Publications (2)0.71 Total impact
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Article: Controlled size and density distribution of nanoparticles by thermal ammonia etching method
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ABSTRACT: Nickel nanometer catalyst thin films were prepared on SiO2/Si substrates using sputtering coater. The effects of ammonia pretreatment on the catalyst films from continuous film to the nanoparticles were investigated. The nanostructures of the Ni thin films as a function of the catalyst film original thickness, the pretreatment time and temperature were discussed. The optimum parameters of etching process were obtained, and the functional mechanism of ammonia was primarily analyzed. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to evaluate the obtained nanoparticles. It is demonstrated that the controlled size and density distribution of the nanoparticles can be achieved by employing ammonia etching method.Journal of Wuhan University of Technology-Mater Sci Ed 05/2012; 25(1):108-111. · 0.35 Impact Factor -
Article: Synthesis of aligned carbon nanotubes by thermal chemical vapor deposition
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ABSTRACT: Single crystal silicon was found to be very beneficial to the growth of aligned carbon nanotubes by chemical vapor deposition with C2H2 as carbon source. A thin film of Ni served as catalyst was deposited on the Si substrate by the K575X Peltier Cooled High Resolution Sputter Coater before growth. The growth properties of carbon nanotubes were studied as a function of the Ni catalyst layer thickness. The diameter, growth rate and areal density of the carbon nanotubes were controlled by the initial thickness of the catalyst layer. Steric hindrance between nanotubes forces them to grow in well-aligned manner at an initial stage of growth. Transmission electron microscope analysis revealed that nanotubes grew by a tip growth mechanism.Journal of Wuhan University of Technology-Mater Sci Ed 01/2009; 24(1):15-19. · 0.35 Impact Factor
