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Fabrication and characterizations of metallic nanostructured materials

Authors Wong, Chi Cheong
Issue Date 2011
Summary In this research, effective infiltration and deposition of metals into mesopores are achieved by supercritical fluid deposition (SFD) and modified chemical vapour deposition (CVD). A specific platinum nanostructure is fabricated by precursor infiltration in hard template-based synthesis via Supercritical Fluid Deposition (SFD) in supercritical carbon dioxide and MOCVD (Metal organic CVD) in ammonia. Anodic alumina membrane (AAM) with pore diameter of about 200 nm and mesoporous silica Santa Barbara Amorphous No. 15 (SBA-15) with pore diameter of about 6 nm were used as the hard templates respectively. It was found that metal infiltration via CVD was not feasible for AAM, but a metallic platinum thin film is formed on AAM surface instead. Platinum rods are fabricated by SFD within the pore channels of AAM, though the complete filling of pores cannot be achieved yet. For SBA-15, both CVD and SFD are found to effectively deposit the metals into the mesopores, complete mesopores filling is accomplished. After removal of template, bundles of freestanding Pt nanowires can be recovered. Platinum nanowires with aspect ratio of over 80 were fabricated successfully via SFD method, while CVD can give platinum nanowires with length of about 100 nm. Its potential applications in electronic and catalytic fields can be studied after study of physical and chemical properties of nanowires prepared.
Note Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2011
Language English
Format Thesis
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