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Professor, Yenepoya Research Centre, Yenepoya University
Yenepoya deemed to be University
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.
M.Sc. (Organic Chemistry, Mysore University), Ph.D. (Organic Chemistry Karnatak University)
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)
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.
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.
NMR-based studies on metabolites in combination with LCMS tool: Characterization of various metabolites in biosamples.
Kavya S. Keremane, Yann Pellegrin, Aurélien Planchat, Denis Jacquemin, Fabrice Odobel, and Airody Vasudeva Adhikari
Journal of Physical Chemistry C, ISSN: 19327447, eISSN: 19327455, Volume: 126, Pages: 12383-12390, Published: 4 August 2022 American Chemical Society (ACS)
Kavya S. Keremane, Rathnamala Rao, and Airody Vasudeva Adhikari
Photochemistry and Photobiology, ISSN: 00318655, eISSN: 17511097, Pages: 289-300, Published: March/April 2021 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.
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, Pages: 249-258, Published: 25 January 2021 American Chemical Society (ACS)
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
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.
K. A. Vishnumurthy, K. H. Girish, and A. V. Adhikari
SN Applied Sciences, eISSN: 25233971, Published: October 2020 Springer Science and Business Media LLC
Naveenchandra Pilicode, Praveen Naik, and Airody Vasudeva Adhikari
Polymer Engineering and Science, ISSN: 00323888, eISSN: 15482634, Pages: 2550-2559, Published: 1 October 2020 Wiley
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.
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).
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.
Kavya S. Keremane, , Praveen Naik, Airody Vasudeva Adhikari, , and
Journal of Nano- and Electronic Physics, ISSN: 20776772, eISSN: 23064277, Published: 2020 Sumy State University
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...
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.
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.
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.
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.
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.
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.
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.
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.
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.
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
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.
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.
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.
>140 Publications, one book chapter, and 10 conference proceedings.
Research projects funded by DST, DRDO, DEIT completed
Research outputs in terms of publications and new products development
Industrial consultancy to solve their issues related to product's synthesis and their purification including effluent treatments
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.