中文摘要：

系统研究了在硫酸溶液中用γ辐射法剪切单壁碳纳米管,初步探索了在激光以及γ射线照射下的水溶液中单壁碳纳米管的光声效应,并对辐射剪切单壁碳纳米管的机制进行了讨论。用透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）以及拉曼光谱对短单壁碳纳米管进行分析和表征。结果表明：γ辐射和硫酸氧化作用在剪切碳管的过程中存在协同效应,得到的短碳纳米管的平均长度为200～400nm,在水中可稳定分散1周;辐射剪切在碳纳米管外侧及端帽处引进—OH、—COOH等官能团。另外,Q开关脉冲激光照射下的单壁碳纳米管在溶液中会发生强光声效应,相比而言,当照射碳管的光子能量达到γ光子能量时碳管的光声效应非常微弱。

英文摘要：

The cutting of single-walled carbon nanotubes（SWNTs） with γ radiation in the presence of sulfuric acid was researched systemically.The photoacoustic effect of SWNTs caused by laser and γ radiation in aqueous solution was initially investigated.Moreover,the proposed mechanism for the cutting process of SWNTs was also analyzed.The short SWNTs were characterized and analyzed with transmission electron microscopy（TEM）,Fourier transform infrared spectroscopy（FT-IR）,ultraviolet-visible spectroscopy（UV-Vis） and Raman spectroscopy.Results indicate a synergetic effect between the γ radiation and sulfuric acid oxidation on the cutting of SWNTs.The resulted short nanotubes have a length distribution of 200-400 nm.Moreover,it can be uniformly dispersed in water for one week.The cutting approach induces the production of a certain number of —OH,—COOH functional groups on the short SWNTs.In addition,SWNTs irradiated by Q switch pulsed laser will occur a large photoacoustic effect in the solution,while SWNTs irradiated by γ exist a much weaker photoacoustic effect.