引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 524次   下载 793 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Application of Thermogravimetry and Differential Thermal Analysis in Catalytic CVD Synthesis of Carbon Nanotubes
Lü Deyi,Xu Liping,Xu Zhude*,Ge Zhonghu
Author NameAffiliationE-mail
Lü Deyi Department of Chemistry, Zhejiang University, Hangzhou 310027; Department of Chemical Engineering, Zhejiang University of Technology, Hangzhou 320014  
Xu Liping Department of Chemical Engineering, Zhejiang University of Technology, Hangzhou 320014  
Xu Zhude* Department of Chemistry, Zhejiang University, Hangzhou 310027 chexzd@mail.Hz.zj.cn 
Ge Zhonghu Department of Chemical Engineering, Zhejiang University of Technology, Hangzhou 320014  
Abstract:
Multi-walled carbon nanotubes (MW-CNTs) were prepared by chemical vapor deposition (CVD) method with the decomposition of acetylene over Co/SiO2 catalyst. TG-DTA technique was used together with TEM and XRD to study the effect of reaction temperature on the composition, graphitized extent, and diameter distribution of the produced raw CNTs based on their oxidization resistance. During the decomposition, the micro-crystallite of the active constituent (Co/SiO2) were growing up as the reaction temperature rising. This in turn resulted in an increase of the diameter distribution range of produced MW-CNTs. The average diameter increased from 20~30 nm (650℃) to 30~50 nm (750℃). XRD results also showed the graphitized extent of MW-CNTs was enhanced meanwhile the spacing between the layers (d002) decreased from 3.45 (650℃) to 3.32 (850℃) with the reaction temperature raised. TG-DTA data showed that the exothermic peak of the amorphous carbon was below 380℃and its content would decrease as temperature increasing. In summary, for CVD production of CNTs using acetylene gas on Co/SiO2 catalyst, low temperature (about 650℃) favored producing thinner MW-CNTs with the diameter from 20 to 30 nm while higher temperature (about 850℃) is favored thicker MW-CNTs (diameter from 70 to 100 nm).
Key words:  Thermogravimetry, Differential Thermal Analysis, carbon nanotubes, CVD method
FundProject:浙江省自然科学基金资助项目(500105,298021).
CVD法制备碳纳米管的TG-DTA研究--温度对CVD法制备碳纳米管的影响
吕德义,徐丽萍,徐铸德*,葛忠华
摘要:
基于碳纳米管粗产品中无定形碳和不同直径碳纳米管对氧的反应活性的差异,通过差热-热重(TG-DTA)方法,结合透射电镜(TEM)和X射线衍射(XRD)的测试结果,研究了合成温度对以乙炔气体为碳源,用CVD法制备碳纳米管的石墨化程度、碳纳米管直径以及直径分布的影响.结果表明:反应中,由于催化剂Co/SiO2中活性组分(Co)微晶随合成温度的升高而增大,导致所制备的碳纳米管的直径增大,从20~30 nm(650℃)增加到30~50nm(750℃).碳纳米管的石墨化程度随着反应温度的升高而增加.XRD实验结果还表
关键词:  差热-热重分析  碳纳米管  CVD法
DOI:10.1088/1674-0068/15/2/118-122
分类号: