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| - Growth of Single-Walled Carbon Nanotubes on a Nanorough Surface
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| Abstract
| - We compare the growth of single-walled carbon nanotubes (SWNTs) on rough and smooth surfaces. Individualraw HiPco (high-pressure CO) SWNTs are deposited onto porous oxide nanoparticles on a silicon or quartzsubstrate. The HiPco SWNTs are shown to retain their original catalyst particles that are carbon coated as aresult of arrested growth due to bundle formation in the HiPco reactor. Overcoated catalysts are activatedwith O2 oxidation and SWNTs grown at 900 °C in the presence of CO and H2. The typical length of theSWNTs is more than 10 μm when grown on nanorough surfaces such as fumed silica. This is much longerthan the original HiPco SWNTs where the average length is approximately 0.5 μm. They are also muchlonger than SWNTs grown from the same source material with the same growth conditions on a flat siliconoxide surface. These results support the general impression that extensive interaction of both the nanotubeand the catalyst particle with an adjacent surface greatly retards growth.
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