,6- c ′]bis([1,2,5]thiadiazole) units
    Naveenchandra Pilicode, Praveen Naik, Madhukara Acharya, and Airody Vasudeva Adhikari

    New Journal of Chemistry, ISSN: 11440546, eISSN: 13699261, Pages: 10796-10805, Published: 14 July 2020 Royal Society of Chemistry (RSC)
    Four new cyanopyridine based polymers, i.e.TDPy1-4 were designed, synthesized and well-characterized. The detailed studies reveal that the polymers own all the prerequisites required for the PLED application as active green light emitters.

  • Solvent selection for highly reproducible carbon-based mixed-cation hybrid lead halide perovskite solar cells via adduct approach
    Kavya S. Keremane, Sateesh Prathapani, Lew Jia Haur, Damodaran Bahulayan, Airody Vasudeva Adhikari, Anish Priyadarshi, and Subodh G. Mhaisalkar

    Solar Energy, ISSN: 0038092X, Volume: 199, Pages: 761-771, Published: 15 March 2020 Elsevier BV
    Abstract The major problem identified in carbon-based mixed cation perovskite solar cells (PSCs) is the selection of a suitable solvent for single-step solution-processed perovskite deposition in order to promote their scalable production. Herein we report a detailed study on the selection of appropriate solvent for the one-step deposition of cesium-formamidinium lead iodide (Cs0.1FA0.9PbI3) perovskite via Lewis acid-base adduct approach for fully printable mesoporous PSCs with mesoporous TiO2/ZrO2/C architecture. Highly reproducible Cs0.1FA0.9PbI3 solar cells were fabricated via adducts of PbI2 with eco-friendly dimethyl sulfoxide (DMSO). The best cells fabricated with the above approach yielded a photoconversion efficiency (PCE) of 12.33% for a small area device (active area: 0.09 cm2) and 10.1% for a large area device (active area 0.7cm2). The average power conversion efficiency for 62 PSCs was found to be 10.5% under an AM 1.5G illumination. Finally, the mixed cation perovskite in carbon architecture using the Lewis acid-base adduct approach is remarkably stable, with less than 1% change from the initial PCE after 1800h of storage under dark ambient conditions (25 °C, 60–70% RH).

  • New cyanopyridine based conjugated polymers carrying auxiliary electron donors: From molecular design to blue emissive PLEDs
    Naveenchandra Pilicode, Praveen Naik, K.M. Nimith, Madhukara Acharya, M.N. Satyanarayan, and Airody Vasudeva Adhikari

    Dyes and Pigments, ISSN: 01437208, eISSN: 18733743, Volume: 174, Published: March 2020 Elsevier BV
    Abstract Three new D-A (Donor-Acceptor) configured conjugated polymers, i.e. PPy1-3, centered on strong electron accepting cyanopyridine scaffold carrying varied auxiliary donors, viz. phenylene (PPy1), biphenyl (PPy2), and fluorene (PPy3) were designed and synthesized as blue emitters for PLEDs. The new polymers were subjected to spectral, thermal, photophysical and electrochemical characterization. Also, computational studies (DFT) were performed on the repeating units of polymer using Turbomole 7.2 V software package at the B3LYP/TZVP hybrid levels. Further, their weight average molecular masses were found to be 38.8 kDa, 38.9 kDa and 57.7 kDa, respectively as determined by GPC technique. Furthermore, the new polymers PPy1-3, were shown to be stable thermally up to 308–374 °C. Evidently, they exhibited good photophysical behavior with their optical energy band gaps of 2.53–2.64 eV. Finally, the polymers PPy1-3 were employed as an active emissive layer in standard ITO/PEDOT:PSS/Polymer/Al configured PLEDs. Interestingly, at 12 V all the newly fabricated devices exhibit a stable blue characteristic electroluminescence with low threshold voltages of 3.40–5.20 V, confirming an efficient injection of electrons in the diodes. From the results, it is clear that, the polymers PPy1-3, can be considered as prospective blue light emitters for PLED application.

