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Controlling the Diameter of Single-Walled Carbon Nanotubes by Improving the Dispersion of the Uniform Catalyst Nanoparticles on Substrate.
Nano-Micro Letters ( IF 26.6 ) Pub Date : 2015-01-01 , DOI: 10.1007/s40820-015-0050-8
Junjun Chen 1 , Xiangju Xu 1 , Lijie Zhang 1 , Shaoming Huang 1
Affiliation  

To have uniform nanoparticles individually dispersed on substrate before single-walled carbon nanotubes (SWNTs) growth at high temperature is the key for controlling the diameter of the SWNTs. In this letter, a facile approach to control the diameter and distribution of the SWNTs by improving the dispersion of the uniform Fe/Mo nanoparticles on silicon wafers with silica layer chemically modified by 1,1,1,3,3,3-hexamethyldisilazane under different conditions is reported. It is found that the dispersion of the catalyst nanoparticles on Si wafer surface can be improved greatly from hydrophilic to hydrophobic, and the diameter and distribution of the SWNTs depend strongly on the dispersion of the catalyst on the substrate surface. Well dispersion of the catalyst results in relatively smaller diameter and narrower distribution of the SWNTs due to the decrease of aggregation and enhancement of dispersion of the catalyst nanoparticles before growth. It is also found that the diameter of the superlong aligned SWNTs is smaller with more narrow distribution than that of random nanotubes.

中文翻译:

通过提高均匀催化剂纳米颗粒在基材上的分散度来控制单壁碳纳米管的直径。

在高温下单壁碳纳米管(SWNTs)生长之前,要使均匀的纳米粒子分别分散在基板上是控制SWNTs直径的关键。在这封信中,提出了一种简便的方法来控制单壁碳纳米管的直径和分布,方法是在以下条件下通过用1,1,1,3,3,3-六甲基二硅氮烷化学改性的二氧化硅层改善均匀的Fe / Mo纳米颗粒在硅片上的分散性报告了不同的情况。发现催化剂纳米颗粒在Si晶片表面上的分散可以从亲水性到疏水性得到极大改善,并且SWNT的直径和分布强烈取决于催化剂在基材表面上的分散性。由于生长前催化剂纳米颗粒的聚集减少和分散增强,催化剂的良好分散导致了相对较小的直径和更窄的SWNT分布。还发现,与无规纳米管相比,超长取向SWNT的直径更小且分布更窄。
更新日期:2015-07-23
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