adhish jaiswal
@igntu.ac.in
assistant professor
Indira Gandhi National Tribal University
RESEARCH INTERESTS
nanomaterial chemistry and its application
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Arati Dubey, Sajiya Iraqui, Avanish Shukla, Adhish Jaiswal, Indra Bahadur, and Faruq Mohammad
Elsevier BV
Sajiya Iraqui, Arati Dubey, Irudhayaraj Savarimuthu, Ajay Shankar, Adhish Jaiswal, Indra Bahadur, Imran Uddin, and Faruq Mohammad
Elsevier BV
Sajiya Iraqui, Arati Dubey, Irudhayaraj Savarimuthu, Ajay Shankar, Adhish Jaiswal, Indra Bahadur, Imran Uddin, and Faruq Mohammad
Elsevier BV
Aarti Saini, Kisturi Dhanwant, Khemchand Dewangan, Ramalingam Thirumoorthi, Adhish Jaiswal, Indra Bahadur, Faruq Mohammad, and Ahmed Abdullah Soleiman
Elsevier BV
Khemchand Dewangan, Dadan Singh, Nilesh Satpute, Ritika Singh, Adhish Jaiswal, Kamlesh Shrivas, and Indra Bahadur
Elsevier BV
S. Irudhaya Raj and Adhish Jaiswal
Elsevier BV
Sumaiya Bano, S. Irudhaya Raj, Ahmad Khalilullah, Adhish Jaiswal, and Imran Uddin
Elsevier BV
Abstract Room temperature nanoscale cation exchange reactions (CER), acts as a versatile tool and alternative to the tedious traditional approaches for colorimetric detection of heavy metal ions in water samples. Herein, we report selective and sensitive CER in aqueous starch capped ZnS nanoparticle (NPs) as colorimetric sensor for detection and estimation of Pb2+, Cu2+ and Hg2+ and their corresponding transformed products in water samples. Other heavy metal ions such as Sn2+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+ and Cd2+ do not involve in CER. The sensor shows time dependent multiple signals, namely, composition, band gap and colour to identify corresponding metals. The partially transformed products Zn1−x,PbxS, Zn1−xCuxS and Zn1−xHgxS were instantaneously identifiable due to orange, pale brown and pale yellow coloration in presence of respective metal ions and from their spectroscopic data. The completely transformed products PbS, CuxS and HgS were again identifiable with different colour such as brown, pale brown and bright yellow coloration, respectively. Due to favorable room temperature nanoscale CER, the proposed ZnS NPs based method has potential applications in monitoring qualitative and quantitative tracing of Pb2+, Cu2+ and Hg2+ in various real water samples without using any instruments.
S. Irudhaya Raj, Adhish Jaiswal, and Imran Uddin
Royal Society of Chemistry (RSC)
Colorimetric response of CuS QDs with mercury ions.
S. Irudhaya Raj, Adhish Jaiswal, and Imran Uddin
Royal Society of Chemistry (RSC)
Adsorption of cationic and anionic dyes (A) MO, (B) BCG, (C) RB, and (D) MB by optimized calcined porous silica nanoparticles.
Irudhaya Raj, Namrata Singh, Shruti Sonter, Dadan Singh, Khemchand Dewangan, Prashant K. Singh, and Adhish Jaiswal
American Scientific Publishers
Subha Sadhu, Adhish Jaiswal, Suguna Adyanthaya, and Pankaj Poddar
Royal Society of Chemistry (RSC)
The fabrication of one-dimensional (1D) rods or wires of titania in desired crystalline facets is quite exciting due to unique optoelectronic properties. The single crystalline, oriented nanorods directly grown on transparent conducting oxide (TCO) substrates are finding a lot of interest in solar photovoltaics and several other optoelectronic devices due to enhanced electron transport and lower exciton recombination rates. However, the growth of desired crystalline facets of highly oriented, single crystalline nanorods on different substrates and understanding the interplay between the surface chemistry and growth mechanism still remain a non-trivial and challenging task. Here, for the first time, the kinetically controlled growth of the (310) facet of TiO2 nanorods on fluorine-doped tin oxide (FTO) coated glass substrate has been reported which is in contrast to the previously reported (002) faceted TiO2 nanorods. In addition to this, the growth of (110) facet TiO2 nanorods using amorphous fluorine doped silicon oxide (FSO) as a substrate is also demonstrated. In this paper, it is shown that two different faceted TiO2 nanorods can be synthesized following same synthetic condition by varying only the material properties of the substrate. To investigate the role of substrate chemistry on the morphology and single crystallinity of TiO2 nanorods, electron microscopy, XPS and contact angle measurements have been done. The results clearly indicate an important link between the surface chemistry and morphology of TiO2 nanorods. It can be assumed that there is a role of OH− and water groups which are responsible for the growth of plane (110) which has less surface energy. The observation of (310) facet is quite surprising and can be explained based on FTO crystallinity. It is possible to tune the diameter of the titania nanorods by further coating the FTO substrate with a thin gold layer due to increase in the hydrophilicity of the substrate. Finally, a light to electricity conversion efficiency of 2.5% could be achieved by using vertically grown titania nanorods on FTO as the photoanode in a dye sensitized solar cell (DSSC).
