单壁碳纳米管的高压拉曼研究  

High pressure Raman study of single-wall carbon nanotubes

作　　者：路双臣[1] 姚明光[1] 江林海[1] 李全军[1] 刘兆东[1] 刘然[1] 刘冰冰[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室,长春130012

出　　处：《光散射学报》2011年第4期340-345,共6页The Journal of Light Scattering

基　　金：国家重点基础研究发展计划(2011CB808200);国家自然科学基金(10979001;51025206;51032001;21073071;11004075;11004090);教育部长江学者奖励计划

摘　　要：采用金刚石对顶砧装置对直径分布在1.3nm左右的单壁碳纳米管进行了高压拉曼光谱研究。实验结果表明随压力的增加碳管的截面形状发生了由圆到椭圆再到扁平的变化,这和我们之前的研究结果一致。从31GPa卸压至常压后碳管的结构得到了较好的保持,这个压力值明显高于传统的SP2键结构的碳材料所能稳定存在的压力范围(20GPa以下)。通过对碳管G-band半峰宽的详细分析,我们认为在较高的压力下碳管之间发生了成键,形成了一种更为稳定的结构。这种结构对高压下的碳管起到了保护作用,从而使碳管表现出了较好的可逆性。High pressure Raman measurements on single-wall carbon nanotubes（SWNTs） with diameters around 1.3 nm have been carried out in a diamond anvil cell.The results show that the changes of nanotube cross-section follow the sequences from circular to elliptical and then to a flattened type structure,which is consistent with our earlier studies.Upon decompression from a high pressure cycle of 31 GPa,the SWNTs are almost recovered to ambient pressure,a pressure well beyond the stability field of traditional sp2 C=C bonds below ~20 GPa.Through the detailed analysis of the linewidth of G-band,we proposed that at a critical pressure the inter-linked configuration is formed among the SWNTs,which can be taken as a more stable structure.This configuration can protect nanotubes experiencing very high pressure compression,so that the nanotubes are still reversible even after such high pressure cycle.

关 键 词：单壁碳纳米管 拉曼光谱 高压 

分 类 号：O657.37[理学—分析化学]