  • Simple 3,6-disubstituted Carbazoles as Potential Hole Transport Materials: Photophysical, Electrochemical and Theoretical Studies
    Kavya S. Keremane, Rathnamala Rao, and Airody Vasudeva Adhikari

    Photochemistry and Photobiology, ISSN: 00318655, eISSN: 17511097, Published: 2020 Wiley
    Developing effective and low-cost organic hole-transporting materials (HTMs) is crucial for the construction of high-performance perovskite solar cells (PSCs) and to promote their production in commercial ventures. In this context, we herein report the molecular design, synthesis, and characterization of two novel D-A-D-A-D architectured 9-(2-ethylhexyl)-9H-carbazoles, connecting the mono/dimethoxy phenyl substituted cyanovinylene side arms symmetrically at 3rd and 6th positions of the carbazole heterocycle (CZ1-2 ), as potential hole-transporting materials (HTMs). The current work highlights their structural, photophysical, thermal, electrochemical, and theoretical investigations, including their structure-property correlation studies. Evidently, the optical studies showcased their excellent fluorescence ability due to their push-pull natured structure with extended π-conjugation. Further, in-depth solvatochromic studies demonstrated their intramolecular charge-transfer (ICT) dominated optoelectronic behavior, supported by various correlation studies. Also, the optical results revealed that CZ1  and CZ2 display λabs  and λemi  in the order of 410-430 nm and 530-560 nm, respectively, with a bandgap in the range of 2.5-2.6 eV. Finally, their quantum chemical simulations have provided an insight into the predictions of their structural, molecular, electronic, and optical parameters. Conclusively, the study furnishes a deeper understanding of the intricacies involved in the structural modification of carbazole-based HTMs for achieving better performance.

  • Simple thiophene based organic dyes as active photosensitizers for dssc application: From molecular design to structure property relationship
    Kavya S. Keremane, , Praveen Naik, Airody Vasudeva Adhikari, , and

    Journal of Nano- and Electronic Physics, ISSN: 20776772, eISSN: 23064277, Published: 2020 Sumy State University

  • Asymmetric Dual Anchoring Sensitizers/Cosensitizers for Dye Sensitized Solar Cell Application: An Insight into Various Fundamental Processes inside the Cell
    Rajalakshmi Kesavan, Fathy Attia, Rui Su, P. Anees, Ahmed El-Shafei, and Airody Vasudeva Adhikari

    Journal of Physical Chemistry C, ISSN: 19327447, eISSN: 19327455, Volume: 123, Pages: 24383-24395, Published: 10 October 2019 American Chemical Society (ACS)
    To study the various fundamental processes occurring inside the dye sensitized solar cell (DSSC), we have fabricated devices employing newly synthesized diphenylamine-based organic dyes with A-D-π-A configuration, carrying four different anchoring groups, namely, cyanoacetic acid (DDC), rhodanine acetic acid (DDR), 4-hydrazinylbenzoic acid (DDH), and barbituric acid (DDB), as effective sensitizers/cosensitizers. In the present work, all the bianchoring dyes were subjected to photophysical, electrochemical, thermodynamic, photoelectrochemical, and theoretical studies. All of them displayed characteristic λabs and λemi in the range of 415–480 and 570–680 nm, respectively. Their optical and electrochemical band gaps were calculated to be in the order of 2.1 to 2.3 eV. The calculated driving forces for electron injection (ΔGinj), recombination (ΔGinj), and regeneration (ΔGreg) processes were found to be negative, showing the feasibility of these processes, while their DFT studies clearly indicated the directi...

  • Self-assembly of taper- and wedge-shaped maleimide derivatives: Synthesis and structure-property relationship
    D.R. Vinayakumara, Sandeep Kumar, S. Krishna Prasad, and Airody Vasudeva Adhikari

    Journal of Molecular Liquids, ISSN: 01677322, Volume: 284, Pages: 765-772, Published: 15 June 2019 Elsevier BV
    Abstract Herein, we describe design and synthesis of five new amphiphilic systems, viz. 10b-c and 11a-c composed of maleimide at the focal point and alkoxy phenyl ring at the periphery. Their self-assembling behaviour was examined systematically by varying the length of hydrophobic part and aromatic core segment. Evidently, on increasing the aromatic core length, maleimide based amphiphiles relatively emerge as two distinct molecular structures, i.e. wedge- and tapered-shaped. The mesomorphic studies of the two series reveal that, tapered-shaped maleimide derivatives assemble into a smectic A phase with an interesting phasmidic arrangement, whereas the wedge-shaped molecules exclusively form a prospective supramolecular hexagonal columnar mesophase through the intermolecular hydrogen-bonding via maleimide head group. These self-assembled materials could demonstrate high-sensitivity towards various external stimuli.

