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首页> 外文学位 >Cutting of single-walled carbon nanotubes (SWNT): (1) Cutting of pristine SWNT by ozonolysis; (2) Ozonolysis of functionalized SWNT; (3) Cutting ozonated SWNT by e-irradiation; (4) Cutting fluorinated SWNT by pyrolysis.
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Cutting of single-walled carbon nanotubes (SWNT): (1) Cutting of pristine SWNT by ozonolysis; (2) Ozonolysis of functionalized SWNT; (3) Cutting ozonated SWNT by e-irradiation; (4) Cutting fluorinated SWNT by pyrolysis.

机译：切割单壁碳纳米管（SWNT）：（1）通过臭氧分解切割原始SWNT； （2）功能化单壁碳纳米管的臭氧分解； （3）通过电子辐照切割臭氧化的SWNT； （4）通过热解切割氟化SWNT。

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摘要

Using perfluoropolyether as the solvent, cutting of pristine SWNT has been achieved by extensive ozonolysis with 80% carbon yield at room temperature. The intense disorder mode in the Raman spectra of ozonated SWNT indicates that extensive reaction with the sidewalls of SWNT occurs during ozonolysis. AFM provided a measure of the extent of the cutting effects. Monitoring of the evolved gases indicates CO2 was produced during the ozonolysis process with a dependence on both system pressure and temperature. During heating, FTIR analysis of gases released indicates carbon oxygen groups on the sidewalls of SWNT are released as CO2.; Room temperature ozonolysis of fluorinated SWNT and phenol-sulfonated SWNT have also been studied in PFPE. For fluorinated SWNT, etching at the end caps has been demonstrated to be the dominating effect during this process. The improved suspension in 96% sulfuric acid after ozonolysis enables the cutting by ammonia peroxydisulfate without defluorination with a hydrazine treatment. PS-SWNT was found to be effectively cut by ozonolysis in a water suspension with preserved water solubility.; Controlled by the electron dosage, a high energy electron beam (3MeV) has been demonstrated to cut ozonated SWNT.; Besides ozonolysis, 700°C has been shown an optimal temperature to cut F-SWNT by pyrolysis in an argon atmosphere.
机译：使用全氟聚醚作为溶剂，在室温下通过大量的臭氧分解和80％的碳收率实现了原始SWNT的切割。臭氧化SWNT的拉曼光谱中的强烈无序模式表明，在臭氧分解过程中，与SWNT侧壁发生了广泛的反应。原子力显微镜可以测量切削效果的程度。监测放出的气体表明，在臭氧分解过程中会产生CO2，这取决于系统压力和温度。在加热过程中，对释放出的气体进行FTIR分析表明，SWNT侧壁上的碳氧基团以CO2的形式释放。 PFPE中还研究了室温下臭氧氧化氟化单壁碳纳米管和苯酚磺化单壁碳纳米管的方法。对于氟化单壁碳纳米管，已经证明在此过程中，在端盖处进行蚀刻是主要的作用。臭氧分解后在96％硫酸中的悬浮液得到了改进，因此可以用过氧二硫酸铵进行切割，而无需使用肼进行脱氟处理。发现PS-SWNT可在保持水溶解度的水悬浮液中通过臭氧分解有效地切割。在电子剂量的控制下，高能电子束（3MeV）已被证明可以切割臭氧化的SWNT。除臭氧分解外，还显示了在氩气气氛下通过热解将F-SWNT切割成700-℃的最佳温度。

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  • 作者

    Chen, Zheyi.;

  • 作者单位

    Rice University.;

  • 授予单位 Rice University.;
  • 学科 Chemistry Inorganic.; Chemistry Polymer.
  • 学位 M.S.
  • 年度 2006
  • 页码 75 p.
  • 总页数 75
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无机化学;高分子化学（高聚物）;
  • 关键词

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