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RISS 인기검색어
- 검색키워드
- 저자 : T. Subbaiah (검색결과 5 건)
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A Facile and TGA Free Hydrothermal Synthesis of SnS Nanoparticles
Y. P. Venkata Subbaiah,Narayana Thota,M. Raghavender,Y. P. Venkata Subbaiah,G. Hema Chandra,K.T. Ramakrishna Reddy 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.10
"In this paper, we employed a simple and cost-effective thioglycolic acid (TGA) free hydrothermal method, based on thiourea hydrolysis of stannous chloride dihydrate [SnCl2 · 2H2O] at 160 ℃ – 190 ℃ for 6 h, for the synthesis of SnS nanoparticles. The effect of hydrothermal autoclave reaction temperature on various properties of SnS nanoparticles have been examined at length using X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy attached with EDAX (FE-SEM), transmission electron microscopy (TEM) and ultraviolet-visible (UV-Vis) spectroscopy. The results suggest that the crystallization of orthorhombic SnS nanoparticles, with size varying from 3 nm to 5 nm, formed at RT = 160 ℃. Further, the formation of SnS phase was confirmed by an IR Sn-S characteristic bands around 2350 cm -1, 1041 cm -1 and 570 cm -1, and four distinguished Raman peaks at 95 cm -1, 160 cm -1, 189 cm -1 and 220 cm -1. The mechanism for the formation of SnS nanoparticles have been proposed and discussed. The SnS nanoparticles have exhibited reaction temperature dependent morphological features like nanoflowers, nanoflakes, spherical nanoparticles and nanogranules. The absorbance studies indicated both strong direct and weak indirect allowed transitions for SnS nanoparticles and the associated band gaps were found to be 1.5 eV and 1.19 eV, respectively. The dual band gap combination of SnS would favor strong direct absorption of carriers and improved minority carrier life time due to indirect nature, which means the grown particles are suitable for ideal absorber material for solar cell applications. "
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Ligand mediated eco-friendly leaching of zinc from spent catalyst in alkaline media
M. Mohapatra,Banaja Nayak,K. Sanjay,T. Subbaiah,B.K. Mishra 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A novel leaching process for recovering Zn from spent catalyst in alkaline solution has been discussed. The catalyst was characterized for physico-chemical properties by chemical, XRD, TG-DTA and SEM. More than 92% Zn could be extracted from spent catalyst under the conditions: pulp density 2.5% (w/v), NaOH 1 M, EDTA 0.025 M, temperature 80℃ and time 3 h. Zn extraction increased with the number of stages. At the 4th stage almost all Zn could be extracted. A tentative process flow-sheet has been proposed based on Zn recovery. Characterization of leach residue by XRD and SEM gave an insight into the mechanism.
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Preparation and characterization of sprayed In<sub>2</sub>O<sub>3</sub>:Mo films
Prathap, P.,Gowri Devi, G.,Subbaiah, Y. P. V.,Ganesan, V.,Ramakrishna Reddy, K. T.,Yi, J. WILEY-VCH Verlag 2008 Physica status solidi. PSS. A, Applications and ma Vol.205 No.8
<P>Transparent conducting oxides (TCO) play a major role in the area of thin film photovoltaics, flat panel displays, organic light emitting diodes and other optoelectronic devices. In order to improve the performance of a device, the TCO should have good optical transmittance as well as conductivity. In the present study, In<SUB>2</SUB>O<SUB>3</SUB>:Mo films have been grown by an economic and simple spray pyrolysis method with different molybdenum doping concentrations that vary in the range, 0–12 at% at a substrate temperature of 400 °C. The structural and morphological, electrical and optical behaviour of the as-grown layers were studied. All the deposited layers showed a body-centered cubic structure with a strong (222) orientation. In<SUB>2</SUB>O<SUB>3</SUB>:Mo films grown with Mo-concentration of 6.0 at% had the maximum grain size of 90 nm. The average optical transmittance of the films was >85% in the visible region. The change of grain size, electrical resistivity, carrier mobility and density, optical band gap and figure of merit with doping concentration was reported and discussed. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
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Growth and characterization of indium oxide films
P. Prathap,G. Gowri Devi,Y.P.V. Subbaiah,K.T. Ramakrishna Reddy,V. Ganesan 한국물리학회 2008 Current Applied Physics Vol.8 No.2
In2O3 250450.C. The structural and morphological properties of the as-deposited lms were studied using X-ray diractometer and scanningelectron microscope as well as atomic force microscope, respectively. The lms formed at a temperature of 400.C showed body-centeredcubic structure with a strong (22) orientation. The structural parameters such as the crystallite size, lattice strain and texture coecientof the lms were also calculated. The lms deposited at a temperature of 400.C showed an optical transmittance of >85% in the visibleregion. The change of resistivity, mobility, carrier concentration and activation energies with the deposition temperature was studied.The highest gure of merit for the layers grown at 400℃ was 1.09x10-³Ω-¹.
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N. K. Sahu,Barsha Dash,Suchismita Sahu,I. N. Bhattacharya,T. Subbaiah 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.11
The paper deals with the extraction of copper from the deposited material of the liner of the electrostatic precipitator (ESP) of the copper smelter plant. These precipitates of ESP liner (ESP dust) generally contain mixed phases of copper and arsenic. An attempt is made to extract copper from ESP dust, subsequently removing arsenic from the leach liquor. The ESP dust containing paramelaconite (6CuO·Cu2O), α-domeykite (Cu3As), metadomeykite (Cu3As),enargite (Cu3AsS4) and (Cu,Fe) SO4·H2O is not a naturally occurring geological mineral; thus comparatively high acid concentration and temperature are required to break the matrix of this mixed material so as to liberate the content. The leaching efficiency of copper was 97% at 97 oC. The acid concentration of 1.5M and pulp density of 20% was found to be optimum. The removal of arsenic as ferric arsenate was carried out in two stages: increasing the pH and precipitation of arsenic by adjusting pH of the solution and by adding ferrous sulfate and hydrogen peroxide. The optimum removal of arsenic was 95% when pH was raised to 2.35 followed by precipitation. The key progression of the process is the recovery of copper from ESP dust as well as removal of arsenic from the leach liquor.
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