  • New blue light emitting cyanopyridine based conjugated polymers: From molecular engineering to PLED applications
    Naveenchandra Pilicode, Nimith K. M, Madhukara Acharya, Praveen Naik, Satyanarayan M. N, and Airody Vasudeva Adhikari

    Journal of Photochemistry and Photobiology A: Chemistry, ISSN: 10106030, Volume: 378, Pages: 38-45, Published: 1 June 2019 Elsevier BV
    Abstract In this work, we report the design of three new cyanopyridine scaffold based polymers, viz. TPy1-3 as potential blue light emitters for PLED applications. The new polymer design comprise, a cyanopyridine core as an electron accepting entity, thiophene as an electron donating unit with different auxiliary donors, viz. phenylene (TPy1), biphenyl (TPy2), and fluorene (TPy3), and have been synthesized, following standard synthetic protocols including Suzuki-cross coupling polymerization reaction. Further, in order to assess all the prerequisites to act as an active emitter, the polymers TPy1-3, were subjected to structural, thermal, linear optical, electrochemical and computational studies. The results revealed that, all the polymers were thermally stable up to 300 ⁰C and their estimated optical band-gaps were found to be 2.59–2.80 eV. Finally, new polymer light emitting diode (PLED) were fabricated by employing the polymers TPy1-3, as active emissive material with a configuration of ITO/PEDOT: PSS/Polymer/Al. Interestingly, all the fabricated devices, exhibited an intense blue electroluminescence at 12 V with low threshold voltages of 4.2–4.8 V, signifying an effective injection of electron in the device.

  • Reduction of nitro compounds carrying electron withdrawing groups: A convenient approach without metal catalyst
    K.A. Vishnumurthy and A.V. Adhikari

    Chemical Data Collections, eISSN: 24058300, Published: April 2019 Elsevier BV
    Abstract In this communication we report a convenient reduction technique for conversion of electron deficient aromatic nitro compounds to corresponding amino derivatives using hydrazine hydrate without any metal catalyst. The reduction process is carried out in different solvents under heating condition and microwave irradiation. In this method three novel substituted amines were synthesized from their respective nitro compounds with quantitative yield. Interestingly, the reduction process went smoothly without formation of any side product. The reaction is highly selective to nitro compounds without affecting ester functionality. Further it has been observed that the nature of substituent attached to nitro compound has a major role in reduction rate. As electron withdrawing nature increases the reduction takes place faster. Also it has been observed that the reaction is even faster in microwave irradiation without using of any organic solvent. The probable mechanism of reduction of nitro compound has been highlighted.

  • Highly fluorescent materials derived from ortho-vanillin: Structural, photophysical electrochemical and theoretical studies
    Sachin Poojary, Madhukara Acharya, Abdul Ajees Abdul Salam, Dhananjaya Kekuda, Upendra Nayek, S. Madan Kumar, Airody Vasudeva Adhikari, and Dhanya Sunil

    Journal of Molecular Liquids, ISSN: 01677322, Volume: 275, Pages: 792-806, Published: 1 February 2019 Elsevier BV
    Abstract Small-molecule organic fluorophores are highly in demand attributed to their extensive prospective in material and biomedical applications. Particularly, luminescent π-conjugated organic molecules that possess an efficient solid-state emission are excellent candidates for optoelectronic devices. Focusing on high demand of organic fluorophores, we herein report the synthesis of three organic fluorescent materials derived from o‑vanillin, viz. an ester (F1), an azine (F2) and an azo dye (F3). Interestingly, F2 exhibited very intense luminescence in its aggregate phase due to the restriction in intra-molecular rotation (RIR), as demonstrated by solution thickening studies. Further, its Single Crystal X-ray Crystallography (SCXRD) study suggested the existence of various intra and inter molecular interactions and gave evidences for locked intra-molecular rotations of the benzene rings in the rigid conformation of the molecule. The bathochromic shift in fluorescence from solution to solid phase was confirmed by its thin-film emission spectrum, which evidences the formation of J-aggregates. The observed RIR, development of J-aggregates and high conjugation in F2 impart an excellent fluorescence in its aggregated state. Thin films of both F2 and F3 on ITO plates exhibited a bathochromic shift with a deep orange to red photoluminescence on UV excitation. Furthermore, the morphological characterization revealed the presence of clear dense grains in case of F2 and F3, while the DSC analysis indicated phase transitions of all the derivatives. As seen from dielectric measurement studies, the azo dye F3 exhibited the highest dielectric constant among the three derivatives. The electronic and photophysical data based on Density Functional Theory (DFT) and Time Dependent-DFT (TD-DFT) calculations are in agreement with the experimental results. All the above data clearly advocate that, the synthesized fluorophoric o‑vanillin derivatives are excellent candidates for electro-optical devices.

