CVD Synthesis of Small-Diameter Single Walled Carbon Nanotubes on Silicon

Scientia Iranica (Impact Factor: 1.03). 07/2012; 16(1).
Source: arXiv


A simple process for chemical vapor deposition of ultra SD single wall carbon
nanotubes has been developed. In this process, an iron nitrate nonahydrate
solution in isopropyl alcohol with a concentration of 400 ug/mlit was used to
catalyze nanoparticles formation on an oxidized silicon wafer. The oxide on the
substrate was made of a thick layer of wet oxide sandwiched between tow thin
layers of dry oxide. The process results in semiconducting single-walled carbon
nanotubes (SWNTs) with diameter of less than 0.7nm and more than 1ev band gap
energy, which are amongst the smallest diameters of SWNTs ever reported.

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    • "SWNTs have diameters ranging from about 0.7 nm to about 1 nm, but their synthesis with diameters of less than 0.7 nm using iron nitrate has been reported.63 MWNTs have a larger diameter, which can be 4–30 nm.64,65 "
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