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高压下碳纳米管的X射线衍射研究

DOI: 10.11858/gywlxb.2001.01.001, PP. 1-4

Keywords: 同步辐射,高压X射线衍射,碳纳米管

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Abstract:

用同步辐射原位高压能散X射线衍射技术,对碳纳米管进行了结构和物性的研究,压力达50.7GPa。在室温常压下,碳纳米管的结构和石墨的hcp结构相似,其(002)衍射线的面间距为d002=0.3404nm,(100)衍射线的面间距为d100=0.2116nm。从高压X射线衍射实验看到,当压力升到8GPa以上时,(002)线变宽变弱,碳纳米管部分非晶化。而当压力从10GPa或20GPa卸压至零时,(002)线部分恢复。但当压力升高至最高压力50.7GPa时,碳纳米管完全非晶化,而且这个非晶化相变是不可逆的。用Birch-Murnaghan方程拟合实验数据,得到体弹模量为K0=(54.3±3.2)GPa(当K′0=4.0时)。

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