  • Supramolecular columnar self-assembly of wedge-shaped rhodanine based dyes: Synthesis and optoelectronic properties
    D.R. Vinayakumara, Sandeep Kumar, and Airody Vasudeva Adhikari

    Journal of Molecular Liquids, ISSN: 01677322, Volume: 274, Pages: 215-222, Published: 15 January 2019 Elsevier BV
    Abstract The development of small π-conjugated functional organic molecules capable of forming supramolecular columnar self-assembly, is a rapidly growing area of material research. In this context, the present work describes the design and synthesis of a new series of wedge-shaped rhodanine derivatives with D-A configuration, viz. RA1–RA5. Their LC properties were studied by employing DSC, POM and XRD techniques. The mesophase behavior was investigated as a function of chain length, density and position of alkoxy terminals to understand structure-property relationship. Interestingly, the longer chain analog, i.e. RA3 demonstrated H-bonded disc-like macrocyclic structures, causing an imperative columnar hexagonal phase at ambient temperature. Further, their photophysical and electrochemical properties were evaluated. They showed a good dye property attributing to effective intramolecular interactions, as confirmed by experimental and theoretical studies. Conclusively, RA3 has been considered to be a potential candidate for its application in organic electronics.

  • New cyanopyridone-based unsymmetrical dyads: The effect of donor strength on their optoelectronic properties
    D. R. Vinayakumara, Rajalakshmi Kesavan, Sandeep Kumar, and Airody Vasudeva Adhikari

    Photochemical and Photobiological Sciences, ISSN: 1474905X, eISSN: 14749092, Pages: 2052-2060, Published: 2019 Royal Society of Chemistry (RSC)
    Here, we deliberated the effect of donor strength on the electro-optical properties of D–A–D′ configured new cyanopyridone dyads by means of detailed experimental and theoretical studies.

  • Columnar self-assembly of novel benzylidenehydrazones and their difluoroboron complexes: Structure-property correlations
    D. R. Vinayakumara, K. Swamynathan, Sandeep Kumar, and Airody Vasudeva Adhikari

    New Journal of Chemistry, ISSN: 11440546, eISSN: 13699261, Pages: 7099-7108, Published: 2019 Royal Society of Chemistry (RSC)
    A series of prospective columnar liquid crystalline materials derived from novel organoboron complexes has been developed by virtue of their application in organic electronic devices.

  • Simple diphenylamine based D-π-A type sensitizers/co-sensitizers for DSSCs: A comprehensive study on the impact of anchoring groups
    Rajalakshmi Kesavan, Islam M. Abdellah, Surya Prakash Singh, Ahmed El-Shafei, and Airody Vasudeva Adhikari

    Physical Chemistry Chemical Physics, ISSN: 14639076, Pages: 10603-10613, Published: 2019 Royal Society of Chemistry (RSC)
    Three new diphenylamine based metal-free dyes were designed and developed as efficient sensitizers as well as co-sensitizers along with N3 in DSSCs. Their detailed photophysical, electrochemical, theoretical and photovoltaic properties have been explored.

  • New fluorescent columnar mesogens derived from phenanthrene-cyanopyridone hybrids for OLED applications
    D. R. Vinayakumara, Hidayath Ulla, Sandeep Kumar, M. N. Satyanarayan, and Airody Vasudeva Adhikari

    Materials Chemistry Frontiers, eISSN: 20521537, Pages: 2297-2306, Published: December 2018 Royal Society of Chemistry (RSC)
    We report the design, synthesis, and self-assembly of a novel series of pseudodiscoid dyads comprising electron-rich dialkoxyphenanthrene and trialkoxyphenyl rings appended to an electron-deficient cyanopyridone core.

  • An Efficient Aniline-Based Co-Sensitizer for High Performance N3-Sensitized Solar Cells
    Praveen Naik, Islam M. Abdellah, M. Abdel‐Shakour, Madhukara Acharaya, Naveenchandra Pilicode, Ahmed El‐Shafei, and Airody Vasudeva Adhikari

    ChemistrySelect, eISSN: 23656549, Pages: 12297-12302, Published: 23 November 2018 Wiley

  • Improvement in performance of N3 sensitized DSSCs with structurally simple aniline based organic co-sensitizers
    Praveen Naik, Islam M. Abdellah, M. Abdel-Shakour, Rui Su, Kavya S. Keremane, Ahmed El-Shafei, and Airody Vasudeva Adhikari

