Institution
Motilal Nehru National Institute of Technology Allahabad
Education•Allahabad, Uttar Pradesh, India•
About: Motilal Nehru National Institute of Technology Allahabad is a education organization based out in Allahabad, Uttar Pradesh, India. It is known for research contribution in the topics: Control theory & Electric power system. The organization has 2475 authors who have published 5067 publications receiving 61891 citations. The organization is also known as: NIT Allahabad & Motilal Nehru Regional Engineering College.
Papers published on a yearly basis
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TL;DR: In this paper, the authors reported a simultaneous improvement in both optical and electrical properties of indium oxide thin film due to the doping of Sn ions and showed that Sn-doped In2O3 thin film can be a potential candidate for use in various optoelectronic devices.
Abstract: Undoped and Sn-doped (1, 1.5 and 2 at.%) indium oxide (In2O3) thin films have been grown by the chemical spray pyrolysis technique on cleaned glass substrates using indium nitrate [In(NO3)3] and stannic tetrachloride hydrated (SnCl4·5H2O) as the host and dopant precursors, respectively, and deionized water as the solvent. Structural characterization using x-ray diffraction reveals that the films possess cubic structure, with the average crystallite size in the range 10-14 nm. The surface morphology and roughness of the films have been investigated by means of an atomic force microscope. UV-Vis measurements indicate an enhancement in the optical transmittance in the visible region on Sn doping. Further, the doping effect has been found to substantially reduce the electrical resistance to a few orders of magnitude of the undoped In2O3 film. We report a simultaneous improvement in both the optical and electrical properties of indium oxide thin film due to the doping of Sn ions. These results indicate that Sn-doped In2O3 thin film can be a potential candidate for use in various optoelectronic devices. Among all the films examined, the 1 at.% Sn-doped film shows the maximum response (~91%) at 300 °C for 80 ppm concentration of formaldehyde in air.
25 citations
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TL;DR: In this paper, the authors used X-ray diffraction and optical spectroscopy to characterize Europium-doped Y 2 O 3 nanoparticles using an yttrium oxo-isopropoxide (Y 5 O(OPr i ) 13 ) as precursor.
25 citations
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TL;DR: In this paper, a surface plasmon resonance based D-shaped photonic crystal fiber (PCF) refractive index (RI) sensor was proposed for the detection of biomedical/biochemical analytes within the different analyte refractive indices ranging from 1.33 to 1.40.
Abstract: We propose a surface plasmon resonance based D-shaped photonic crystal fiber (PCF) refractive index (RI) sensor in visible to near-infrared spectrum. It is suitable for the detection of biomedical/biochemical analytes within the different analyte refractive indices ranging from 1.33 to 1.40. Gold is used as an active metal deposited on the partially removed cladding of the D-shaped PCF. Subsequently, a thin layer of molybdenum disulfide (MoS2) is deposited on the gold because it supports intensive confinement of plasmon polaritons with low loss. Further, a flake of graphene is deposited on MoS2 layer as it provides oxidation resistance to gold and MoS2 layers. MoS2 improves the sensing characteristics of the proposed D-shaped PCF due to its high surface adsorption efficiency and excellent band gap tunability. Moreover, the structure parameter such as the diameter of the largest air hole and the thickness of gold, graphene and MoS2 layer is varied to observe its effect on sensing performance of the proposed PCF. The simulation result showed that the sensitivity was improved and reached to 14,933.34 nm/RIU (refractive index unit) with a high figure of merit and an effective RI resolution of 401.05 RIU−1 and $$6.69\times {10}^{-6}$$ RIU, respectively. With such sensing characteristics, our proposed sensor can be a potential candidate in plasmonic sensors.
25 citations
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TL;DR: In this paper, the potential of cassava peel and rubber tree bark for the removal of Cr (VI) from aqueous solution was investigated by comparing popular isotherm models and kinetic models for evaluating the kinetics of mass transfer.
Abstract: Present study investigates the potential of cassava peel and rubber tree bark for the removal of Cr (VI) from aqueous solution. Removal efficiency of more than 99% was obtained during the kinetic adsorption experiments with dosage of 3.5 g/L for cassava peel and 8 g/L for rubber tree bark. By comparing popular isotherm models and kinetic models for evaluating the kinetics of mass transfer, it was observed that Redlich-Peterson model and Langmuir model fitted well (R2 > 0.99) resulting in maximum adsorption capacity as 79.37 mg/g and 43.86 mg/g for cassava peel and rubber tree bark respectively. Validation of pseudo-second order model and Elovich model indicated the possibility of chemisorption being the rate limiting step. The multi-linearity in the diffusion model was further addressed using multi-sites models (two-site series interface (TSSI) and two-site parallel interface (TSPI) models). Considering the influence of interface properties on the kinetic nature of sorption, TSSI model resulted in low mass transfer rate (5% for cassava peel and 10% for rubber tree bark) compared to TSPI model. The study highlights the employability of two-site sorption model for simultaneous representation of different stages of kinetic sorption for finding the rate-limiting process, compared to the separate equilibrium and kinetic modeling attempts.
25 citations
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TL;DR: In this paper, the effects of Cr doping on Raman, optical band gap and magnetic properties of SnO2 nanoparticles were investigated, and it was shown that with the doping of Cr in SnO 2, band gap increases due to the decrease in particle size and absorption spectra showed two peaks at 340 and 454 nm.
Abstract: Pure and Cr (1, 3, 5, 7 and 10 at.%) doped SnO2 nanoparticles were synthesized in aqueous solution by a low cost chemical co-precipitation method without using any stabilizing agent. The effects of Cr doping on Raman, optical band gap and magnetic properties of SnO2 nanoparticles were investigated. Particle size is found to decrease with Cr doping into the SnO2 matrix which was confirmed by TEM. Besides of the fundamental mode of vibration, two additional peaks are also observed in Raman spectra which are correlated to Cr. The absorption spectra showed two peaks at 340 and 454 nm. The absorbance peak at 340 nm is assigned to the transition from valence band (VB) to conduction band (CB) and the peak at 454 nm was due to the transition from VB to mid gap energy level introduced by Cr. The optical band gap of undoped SnO2 nanoparticles is calculated to be 3 eV. With the doping of Cr in SnO2, band gap increases due to the decrease in particle size. The emission intensity is found to decrease with the increase in Cr doping due to the emission from CB to mid gap energy levels introduced by Cr between CB and VB. Undoped SnO2 nanoparticles show room temperature ferromagnetism due to the presence of defects and oxygen vacancies. The heavily doped SnO2 nanoparticles show paramagnetic nature due to the antiferromagnetic coupling between Cr and its nearest neighbour.
25 citations
Authors
Showing all 2547 results
Name | H-index | Papers | Citations |
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Santosh Kumar | 80 | 1196 | 29391 |
Anoop Misra | 70 | 385 | 17301 |
Naresh Kumar | 66 | 1106 | 20786 |
Munindar P. Singh | 62 | 580 | 20279 |
Arvind Agarwal | 58 | 325 | 12365 |
Mahendra Kumar | 54 | 216 | 9170 |
Jay Singh | 51 | 301 | 8655 |
Lalit Kumar | 47 | 381 | 11014 |
O.N. Srivastava | 47 | 548 | 10308 |
Avinash C. Pandey | 45 | 301 | 7576 |
Sunil Gupta | 43 | 518 | 8827 |
Rakesh Mishra | 41 | 545 | 7385 |
Durgesh Kumar Tripathi | 37 | 133 | 5937 |
Vandana Singh | 35 | 190 | 4347 |
Prashant K. Sharma | 34 | 174 | 3662 |