Raman study of carbon nano-structured materials pressurized with H2

被引:1
作者
Nakayama, A. [1 ]
Tanaka, Y. [2 ]
Nishiyama, Y. [3 ]
Nakano, S. [4 ]
机构
[1] Niigata Univ, Ctr Transdisciplinary Res, 8050 Ikarashi Ninocho, Niigata 9502181, Japan
[2] Niigata Univ, Dept Phys, Niigata 9502181, Japan
[3] Joetsu Univ Educ, Joetsu 9438512, Japan
[4] NIMS, Tsukuba, Ibaraki 3050044, Japan
来源
INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, JOINT AIRAPT-22 AND HPCJ-50 | 2010年 / 215卷
关键词
D O I
10.1088/1742-6596/215/1/012046
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We have pressurized meso-carbon micro-beads (MCMBs) in combination with H-2 at room temperature and obtained the Raman spectra under pressure up to 2 GPa. The peak frequencies of G-, H-H stretching and H-2 rotational bands show simultaneous changes in the following pressure ranges: P <= 0.66 GPa, 0.66 GPa < P <= 1.0 GPa, and 1 GPa < P. Both the G- and H-H stretching bands show mode-hardenings in the pressure range up to 0.66 GPa. In the range between 0.66 and 1 GPa, the G-band shows the softening in addition to the invariable peak-frequency shift of H-H stretching band. At the pressures above 1 GPa, the both peak frequencies monotonously increase with increasing the pressure. According to previous x-ray diffraction observation, the a-axis length shows abrupt increase at 0.66 GPa. Taking the overlapping of wave functions between sigma-bond of H-2 and pi-bond of graphite into account, we speculate the followings: the intercalation of H-2 into the regulated nano-space of MCMBs at the pressures below 0.66 GPa, eliminating of H-2 from the nano-space in the range between 0.66 and 1 GPa, and hydrostatic compression of MCMBs by the eliminated H-2 at pressures above 1 GPa.
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页数:5
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