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Iron And Cobalt Silicide Catalysts-assisted Carbon Nanostructures On The Patterned Si Substrates

H. Chang, Chaotong Lin, C. Kuo
Published 2002 · Materials Science

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Catalyst-assisted carbon nanotubes (CNTs) and carbon nano-rods were synthesized on the patterned or un-patterned Si wafer by microwave plasma chemical vapor deposition, using iron or cobalt silicide catalysts. Controllable carbon nanostructures were achieved by manipulating carbon and nitrogen concentration in the source gases, catalyst materials, and patterned wafer application. CNTs were synthesized under a high ratio of CH4/H2=0.1, while carbon nano-rods were synthesized under a low ratio of CH4/H2=0.01. Introducing N2 gas into CH4/H2 source gases gives rise to bamboo-like CNTs formation. Selective CNTs depositions were applied on (a) parallel Fe-coated line arrays, (b) CoSix-coated hole arrays. This is a novel method that is compatible with Si microelectronic device manufacturing. The field emission results indicate that the emission current density can be above 1 mA/cm2 at 3.97 V/μm, and hollow like CNTs belong to better emission current than bamboo-like CNTs. Growth models of different carbon nanostructures are proposed.
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