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采用金刚石对顶砧装置对直径分布在1.3nm左右的单壁碳纳米管进行了高压拉曼光谱研究。实验结果表明随压力的增加碳管的截面形状发生了由圆到椭圆再到扁平的变化,这和我们之前的研究结果一致。从31GPa卸压至常压后碳管的结构得到了较好的保持,这个压力值明显高于传统的SP2键结构的碳材料所能稳定存在的压力范围(20GPa以下)。通过对碳管G-band半峰宽的详细分析,我们认为在较高的压力下碳管之间发生了成键,形成了一种更为稳定的结构。这种结构对高压下的碳管起到了保护作用,从而使碳管表现出了较好的可逆性。
High-pressure Raman spectroscopy of single-walled carbon nanotubes with a diameter of about 1.3 nm was carried out on a diamond anvil cell. The experimental results show that with the increase of pressure, the cross-sectional shape of the carbon tube changes from circle to ellipse to flattened, which is consistent with our previous study. The structure of the carbon tube is well maintained after the pressure is released from 31GPa to atmospheric pressure, which is obviously higher than the pressure range (under 20GPa) that the traditional SP2-bonded carbon material can stably exist. Through a detailed analysis of the half-width of the carbon nanotube G-band, we believe that the carbon nanotubes bond at higher pressures and form a more stable structure. This structure plays a protective role on the carbon tube under high pressure, so that the carbon tube has shown a good reversibility.