多壁碳纳米管在硫酸溶液中的γ辐射剪切

材料导报, 2010, 24(14): 22-25.

多壁碳纳米管在硫酸溶液中的γ辐射剪切

孙浩 ^1, , 戴耀东 ^2, , 李江苏 ^3, , 张瑜 ^4, , 李俊 ^5,

1.南京航空航天大学材料科学与技术学院,南京,210016

2.南京航空航天大学材料科学与技术学院,南京,210016

3.南京航空航天大学材料科学与技术学院,南京,210016

4.南京航空航天大学材料科学与技术学院,南京,210016

5.南京航空航天大学材料科学与技术学院,南京,210016

基金项目: 江苏省自然科学基金(BK2008400)

关键词：多壁碳纳米管(MWNTs) , γ辐射 , 剪切 , 协同效应

Gamma-radiation Cutting of Multi-walled Carbon Nanotubes in the Presence of Sulfuric Acid

在硫酸溶液中系统地研究了γ辐射法剪切多壁碳纳米管,以及影响碳管长度的反应条件,详细讨论了多壁碳纳米管的剪切机理.采用透射电子显微镜(TEM)、傅立叶变换红外光谱(FT-IR)、紫外可见分光光度计(UV-Vis)和Raman光谱对短多壁碳纳米管进行了分析与表征,分析了多壁碳纳米管浓度与其对UV270nm吸光度的关系,得出了多壁碳纳米管质量浓度与其对UV270nm吸光度的线性回归方程.结果表明,γ辐射和硫酸氧化作用在剪切多壁碳纳米管的过程中存在协同效应.随着辐射剂量和酸浓度的增加,剪切后的碳管长度不断缩短.当辐射剂量增加到200kGy、酸浓度为5mol/L时,短多壁碳纳米管长度为200～300nm.辐射剪切的方法在碳纳米管外侧及末端引进C-OH、-COOH等官能团,从而对MWNTs的石墨型结构造成微弱损伤.另外,制备的短多壁碳管在水中可以均匀分散2周而不出现沉淀.

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