Revealing properties of single-walled carbon nanotubes under high pressure
Revealing properties of single-walled carbon nanotubes under high pressure
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DOI：
10.1088/0953-8984/14/44/335
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发表时间：
2002-10
期刊：
影响因子：
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通讯作者：
Jie Tang;L. Qin;Taizo Sasaki;M. Yudasaka;A. Matsushita;S. Iijima
中科院分区：
文献类型：
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作者：
Jie Tang;L. Qin;Taizo Sasaki;M. Yudasaka;A. Matsushita;S. Iijima
通过在静水压力下的X射线衍射实验发现，碳纳米管很容易被压缩，具有0.024 GPa−1的高体积压缩率。当单壁碳纳米管形成六方密排结构的碳纳米管束，且管间间隙小于石墨的平衡间距时，单壁碳纳米管被石墨化。在高压下，发生进一步的液化以适应额外的体积减少量。当纳米管晶格的布拉格反射减弱时，六角化截面中短对角线和长对角线的比值从零压力下的0.991变为1.5GPa压力下的0.982。在1.5GPa压力下，伴随着相变，观察到电阻率的不连续变化，表明发生了相变。
It was found by the x-ray diffraction experiment under hydrostatic pressure that the carbon nanotubes are compressed easily with a high volume compressibility of 0.024 GPa−1. The single-walled carbon nanotubes are polygonized when they form bundles of hexagonal close-packed structure and the inter-tubular gap is smaller than the equilibrium spacing of graphite. Under high pressure, further polygonization occurs to accommodate the extra amount of volume reduction. The ratio of the short and the long diagonals in the hexagonalized cross section is found to have changed from 0.991 at zero pressure to 0.982 at 1.5 GPa pressure, when the Bragg reflection from the nanotube lattice diminished. Accompanying polygonization, a discontinuous change in electrical resistivity was observed at 1.5 GPa pressure, suggesting a phase transition had occurred.