ALFA SHARMA
@cet.edu.in
Assistant Professor, Department of Chemistry
Odisha University of Technology and Research
RESEARCH INTERESTS
Chemical Sensors, Modelling of Sensors, Photocatalysis, Thermodynamics and Kinetics, Materials Science, Nanotechnology
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
A. Sharma, A. Tripathi, Sree Harsha Nandam, Horst Hahn, and K. Eswar Prasad
Elsevier BV
A. Sharma, S.S. Hirmukhe, Sree Harsha Nandam, Horst Hahn, I. Singh, R. Lakshmi Narayan, and K. Eswar Prasad
Elsevier BV
Subhash Chand Yadav, Alfa Sharma, Rupesh S. Devan, and Parasharam M. Shirage
Elsevier BV
S.S. Hirmukhe, A. Sharma, Sree Harsha Nandam, Horst Hahn, K.E. Prasad, and I. Singh
Elsevier BV
A Sharma, Sree Harsha Nandam, Horst Hahn, and K. Eswar Prasad
Frontiers Media SA
In this work, the deformation behavior of as-prepared (AP) and structurally relaxed (SR) Cu–Zr–based nanoglasses (NGs) are investigated using nano- and micro-indentation. The NGs are subjected to structural relaxation by annealing them close to the glass transition temperature without altering their amorphous nature. The indentation load, p, vs. displacement, h, curves of SR samples are characterized by discrete displacement bursts, while the AP samples do not show any of them, suggesting that annealing has caused a local change in the amorphous structure. In both the samples, hardness (at nano- and micro-indentation) decreases with increasing p, demonstrating the indentation size effect. The micro-indentation imprints of SR NGs show evidence of shear bands at the periphery, indicating a heterogeneous plastic flow, while AP NG does not display any shear bands. Interestingly, the shear band density decreases with p, highlighting the fact that plastic strain is accommodated entirely by the shear bands in the subsurface deformation zone. The results are explained by the differences in the amorphous structure of the two NGs.
Parameshwar R. Chikate, Alfa Sharma, Sachin R. Rondiya, Russell W. Cross, Nelson Y. Dzade, Parasharam M. Shirage, and Rupesh S. Devan
Royal Society of Chemistry (RSC)
The larger surface area and increased point contacts of hierarchically arranged ZnO nanowires (upper panel) offered more potential barriers for the gas molecule exhibiting binding strength CO < C2H5OH < NH3 (lower panel) and provided excellent gas-sensing performance at 100 °C for NH3 gas.
A. Sharma, Sree Harsha Nandam, Horst Hahn, and K. Eswar Prasad
Elsevier BV
Yogendra Kumar, Alfa Sharma, Kushal Mazumder, and Parasharam M. Shirage
AIP Publishing
Alfa Sharma, Kushal Mazumder, Yogendra Kumar, and Parasharam M. Shirage
AIP Publishing
Kushal Mazumder, Alfa Sharma, Yogendra Kumar, and Parasharam M. Shirage
AIP Publishing
Yogendra Kumar, Alfa Sharma, and Parasharam M. Shirage
Elsevier BV
Alfa Sharma, Yogendra Kumar, and Parasharam M. Shirage
Springer Science and Business Media LLC
Gowthamaraju Shanmugam, U. P. Deshpande, Alfa Sharma, P. M. Shirage, and P. A. Bhobe
American Chemical Society (ACS)
Nanostructured SnSe samples with specific morphologies like rods, rod-flowers, flakes, and flake-flowers were synthesized using the same reactants but with a control over various growth parameters involved in a hydrothermal reaction process. The morphology and detailed microstructure of the obtained samples have been studied by means of field-emission scanning electron microscopy (FE SEM) and high resolution transmission electron microscopy (HR-TEM). The sample quality, homogeneity, and phase purity have been thoroughly studied by selective area electron diffraction (SAED) and X-ray diffraction (XRD) analysis. Crystal structure study by refinement of powder XRD profiles using the least-squares fitting strategy indicates all samples to be pure single phase and provides its lattice parameters. The impact of changing morphology on the electrical, optical, and sensing properties of SnSe has been systematically evaluated. Temperature dependent electrical transport measurements highlight the increasingly 2D nat...