Raja Das, Adhish Jaiswal, and Pankaj Poddar
IOP Publishing
Single-phase orthorhombic DyMnO3 and GdMnO3 nanoparticles in the size range 60–70 and 35–45 nm, respectively, were synthesized using a modified hydrothermal method. The magnetic property measurements of DyMnO3 nanocrystals show anomalies around ~43 K (antiferromagnetic (AFM) coupling between Mn3+ spins) and at 7 K in the form of a peak in the zero-field-cooled curve (AFM coupling between Dy3+ spins). Whereas, GdMnO3 undergoes a phase transition at ~42 K from paramagnetic to an incommensurate-antiferromagnetic phase (ICAFM) followed by a second anomaly at ~22 K, which could be associated with the transition from ICAFM into a canted A-type AFM ordering of the Mn3+ spins. This transition is followed by a long-range ordering of the Gd3+ moments at 6 K yielding the canting of the Gd3+ spins with a ferromagnetic (FM) component antiparallel to the FM moment of the canted Mn3+ spins. No anomaly near the Neel temperature of the Mn moments for both DyMnO3 and GdMnO3 nanoparticles was observed in ac magnetization which were observed in dc magnetization. The room temperature Raman spectra of DyMnO3 shows two most intense Raman modes at 480 and 609 cm−1 which can be assigned to an antisymmetric Jahn–Teller stretching mode and a symmetric or breathing stretching mode, respectively, involving Mn–O bond stretching.
Adhish Jaiswal, Raja Das, Tuhin Maity, and Pankaj Poddar
AIP Publishing
We report the temperature and frequency dependent dielectric measurements and ac magnetic susceptibility of chemically synthesized DyFeO3 nanoparticles (size ∼50–60 nm). The measurement of the dielectric properties was carried out in a broad temperature (20–325 K) and frequency (1–106 Hz) range. The non-Debye type dipolar relaxation phenomenon was observed in the DyFeO3 nanoparticles, as confirmed by the Cole–Cole plots. The higher values of ɛ′ at the lower frequencies are explained on the basis of the Maxwell–Wagner model. The Cole–Cole analysis enabled us to separate the contribution of relaxation times, resistance and capacitance in grain and grain boundaries in DyFeO3 nanocrystals. We found that with increasing temperature, the contribution of grain boundary resistance increases in comparison to the grain resistance. We also performed spin relaxation studies in a broad temperature and frequency range. Both the in-phase (χ′) and out-of-phase (χ″) components of the ac magnetic susceptibilities of the Dy...
Raja Das, Adhish Jaiswal, Suguna Adyanthaya, and Pankaj Poddar
AIP Publishing
Interest has grown to study TbMnO3 as it was recently reported to show a gigantic magnetoelectric effect. Here, we report the synthesis and detailed magnetic and Raman spectroscopy study on TbMnO3 particles of size ∼25 nm and 2–3 μm, respectively. The incommensurate–commensurate (lock-in) transition, usually observed at 27 K for bulk phase of TbMnO3 was not observed in susceptibility versus T curve but was seen at 30 K in the coercivity versus T curve in ∼25 nm particles. This transition, which is due to the spin modulation length scale, gets weakened in nanosize due to the increased intrinsic lattice strain observed in 2–3 μm particles, due to the effect of increased particle size. The increased value of magnetization in the 2–3 μm sample was attributed to double exchange interactions between Mn+3 and Mn+4 spins. The role of annealing related effects on the fate of the Neel temperature for TbMnO3 was investigated. Raman spectroscopy indicated a decrease in the lattice distortion for ∼25 nm particles.
Adhish Jaiswal, Raja Das, Suguna Adyanthaya, and Pankaj Poddar
Springer Science and Business Media LLC
Here we report for the first time, a detailed synthesis mechanism of GdCrO3 nanoparticles using a surfactant-less hydrothermal method. We also report a detailed study of their structural and optical properties. The selected area electron diffraction and powder X-ray diffraction studies of GdCrO3 nanoparticles show pure phase and excellent crystallinity with average particle size around 50–60 nm. The structural analysis indicates a distorted perovskite crystal structure with lattice parameter values of a = 5.3099 ± 0.0022, b = 5.51793 ± 0.00226, and c = 7.60426 ± 0.00315 Å. For the first time, we report the room temperature UV–vis, photoluminescence, FTIR, and X-ray photoelectron spectroscopy results and their detailed analysis for GdCrO3. These results provide optical signatures of the formation of GdCrO3 where both Gd3+ and Cr3+ play dominant role in different frequency regions.