    Solar Energy, ISSN: 0038092X, Volume: 174, Pages: 999-1007, Published: 1 November 2018 Elsevier BV
    Abstract In this work, we report comprehensive photovoltaic investigation of four structurally simple D-A configured organic dyes, A1-4 as active co-sensitizers in DSSCs sensitized with well-known Ru (II) based N3 dye. These effective co-sensitizers (A1-4) comprise N,N-dimethylaniline ring as donor scaffold linked with electron withdrawing functionalities, viz. barbituric acid (A1), N,N-dimethyl barbituric acid (A2), thiobarbituric acid (A3), and N,N-diethyl thiobarbituric acid (A4) as acceptor/anchoring units. In the present study, for the first time we have demonstrated the profound role of various simple organic molecules carrying different heterocyclic anchoring units on the photovoltaic parameters of the N3 sensitized devices. Also, the effect of concentration of sensitizer/co-sensitizers on the device performance characteristics has been investigated in depth. From the results, it is evident that, the device fabricated using co-sensitizer A2 carrying N,N-dimethyl barbituric acid along with sensitizer N3 in all concentrations outperformed when compared to N3 alone or other co-sensitizers. Interestingly, the best photovoltaic performance was obtained for the co-sensitized device fabricated using 0.3 mM co-sensitizer A2 along with 0.2 mM of N3 sensitizer. It displayed PCE of 7.02% with JSC of 15.27 mA·cm−2, VOC of 0.671 V and FF of 68.47%. Thus, the observed results have thrown new light upon the device optimization to yield DSSCs with improved performance by the selection of matchable co-sensitizers at appropriate concentrations.

  • New cyanopyridine based conjugative polymers as blue emitters: Synthesis, photophysical, theoretical and electroluminescence studies
    Naveenchandra Pilicode, Nimith K M, Satyanarayan M N, and Airody Vasudeva Adhikari

    Journal of Photochemistry and Photobiology A: Chemistry, ISSN: 10106030, Volume: 364, Pages: 6-15, Published: 1 September 2018 Elsevier BV
    Abstract Herein, we report the design of three new blue light emitting conjugated polymers (Th-Py-1, Th-Py-2 and Th-Py-3), carrying cyanopyridine ring as a strong electron accepting unit and thiophene as well as phenylene vinylene scaffolds with different substituents, as electron donating moieties. The newly designed monomers/polymers were synthesized using well-known synthetic protocols such as cyclocondensation, O-alkylation, Suzuki cross coupling, Wittig and Knoevenagel reactions. They were well-characterized by spectral, thermal, photophysical, electrochemical and gel permeation chromatography (GPC) techniques. Further, they were subjected to theoretical studies using DFT simulations, performed at B3LYP/TZVP level using Turbomole 7.2 V software package. The new polymers were tested in PLED devices (ITO/PEDOT: PSS/Polymer/Al) as emissive materials. Optical studies revealed that, all the polymers displayed light absorption in the range of 377–397 nm and blue light emission in the order of 432–482 nm, respectively. Further, their band-gaps were calculated to be in the order of 2.55–2.64 eV using both optical and electrochemical data. Furthermore, the TGA study indicated that, they possess good thermal stability with onset decomposition temperature, greater than 300 ⁰C under nitrogen atmosphere. Interestingly, use of these polymers in new PLEDs as emissive layers, has shown improved performance when compared to previously reported polymers in similar type of devices. They show blue light emission with a low threshold voltage of 3.5–3.9 V, affirming an efficient electron injection in the diodes.

  • Highly efficient carbazole based co-sensitizers carrying electron deficient barbituric acid for NCSU-10 sensitized DSSCs
    Praveen Naik, Kavya S. Keremane, Mohamed R. Elmorsy, Rui Su, Ahmed El-Shafei, and Airody Vasudeva Adhikari

    Solar Energy, ISSN: 0038092X, Volume: 169, Pages: 386-391, Published: 15 July 2018 Elsevier BV
    Abstract Herein, we report a comparative study of four interesting metal-free carbazole based organic dyes with different structural configurations, carrying electron deficient barbituric acid (C1-4), as effective co-sensitizers in DSSCs sensitized with NCSU-10 dye. The new entities comprise different structural architectures, viz. D-A (C1), D-π-A (C2), D-D-π-A (C3) and D-A-π-A (C4) configurations with same accepting/anchoring moiety. They consist of carbazole as donor scaffold linked to barbituric acid as an acceptor/anchoring unit via different π-spacers. This paper describes the study of all the four co-sensitizers with regard to their structural, photophysical, electrochemical, theoretical and photovoltaic investigations. Also, it includes their structure-performance correlation study in detail. The devices co-sensitized with C1-4 displayed the superior photovoltaic performance when compared to NCSU-10 alone. The results ameliorate the role of efficient co-sensitizers to yield DSSC with improved performance.

