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Kang, S.J.,Baik, J.Y.,Thakur, A.,Kim, H.D.,Shin, H.J.,Chung, J.,Lee, J.,Lee, J. North Holland ; Elsevier Science Ltd 2011 Chemical physics letters Vol.510 No.4
The photoelectron spectral features and corresponding energy band diagrams of amorphous indium gallium zinc oxide (a-IGZO) thin films were investigated for different surface chemistries. Cleaned-IGZO surface had a deep subgap state (DSS), the binding energy (BE) of which expanded to ∼1.5eV. When stored in air, IGZO surface became contaminant passivated and DSS became negligible. Sputtering resulted in phase separation of surface into metallic In and lesser In and Zn containing IGZO. Compared with IGZO, the air-passivated surface and phase-separated surface, respectively, had a more weakly conducting environment and a higher BE spectral shift.
Thakur, A.K.,Nisola, G.M.,Limjuco, L.A.,Parohinog, K.J.,Torrejos, R.E.C.,Shahi, V.K.,Chung, W.J. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.49 No.-
<P>Nano-spherical amine-rich polyethylenimine (PEI) grafted on mesoporous silica (MCM-41) (PEI/MCM-41) was developed for Cd(II) and Ni(II) removal from water. Characterization of PEI/MCM-41 using various techniques confirms its successful fabrication. Adsorption results reveal that pH and adsorbent dosage must be controlled for maximum removal. The adsorption rate was pseudo-second-order, and fitted well with Langmuir and Freundlich isotherms at equilibrium. The adsorption was thermodynamically spontaneous, endothermic and favourable. Adsorption capacities of 156.0 mg g(-1) Cd(II) and 139.7 mg g(-1) Ni(II) were on par with other high performing reported adsorbents. The PEI/MCM-41 was successfully reused demonstrating its potential for heavy metal decontamination application. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
P. Thakur,W. K. Choi,K. H. Chae,J.-Y. Kim,R. J. Choudhary,Shailja Tiwari,Ram Prakash,D. M. Phase,Ravi Kumar 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
We report on the growth and the characterization of magnetite thin films grown on Si(111) substrates by using pulsed laser deposition at different substrate temperatures (TS = 350, 450 and 550 ℃) by performing X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) experiments. The O K− and Fe L3,2−edge XAS spectra reveal that the couplings of the O 2p with Fe 3d orbitals highly rely on the growth processes. The XMCD data of well-characterized thin films exhibit characteristic contributions from Fe3+ A ions in tetrahedral sites and Fe2+ B and Fe3+ B ions in octahedral sites and have spectral features similar to those of the Fe3O4 single crystal. The temperature dependence of the XMCD line shape features remain unchanged below and above the Verwey transition. These investigations demonstrate the experimental conditions for controlled growth of Fe3O4 thin films on Si(111) substrates and suggest that the Fe3O4/Si(111) might a promising spintronic materials for future technology.
Thakur, P.,Kumar, R.,Cezar, J.C.,Brookes, N.B.,Sharma, A.,Arora, S.K.,Gautam, S.,Kumar, A.,Chae, K.H.,Shvets, I.V. North Holland 2011 Chemical physics letters Vol.501 No.4
We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in Al<SUB>2</SUB>O<SUB>3</SUB> (001) matrix prepared by ion-implantation (Ni:5x10<SUP>16</SUP>-2x10<SUP>17</SUP>ionscm<SUP>-2</SUP>) technique. The X-ray diffraction studies reveal the coexistence of fcc Ni NPs of average size ~8-19nm along with the other NiO<SUB>x</SUB> phases. X-ray magnetic circular dichroism (XMCD) experiments demonstrate the competing nature of magnetic interactions between the Ni NPs and NiO<SUB>x</SUB> phases. The ferromagnetism at 10K (for all the Ni implants) is related to the combined contribution of both phases, while the room temperature superparamagnetism at higher fluence is dominated by Ni NPs phase as confirmed by Ni L<SUB>3,2</SUB> XMCD measurements.
Amit K. Thakur,Grace M. Nisola,로렌스,Khino J. Parohinog,Rey Eliseo C. Torrejos,Vinod K. Shahi,정욱진 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
Nano-spherical amine-rich polyethylenimine (PEI) grafted on mesoporous silica (MCM-41) (PEI/MCM-41) was developed for Cd(II) and Ni(II) removal from water. Characterization of PEI/MCM-41 using varioustechniques confirms its successful fabrication. Adsorption results reveal that pH and adsorbent dosagemust be controlled for maximum removal. The adsorption rate was pseudo-second-order, andfitted wellwith Langmuir and Freundlich isotherms at equilibrium. The adsorption was thermodynamicallyspontaneous, endothermic and favourable. Adsorption capacities of 156.0 mg g 1 Cd(II) and 139.7 mg g 1Ni(II) were on par with other high performing reported adsorbents. The PEI/MCM-41 was successfullyreused demonstrating its potential for heavy metal decontamination application.