Adhish Jaiswal, Raja Das, Suguna Adyanthaya, and Pankaj Poddar
American Chemical Society (ACS)
A giant linear magnetoelectric effect was observed by Y. Tokura’s group recently in multiferroic DyFeO3, which demands a detailed investigation of its magnetic properties. Additionally, there is little information on the changes of chemical and physical properties of these materials with the reduction in particle size in spite of the potential applications of these materials in nanoscale devices. As the wet-chemical synthesis of these materials in nanosize and getting a control over crystallinity and stoichiometry is nontrivial and poses a serious challenge prohibiting the study of their size-dependent properties. Here, we report the synthesis of DyFeO3 nanoparticles using a surfactantless hydrothermal method with a detailed magnetic property measurement. The as-synthesized DyFeO3 nanoparticles showed excellent crystallinity with average particle size in the range 50−60 nm. The structural analysis indicated that they are of a distorted orthorhombic pervoskite crystal structure. Detailed dc magnetization m...
Adhish Jaiswal, Raja Das, Tuhin Maity, K. Vivekanand, Suguna Adyanthaya, and Pankaj Poddar
American Chemical Society (ACS)
We report the temperature-dependent Raman and dielectric spectroscopy of chemically synthesized BiFeO3 nanoparticles (average size ∼50−60 nm). The Raman spectra (90−700 K) show two sets of transitions in the lowest Raman E mode, associated with Bi−O bond motion situated in close proximity to the spin reorientation transitions reported for BiFeO3, thereby indicating the existence of possible coupling between magnons and phonons for particle size below the helical order parameter (62 nm). These transitions are slightly shifted in temperature in comparison to the bulk single crystals. We also observe a step-like behavior in Raman peak position around the Neel temperature, suggesting that the phonons are influenced by the magnetic ordering in nanosized BiFeO3. The heat-flow measurements show two sharp endothermic peaks at 1094 and 1223 K representing rhombohedral to orthorhombic or monoclinic transition followed by transition into the cubic phase above 1200 K. The low temperature (20−325 K), frequency-depende...
Raja Das, Adhish Jaiswal, Suguna Adyanthaya, and Pankaj Poddar
American Chemical Society (ACS)
Rare earth manganites crystallize in distorted orthorhombic perovskite or hexagonal structures and exhibit quite interesting optical and magnetic properties dictated by the size of the rare earth ion. Many of these materials might exhibit both ferroelectric and magnetic ordering as well as magnetoelectric coupling. However, their physical properties at reduced particle sizes remain underexplored due to the challenges associated with their synthesis with a proper control over the crystalline phase. Here, we report the wet-chemical synthesis of the hexagonal phase of nanocrystalline LuMnO3 with an average crystallite size of ∼32 nm. The room-temperature Raman spectroscopy data are consistent with the calculated values of isomorphous hexagonal RMnO3 (R = rare earth atom) compounds with P63cm symmetry. The UV−vis-NIR spectra recorded in the diffused reflectance mode at room temperature show electronic transitions at 1.7 eV (729 nm), 2.3 eV (539 nm), and 5 eV (258 nm). The magnetization measurements show that ...
Adhish Jaiswal, Raja Das, K. Vivekanand, Priya Mary Abraham, Suguna Adyanthaya, and Pankaj Poddar
American Chemical Society (ACS)
Here, we report the effect of reduction in particle size on the temperature dependent magnetization of chemically synthesized BiFeO3 nanocrystals with average grain size of 55 nm. The X-ray photoelectron spectroscopy results show a significant broadening of binding energy peaks associated to Fe3+ 2p3/2 core levels due to the reduced size. Additionally, due to the nanosize effect, the M-H loops show a significant coercivity starting from 390 K with an anomaly located in the vicinity of 150 K in our Hc vs T as well as Mr/Ms(50 kOe) vs T curves. At this temperature, both Hc and Mr/Ms(50 kOe) undergo minima. Additionally, our results for the first time show the evidence of existence of a low temperature anomaly due to spin-glass transition in the range from 40−44 K in the field cooled magnetization curves. In bulk single crystals, this transition is reported to be situated at around 50 K, however, this transition remained so far undiscovered in the recent studies on BiFeO3 nanoparticles due to the insufficien...
Adhish Jaiswal, Raja Das, K. Vivekanand, Tuhin Maity, Priya Mary Abraham, Suguna Adyanthaya, and Pankaj Poddar
AIP Publishing
The rare earth orthochromites are extremely interesting due to the richness of their optical, dielectric, and magnetic properties as well as due to their multiferroic properties which make them suitable materials to study in the nanoregime. However, the wet-chemical synthesis of these materials in nanosize is nontrivial. Here, we report for the first time, the detailed Raman spectra as well as magnetic and dielectric properties of chemically synthesized GdCrO3 nanoparticles of size ranging from 40 to 60 nm. The magnetic properties are dictated by competing Cr3+–Cr3+, Gd3+–Cr3+, and Gd3+–Gd3+ superexchange interactions in different temperature regions, resulting into an antiferromagnetic ordering at 167 K due to the Cr3+–Cr3+ followed by weak ferromagnetic ordering due to the onset of Cr3+–Gd3+ interactions. At lower temperature, it shows weak antiferromagnetic ordering due to Gd3+–Gd3+ interaction. Below 95 K, GdCrO3 nanoparticles showed the presence of negative magnetization due to Gd3+ and Cr3+ interact...