  • New carbazole based dyes as effective co-sensitizers for DSSCs sensitized with ruthenium (II) complex (NCSU-10)
    Praveen Naik, Rui Su, Mohamed R. Elmorsy, Ahmed El-Shafei, and Airody Vasudeva Adhikari

    Journal of Energy Chemistry, ISSN: 20954956, Pages: 351-360, Published: 1 March 2018 Elsevier BV
    Abstract Herein, we report the design and synthesis of three new D–A type metal-free carbazole based dyes (S1–3) as effective co-sensitizers for dye-sensitized solar cell (DSSC) sensitized with Ru(II) complex (NCSU-10). In this new design, the electron rich carbazole unit was attached to three different electron withdrawing/anchoring species, viz. 4-amino benzoic acid, sulfanilic acid and barbituric acid. The dyes were characterized by spectral, photophysical and electrochemical analysis. Their optical and electrochemical parameters along with molecular geometries, optimized from DFT have been employed to apprehend the effect of the structures of these co-sensitizers on the photovoltaic performances. Further, S1–3 dyes were co-sensitized along with a well-known NCSU-10 dye in order to broaden the spectral response of the co-sensitized devices and hence improve the efficiency. The photovoltaic performance studies indicated that, the device fabricated using S1 dye as co-sensitizer with 0.2 mM of NCSU-10 exhibited improved PCE of 9.55% with JSC of 22.85 mA cm−2, VOC of 0.672 V and FF of 62.2%, whereas the DSSC fabricated with dye NCSU-10 (0.2 mM) alone displayed PCE of 8.25% with JSC of 20.41 mA cm−2, VOC of 0.667 V and FF of 60.6%. Furthermore, electronic excitations simulated using time-dependent DFT, were in good agreement with the experimentally obtained results of the co-sensitizers, indicating that the exchange-correlation function and basis set utilized for predicting the spectra of the co-sensitizers are quite appropriate for the calculations. In conclusion, the results showed the potential of simple organic co-sensitizers in the development of efficient DSSCs.

RECENT SCHOLAR PUBLICATIONS

  • Simple 3, 6‐disubstituted Carbazoles as Potential Hole Transport Materials: Photophysical, Electrochemical and Theoretical Studies
    KS Keremane, R Rao, AV Adhikari
    Photochemistry and Photobiology 97 (2), 289-300 2021

  • Simple carbazole derivatives with mono/dimethoxyphenylacrylonitrile substituents as hole‐transporting materials: Performance studies in hybrid perovskite solar cells
    KS Keremane, AV Adhikari
    Electrochemical Science Advances, e2000036 2021

  • Improving the Performance of Carbon-Based Perovskite Solar Modules (70 cm2) by Incorporating Cesium Halide in Mesoporous TiO2
    KS Keremane, S Prathapani, LJ Haur, A Bruno, A Priyadarshi, ...
    ACS Applied Energy Materials 2020

  • Nicotinonitrile centered luminescent polymeric materials: Structural, optical, electrochemical, and theoretical investigations
    N Pilicode, P Naik, AV Adhikari
    Polymer Engineering & Science 60 (10), 2550-2559 2020

  • Synthesis, physicochemical properties and computational study of a donor-acceptor polymer for optical limiting application
    AVA K. A. Vishnumurthy, K. H. Girish
    SN Applied Sciences 2 (-), - 2020

  • Simple thiophene-bridged D-π-A type chromophores for DSSCs: A comprehensive study on their sensitization and co-sensitization properties
    KS Keremane, IM Abdellah, P Naik, A El-Shafei, AV Adhikari*
    Physical Chemistry and Chemical Physics 2020

  • New cyanopyridine-based π-conjugative poly(azomethine)s: Synthesis, characterization and electroluminescence studies
    N Pilicode, P Naik, KM Nimith, M Acharya, MN Satyanarayan, AV Adhikari
    Polymers for Advanced Technologies 2020

  • Simple Thiophene Based Organic Dyes as Active Photosensitizers for DSSC Application: from Molecular Design to Structure-Property Relationship
    KS Keremane, P N, AV Adhikari*
    Journal of Nano- and Electronic Physics 12 (02), 02039-02043 2020

  • Solvent selection for highly reproducible carbon-based mixed-cation hybrid lead halide perovskite solar cells via adduct approach
    KS Keremane, S Prathapani, LJ Haur, D Bahulayan, AV Adhikari
    Solar Energy 199, 761-771 2020

  • New cyanopyridine based conjugated polymers carrying auxiliary electron donors: From molecular design to blue emissive PLEDs
    N Pilicode, P Naik, KM Nimith, M Acharya, MN Satyanarayan, AV Adhikari
    Dyes and Pigments 174, 108046 2020

  • Synthesis, characterization and electroluminescence studies of cyanopyridine-based π-conjugative polymers carrying benzo [c][1, 2, 5] thiadiazole and naphtho [1, 2-c: 5, 6-c
    N Pilicode, P Naik, M Acharya, AV Adhikari
    New Journal of Chemistry 44 (26), 10796-10805 2020

