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采用化学气相沉积方法制备的碳纳米管,用酸溶液进行弱氧化处理,经适当温度在大气中烧灼后碳纳米管发生弯曲,在样品中出现大量的环状结构.利用原子力显微镜、透射电子显微镜和扫描电子显微镜对典型环直径为300nm的碳纳米管环进行了表征.烧灼温度和烧灼时间对环的结构和产率有重要的影响.实验数据统计结果表明,烧灼温度在510—530℃区间内可得到超过40%的碳纳米管环产率,并且烧灼时间延长到120min有利于提高碳纳米管环的产率.在加热情况下,碳纳米管端结合的羧基官能团脱水成酯,导致弯曲的碳纳米管结合成环.
The carbon nanotubes prepared by the chemical vapor deposition method are weakly oxidized with an acid solution, and the carbon nanotubes are bent after being burnt in the atmosphere at an appropriate temperature, and a large number of ring structures appear in the sample. The atomic force microscope, transmission electron microscope And scanning electron microscopy (SEM) were used to characterize the carbon nanotube rings with a typical ring diameter of 300 nm. The burning temperature and burning time had an important effect on the ring structure and yield. The experimental data showed that the burning temperature was in the range of 510-530 ℃ Yields a carbon nanotube ring yield of more than 40%, and prolonging the burn time to 120 minutes is beneficial for increasing the yield of the carbon nanotube ring.When heated, the carboxyl functional group bound to the carbon nanotube end undergoes dehydration to ester, resulting in bending Of the carbon nanotubes into a ring.