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RISS 인기검색어
- 검색키워드
- 저자 : V.P. Godbole (검색결과 2 건)
- 무료
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- 유료
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Hot filament chemical vapour deposition processing of titanate nanotube coatings
Godbole, V P,Kim, G S,Dar, M A,Kim, Y S,Seo, H K,Khang, G,Shin, H S IOP Pub 2005 Nanotechnology Vol.16 No.8
<P>In the present paper, we report on the processing of titanate nanotubes using the hot filament chemical vapour deposition (HF-CVD) method to synthesize titania–carbon nanotube–wire composites. The titanate nanotubes are prepared using a chemical route, and then deposited on <img SRC='http://ej.iop.org/images/0957-4484/16/8/035/nano197486ieqn1.gif' ALIGN='MIDDLE' ALT='\langle 100\rangle '/> silicon using an electrodeposition method. The HF-CVD is used to process these coatings at different temperatures in vacuum as well as in different concentrations of hydrogen (H<SUB>2</SUB>) and methane (CH<SUB>4</SUB>) gas mixtures. The evolutions of the surface and precipitation for various phases have been monitored using different characterization techniques. It is observed that titanate nanotubes start disintegrating above <I>T</I><SUB>s</SUB>∼500 ?C, and exhibit different types of phase precipitation depending upon the temperature and gas ambient. Under appropriate conditions, the presence of activated hydrogen and carbon radicals leads to the formation of novel architectures of mixtures of nanophases such as carbide, nonstoichiometric titania, carbon nanotubes, and titania decorated carbon nanowires. The results are discussed in terms of reduction in the thermal reaction barrier due to the presence of atomic hydrogen, and the formation of energetic sites during disintegration of titania nanotubes to facilitate nucleation of nanotube and nanowire structures.</P>
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Plasma enhanced chemical vapor deposition of palladium in anodic aluminum oxide template
Young-Soon Kim,V.P. Godbole,Joong-Hee Cho,Gilson Khang,Hyung-Shik Shin 한국물리학회 2006 Current Applied Physics Vol.6 No.1l
High quality AAO templates were fabricated using multi-step electrochemical process. The formation of well ordered pores havingdimensions of 50100 nm diameters and up to 2000 nm depths, could be achieved. The eect of processing time, voltage during anod-vapor deposition using palladium hexauro-acetylacetonate [Pd(C5HF6O2)2], as a precursor material. The samples were characterizedby using high resolution scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), glancing angle X-ray diractionetc. It is observed that the conformal coatings of palladium could be achieved in AAO pores, which could subsequently be utilized formany applications where in catalytic behavior of palladium is utilized.
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