  • Asymmetric dual anchoring sensitizers/cosensitizers for dye sensitized solar cell application: an insight into various fundamental processes inside the cell
    R Kesavan, F Attia, R Su, P Anees, A El-Shafei, AV Adhikari
    The Journal of Physical Chemistry C 123 (40), 24383-24395 2019

  • Self-assembly of taper-and wedge-shaped maleimide derivatives: Synthesis and structure-property relationship
    DR Vinayakumara, S Kumar, SK Prasad, AV Adhikari
    Journal of Molecular Liquids 284, 765-772 2019

  • New blue light emitting cyanopyridine based conjugated polymers: from molecular engineering to PLED applications
    N Pilicode, M Acharya, P Naik, AV Adhikari
    Journal of Photochemistry and Photobiology A: Chemistry 378, 38-45 2019

  • Reduction of nitro compounds carrying electron withdrawing groups: A convenient approach without metal catalyst
    KA Vishnumurthy, AV Adhikari
    Chemical Data Collections 20, 100211 2019

  • Highly fluorescent materials derived from ortho-vanillin: Structural, photophysical electrochemical and theoretical studies
    S Poojary, M Acharya, AAA Salam, D Kekuda, U Nayek, SM Kumar, ...
    Journal of Molecular Liquids 275, 792-806 2019

  • Supramolecular columnar self-assembly of wedge-shaped rhodanine based dyes: Synthesis and optoelectronic properties
    DR Vinayakumara, S Kumar, AV Adhikari
    Journal of Molecular Liquids 274, 215-222 2019

  • New cyanopyridone-based unsymmetrical dyads: the effect of donor strength on their optoelectronic properties
    DR Vinayakumara, R Kesavan, S Kumar, AV Adhikari
    Photochemical & Photobiological Sciences 18 (8), 2052-2060 2019

  • Simple diphenylamine based D–π–A type sensitizers/co-sensitizers for DSSCs: a comprehensive study on the impact of anchoring groups
    R Kesavan, IM Abdellah, SP Singh, A El-Shafei, AV Adhikari
    Physical Chemistry Chemical Physics 21 (20), 10603-10613 2019

  • Columnar self-assembly of novel benzylidenehydrazones and their difluoroboron complexes: structure–property correlations
    DR Vinayakumara, K Swamynathan, S Kumar, AV Adhikari
    New Journal of Chemistry 43 (18), 7099-7108 2019

MOST CITED SCHOLAR PUBLICATIONS

  • Synthesis and antimicrobial activities of novel quinoline derivatives carrying 1, 2, 4-triazole moiety
    S Eswaran, AV Adhikari, NS Shetty
    European journal of medicinal chemistry 44 (11), 4637-4647 2009
    Citations: 293

  • Quinolin-5-ylmethylene-3-{[8-(trifluoromethyl) quinolin-4-yl] thio} propanohydrazide as an effective inhibitor of mild steel corrosion in HCl solution
    VR Saliyan, AV Adhikari
    Corrosion Science 50 (1), 55-61 2008
    Citations: 222

  • New quinoline derivatives: synthesis and investigation of antibacterial and antituberculosis properties
    S Eswaran, AV Adhikari, IH Chowdhury, NK Pal, KD Thomas
    European journal of medicinal chemistry 45 (8), 3374-3383 2010
    Citations: 186

  • Synthesis and antimicrobial activities of some novel 1, 2, 4-triazolo [3, 4-b]-1, 3, 4-thiadiazoles and 1, 2, 4-triazolo [3, 4-b]-1, 3, 4-thiadiazines carrying thioalkyl and
    T Karabasanagouda, AV Adhikari, NS Shetty
    European journal of medicinal chemistry 42 (4), 521-529 2007
    Citations: 148

  • Design, synthesis and antimicrobial activities of some new quinoline derivatives carrying 1, 2, 3-triazole moiety
    KD Thomas, AV Adhikari, NS Shetty
    European journal of medicinal chemistry 45 (9), 3803-3810 2010
    Citations: 128

  • Synthesis of some new 2-(3-methyl-7-substituted-2-oxoquinoxalinyl)-5-(aryl)-1, 3, 4-oxadiazoles as potential non-steroidal anti-inflammatory and analgesic agents
    S Wagle, AV Adhikari, NS Kumari
    CSIR 2008
    Citations: 118

  • Inhibition of corrosion of mild steel in acid media by N′-benzylidene-3-(quinolin-4-ylthio) propanohydrazide
    VR Saliyan, AV Adhikari
    Bulletin of Materials Science 31 (4), 699-711 2008
    Citations: 102

