以Y/Ni为催化剂制备的单壁碳纳米管的拉曼光谱研究  

Raman Scattering of Single-wall Carbon Nanotubes Produced Using Y/Ni Catalyst

作　　者：王玉芳[1] 刘浩然[2] 徐晓轩[1] 邵悦[1] 曹学伟[1] 扈士芬[1] 刘友婴[2] 蓝国祥[1] 

机构地区：[1]南开大学物理科学学院,天津300071 [2]南开大学电子科学系,天津300071

出　　处：《光谱学与光谱分析》2002年第4期580-583,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金 ( 698780 11);天津市重点自然科学基金资助项目

摘　　要：采用电弧放电法以Y/Ni为催化制备了单壁碳纳米管 (SWNTs) ,对样品进行了扫描电镜、透射电镜和拉曼光谱的研究。所制备的样品中单壁碳纳米管的含量较高。对单壁碳纳米管的共振拉曼散射增强效应进行了观察 ,随激光波长的不同 ,单壁碳纳米管的拉曼光谱也随之变化 ,尤其是低频区径向呼吸模的变化比较明显。利用布里渊区折叠法计算了单壁碳纳米管的电子态密度曲线 ,根据SWNTs电子态密度尖峰之间的能量差、管子的直径和呼吸模频率建立了一个图表 ,并对SWNTs的呼吸模进行了归属。分析结果表明 :样品中单壁碳纳米管的直径分布在 0 79～ 1 76nm范围 ,金属管和半导体管均存在 ,并且直径在 1 4Single wall carbon nanotubes (SWNTs) were synthesized by electric arc discharge method with a mixture. of nickel and yttrium. as catalysts. The examination results of scanning electronic microscope and transmission electronic microscope indicate that the yield of SWNTs in the sample were high. SWNTs have been investigated by Raman scattering techniques with excitation wavelengths in the range of 514.5 to 782.0 nm. We have observed some differences in the frequencies and intensities of the radial breathing modes. The electronic density of states of SWNTs was calculated using the Brillouin zone folding. A graphical method was proposed for assigning Raman peaks of the radial breathing modes (RUB) based on the data of diameters, RBM frequencies and electronic density of states of SWNTs. The radial breath in,g modes on SWNTs are assigned. The results indicate that the diameter distribution of SWNTs is in the range of 0.79-1.76 nm, and the SWNTs with diameter 1.45 nm are in the majority. The metallic and semiconductor tubes are all present in the sample.

关 键 词：Y/Ni 镍负载钇催化剂 单壁碳纳米管 电弧放电法 拉曼光谱 

分 类 号：O613.71[理学—无机化学] TB383[理学—化学]