Alfa Sharma, Yogendra Kumar, and Parasharam M. Shirage
Author(s)
Kushal Mazumder, Alfa Sharma, Yogendra Kumar, and Parasharam M. Shirage
Royal Society of Chemistry (RSC)
Adsorption isotherm models confirm the effect of Cu intercalation on humidity sensing properties of topological insulator Bi2Se3 single crystals.
Yogendra Kumar, Alfa Sharma, Md. A. Ahmed, Sawanta S. Mali, Chang Kook Hong, and Parasharam M. Shirage
Royal Society of Chemistry (RSC)
The (BH)max value of 2.41 MGOe at room temperature confirmed the capabilities of CoFe2O4 NPs in permanent magnets for current technological applications.
Kushal Mazumder, Alfa Sharma, Yogendra Kumar, Prashant Bankar, Mahendra A. More, Rupesh Devan, and Parasharam M. Shirage
Royal Society of Chemistry (RSC)
Nanostructures of bismuth selenide (Bi2Se3), a 3D topological insulator material, and nickel (Ni) doped Bi2Se3 samples were prepared by a hydrothermal method to explore the field emission properties.
Alfa Sharma, Yogendra Kumar, Kushal Mazumder, Amit Kumar Rana, and Parasharam M. Shirage
Royal Society of Chemistry (RSC)
A Freundlich adsorption isotherm model confirms a plausible humidity sensing mechanism when using wet chemically prepared Zn1−xNixO nanostructures.
Manojit Pusty, Alfa Sharma, Lichchhavi Sinha, Anjali Chaudhary, and Parasharam Shirage
Wiley
In this research paper we present a comparative study on the enhanced piezoelectric performance between Carbon Nanotubes (CNT)/PVDF nanocomposite as well as Iron-Reduced Graphene Oxide (Fe-RGO)/PVDF nanocomposite. The enhanced performance is realized by a unique device structure, in which the bottom electrode is physically not in contact with the piezoelectric film until external excitation is applied. FTIR characterization shows the enhancement of polar crystallization phases due to electrostatic interactions in PVDF by the addition of CNT and Fe-RGO. Raman Spectroscopy indicates the formation of good quality Fe-RGO nanosheets and also shows high crystalline quality of CNTs. Raman Spectroscopy identifies the interaction between CNTs and Fe-RGO nanosheets with the polymer that supports the piezoelectric current generation mechanism. Conductivity measurements show that addition of CNT and Fe-RGO in PVDF increases the conductivity of the nanocomposite films. The CNT/PVDF and Fe-RGO/PVDF piezoelectric energy harvesting device produced an open circuit output voltage of 2.5 V and 1.2 V respectively. A short circuit rectified current of nearly 700 nA and 300 nA was detected by the CNT/PVDF and Fe-RGO/PVDF based piezoelectric energy harvesting device.
Alfa Sharma, Prateek Bhojane, Amit Kumar Rana, Yogendra Kumar, and Parasharam M. Shirage
Elsevier BV
Yogendra Kumar, Alfa Sharma, and Parasharam M. Shirage
Royal Society of Chemistry (RSC)
The humidity sensing performance of cobalt ferrite nanoparticles (CoFe2O4 NPs) with controlled morphology obtained via a solution route is reported in this work.
Prateek Bhojane, Alfa Sharma, Manojit Pusty, Yogendra Kumar, Somaditya Sen, and Parasharam Shirage
American Scientific Publishers
In this work, we report a low cost, facile synthesis method for Nickel ferrite (NiFe₂O₄) nanostructures obtained by chemical bath deposition method for alternate transition metal oxide electrode material as a solution for clean energy. We developed a template free ammonia assisted method for obtaining porous structure which offering better supercapacitive performance of NiFe₂O₄ electrode material than previously reported for pure NiFe₂O₄. Here we explore the physical characterizations X-ray diffraction, FESEM, HRTEM performed to under-stand its crystal structure and morphology as well as the electrochemical measurements was performed to understand the electrochemical behaviour of the material. Here ammonia plays an important role in governing the structure/morphology of the material and enhances the electrochemical performance. The specific capacitance of 541 Fg⁻¹ is achieved at 2 mVs⁻¹ scan rate which is highest for the pure NiFe₂O₄ electrode material without using any addition of carbon based material, heterostructure or template based method.