  • Design and synthesis of some new quinoline-3-carbohydrazone derivatives as potential antimycobacterial agents
    S Eswaran, AV Adhikari, NK Pal, IH Chowdhury
    Bioorganic & medicinal chemistry letters 20 (3), 1040-1044 2010
    Citations: 99

  • Synthesis of some new pyrazolines and isoxazoles carrying 4-methylthiophenyl moiety as potential analgesic and anti-inflammatory agents
    AV Adhikari
    CSIR 2009
    Citations: 97

  • New 1, 3-oxazolo [4, 5-c] quinoline derivatives: Synthesis and evaluation of antibacterial and antituberculosis properties
    S Eswaran, AV Adhikari, RA Kumar
    European journal of medicinal chemistry 45 (3), 957-966 2010
    Citations: 95

  • Design, synthesis and docking studies of new quinoline-3-carbohydrazide derivatives as antitubercular agents
    KD Thomas, AV Adhikari, S Telkar, IH Chowdhury, R Mahmood, NK Pal, ...
    European journal of medicinal chemistry 46 (11), 5283-5292 2011
    Citations: 93

  • New quinolin-4-yl-1, 2, 3-triazoles carrying amides, sulphonamides and amidopiperazines as potential antitubercular agents
    KD Thomas, AV Adhikari, IH Chowdhury, E Sumesh, NK Pal
    European journal of medicinal chemistry 46 (6), 2503-2512 2011
    Citations: 85

  • Synthesis of some new 4-styryltetrazolo [1, 5-a] quinoxaline and 1-substituted-4-styryl [1, 2, 4] triazolo [4, 3-a] quinoxaline derivatives as potent anticonvulsants
    S Wagle, AV Adhikari, NS Kumari
    European journal of medicinal chemistry 44 (3), 1135-1143 2009
    Citations: 83

  • N′-[4-(diethylamino) benzylidine]-3-{[8-(trifluoromethyl) quinolin-4-yl] thio} propano hydrazide) as an effective inhibitor of mild steel corrosion in acid media
    SV Ramesh, AV Adhikari
    Materials Chemistry and Physics 115 (2-3), 618-627 2009
    Citations: 79

  • A new class of anticonvulsants possessing 6 Hz activity: 3, 4-dialkyloxy thiophene bishydrazones
    R Kulandasamy, AV Adhikari, JP Stables
    European journal of medicinal chemistry 44 (11), 4376-4384 2009
    Citations: 76

  • Nonlinear optical and optical power limiting studies on a new thiophene-based conjugated polymer in solution and solid PMMA matrix
    P Poornesh, PK Hegde, G Umesh, MG Manjunatha, KB Manjunatha, ...
    Optics & Laser Technology 42 (1), 230-236 2010
    Citations: 71

  • Studies on third-order nonlinear optical properties and reverse saturable absorption in polythiophene/poly (methylmethacrylate) composites
    P Poornesh, G Umesh, PK Hegde, MG Manjunatha, KB Manjunatha, ...
    Applied Physics B 97 (1), 117-124 2009
    Citations: 64

  • Extraction, characterization and biological studies of phytochemicals from Mammea suriga
    MM Poojary, KA Vishnumurthy, AV Adhikari
    Journal of pharmaceutical analysis 5 (3), 182-189 2015
    Citations: 61

  • New imidazo [1, 2-a] pyridines carrying active pharmacophores: Synthesis and anticonvulsant studies
    S Ulloora, R Shabaraya, S Aamir, AV Adhikari
    Bioorganic & medicinal chemistry letters 23 (5), 1502-1506 2013
    Citations: 57

  • New carbazole based metal-free organic dyes with D-π-A-π-A architecture for DSSCs: synthesis, theoretical and cell performance studies
    P Naik, MR Elmorsy, R Su, DD Babu, A El-Shafei, AV Adhikari
    Solar Energy 153, 600-610 2017
    Citations: 53

Publications

>140 Publications, one book chapter, and 10 conference proceedings.

GRANT DETAILS

Research projects funded by DST, DRDO, DEIT completed

RESEARCH OUTPUTS (PATENTS, SOFTWARE, PUBLICATIONS, PRODUCTS)

Research outputs in terms of publications and new products development

CONSULTANCY

Industrial consultancy to solve their issues related to product's synthesis and their purification including effluent treatments

Industry, Institute, or Organisation Collaboration

MRPL-NITK interactions

SOCIAL, ECONOMIC, or ACADEMIC BENEFITS

Biofuel awareness in Dakshina Kannada district through KSBDB, KoG, Bangalore: Production and use of Biodiesel from non-edible oils and Biogas from agro- and kitchen-wastes.