Controlling the Diameter of SWNTs by Improving the Dispersion of the Uniform Catalyst Nanoparticles on Substrate
To have uniform nanoparticles individually dispersion on substrate before CNTs growth at high temperature is the key for controlling the diameter of the SWNTs. In this paper, we report our approach to control the SWNTs diameter and to understand the relationship between the dispersion of catalyst nanoparticles on substrate surface and the SWNTs diameter by improving the dispersion of the uniform Fe/Mo nanoparticles on silicon wafers. Silicon wafer with silica layer was chemically modified by 1,1,1,3,3,3-Hexamethyldisilazane under different condition. The dispersion of Fe/Mo nanoparticles on the silicon wafer was systematically investigated. It was found that the dispersion of the catalyst nanoparticles on Si wafer surface can be improved greatly from hydrophilic to hydrophobic. The diameter distribution of SWNTs depends strongly on the dispersion of the catalyst.Well dispersion of the catalyst results in uniform diameter of the SWNTs due to the decrease of the aggregation.
single-walled carbon nanotubes diameter control chemical modification of substrate CVD
白延虎 黄少铭
纳米材料与化学重点试验 温州大学 温州 中国
国际会议
成都
英文
2007-11-19(万方平台首次上网日期,不代表论文的发表时间)