摘要
利用直流电弧等离子体方法,以Ho/Ni作为催化剂合成了单壁碳纳米管,借助扫描电子显微镜、拉曼光谱和热重分析方法对所合成的单壁碳纳米管的形貌、结构以及含量进行了表征。电镜观察以及热重分析表明,收集到的大量网状物中单壁碳纳米管含量较高;不同激发波长拉曼测量表明碳纳米管直径分布比较集中,在1.35nm^1.69nm范围,且直径为1.5nm的碳纳米管占多数;与Ce/Ni等作为催化剂合成的单壁碳纳米管的直径分布不同。研究结果表明,Ho/Ni对于合成单壁碳纳米管具有很好的催化效果且影响管径分布,元素Ho对单壁碳纳米管的形成起到了重要的作用。
SWCNTs were synthesized with high yield by DC arc discharge using Ho/Ni as catalysts. The morphologies, diameter distribution and the content of SWCNTs in the products were characterized by SEM, Raman scattering and TGA. Results indicate that SWCNTs can be efficiently synthesized with Ho/Ni as catalysts. The volume content of SWCNTs in a ＂web-like＂ form is as high as 80 % in the product. Furthermore, the diameter distribution of SWCNTs, estimated by analyzing the resonance Raman scattering using excitation wavelengths of 632 and 488 rim, varies from 1.35 to 1.69 nm with a dominant diameter of 1.5 nm, which is different from that of the SWCNTs synthesized with Ce/Ni as catalyst, proving that the diameter distribution of SWCNTs is dependent on the properties of the metal catalysts.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2006年第1期70-74,共5页
New Carbon Materials
基金
国家自然科学基金(10204010
10144004
10574053)
教育部科技创新工程重大项目培育资助项目(2004-295)
跨世纪优秀人才培养计划
高等学校博士学科点专项研究基金(20020183050)
国家基础研究项目(2005CB724400)
国家重点基础研究发展计划
吉林省科技发展计划资助项目以及瑞典自然科学基金。~~
关键词
单壁碳纳米管
拉曼光谱
催化剂
稀土金属
Single-walled carbon nanotube
Raman spectroscopy
Catalyst
Rare-earth metal
