温控电弧法大量制备单壁碳纳米管
首发时间:2005-01-07
摘要: 采用可以控制真空室温度的改进型直流电弧炉,在氮气和氦气(1:1)混合气氛下,使用Co-Ni(1:1wt%)合金催化剂,通过控制温度等工艺条件,在容器内壁生成了大量单壁碳纳米管,尤其在阴极与阳极之间有大量的宏观网状薄膜. 通过两步纯化方法:在500℃空气中烘烧30min;再用37%盐酸浸泡72h,用去离子水过虑至中性烘干;经SEM、HRTEM、XRD、Raman观察分析,纯化后其纯度高(>95%)、管径均匀(1.24nm~1.38nm) .实验结果表明:温度强烈影响单壁碳纳米管的产量,不同温度下管子的纯度、产量都有差异;在温度为600℃时,其纯度达到70%,产量为8.4g/h.
关键词: 单壁碳纳米管(SWNTs) 电弧法 温度影响 网状薄膜
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Large scale synthesis of single-walled carbon nanotubes by an arc-discharge method under controlled temperatures
Abstract:Large amounts of single-wall carbon nanotubes(SWNTs) deposited on all the wall of the chamber have been obtained, in helium and nitrogen mixed atmospheres using Co-Ni alloy catalyst with a modified arc furnace which can control the temperature during arcing process. Additionally, there are many web-like deposition products between the cathode and anode. By two-step purification: as-grown SWNT was heated in air at 500℃ for 30min ; then soaked them in 37% hydrochloric acid for 72h and filter with deionized water. Micro-analysis was carried out by TEM、HRTEM and Raman spectroscopy. The results indicate that the purified SWNTs have high purity (higher than 95%) and uniform diameter (from 1.24nm to 1.38nm). This experiment indicates that the temperature strongly affects the production of SWNT, the production and purity of SWNT increase with temperatures. When temperature at 600℃, the purity is about 70% and the production of SWNT is 8.4g/h.
Keywords: Single-walled carbon nanotubes(SWNTs), Arc-discharge, Temperatures effect, Web-like film
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No.1433186281105061****
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