化学加工单壁碳纳米管的拉曼和红外光谱学
Un Jeong Kim1, Clascidia A Furtado, Xiaoming Liu
1Departments of Physics and Materials Science, The Pennsylvania State University, University Park, PA 16802, USA.
Journal of the American Chemical Society
|November 3, 2005
概括
使用各种化学处理净化单壁碳纳米管 (SWNTs) 改变了它们的结构和振动光谱. 光谱分析揭示了缺陷的产生和功能化,这可以通过回来部分逆转.
科学领域:
- 材料科学 材料科学 材料科学
- 频谱学是一种光谱学.
- 纳米技术纳米技术
背景情况:
- 弧形衍生单壁碳纳米管 (SWNTs) 含有无形碳和金属催化剂等杂质.
- 净化对于获得各种应用的高质量的SWNT至关重要.
- 振动光谱 (红外和拉曼光谱) 是一种强大的工具,用于表征碳材料.
研究的目的:
- 系统地研究SWNT在不同净化协议期间的结构演变.
- 了解化学处理对SWNT振动光谱和缺陷形成的影响.
- 为了分析在高温回火后功能组的去除.
主要方法:
- 红外 (IR) 和拉曼光谱被用来研究SWNTs.
- 测试了各种涉及干氧化 (DO) 和酸处理 (HCl,HNO3) 或H2O2) 的净化方案.
- 在1100摄氏度的高温真空回火是在纯化的样本上进行的.
主要成果:
- 不同的净化方法导致SWNT振动光谱的明显变化,包括缺陷的产生 (开放的环,局部C=C键) 和添加含O的组.
- 拉曼光谱显示,较高的R和G频段强度比率与较低的D频段强度和较窄的G频段组件相关,表明骨疾病.
- 红外光谱学证实了在加工过程中引入的功能组的存在,并揭示了它们在高温回火后的去除,留下了SWNT声模式.
结论:
- 化学净化显著改变了SWNTs的结构和振动特性.
- 应用的光谱技术有效监测结构变化和缺陷演变.
- 高温回火可以去除加工诱导的功能组,恢复内在的SWNT振动模式.
相关概念视频
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