Carbon nanohorns under cold compression to 40 GPa: Raman scattering and X-ray diffraction experiments

	Carbon nanohorns under cold compression to 40 GPa: Raman scattering and X-ray diffraction experiments
	Li, Bo 1,2,3; Nan, Yanli 1; Zhao, Xiang 2,3; Song, Xiaolong 1; Li, Haining 4; Wu, Jie 4; Su, Lei 4,5
刊名	APPLIED PHYSICS LETTERS
	2017-11-27
卷号	111 期号:22
英文摘要	We report a high-pressure behavior of carbon nanohorns (CNHs) to 40GPa at ambient temperature by in situ Raman spectroscopy and synchrotron radiation x-ray diffraction (XRD) in a diamond anvil cell. In Raman measurement, multiple structural transitions are observed. In particular, an additional band at similar to 1540cm(-1) indicative of sp(3) bonding is shown above 35GPa, but it reverses upon releasing pressure, implying the formation of a metastable carbon phase having both sp(2) and sp(3) bonds. Raman frequencies of all bands (G, 2D, D+G, and 2D') are dependent upon pressure with respective pressure coefficients, among which the value for the G band is as small as similar to 2.65 cm(-1) GPa(-1) above 10 GPa, showing a superior high-pressure structural stability. Analysis based on mode Gruneisen parameter demonstrates the similarity of high-pressure behavior between CNHs and single-walled carbon nanotubes. Furthermore, the bulk modulus and Gruuneisen parameter for the G band of CNHs are calculated to be similar to 33.3 GPa and 0.1, respectively. In addition, XRD data demonstrate that the structure of post-graphite phase derives from surface nanohorns. Based on topological defects within conical graphene lattice, a reasonable transformation route from nanohorns to the post-graphite phase is proposed. Published by AIP Publishing.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38327]
专题	化学研究所_光化学实验室
作者单位	1.Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China 2.Xi An Jiao Tong Univ, Inst Chem Phys, Sch Sci, Xian 710049, Shaanxi, Peoples R China 3.Xi An Jiao Tong Univ, Sch Sci, Dept Chem, Xian 710049, Shaanxi, Peoples R China 4.Zhengzhou Univ Light Ind, Ctr High Pressure Sci & Technol Res, Zhengzhou 450002, Henan, Peoples R China 5.Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Li, Bo,Nan, Yanli,Zhao, Xiang,et al. Carbon nanohorns under cold compression to 40 GPa: Raman scattering and X-ray diffraction experiments[J]. APPLIED PHYSICS LETTERS,2017,111(22).
APA	Li, Bo.,Nan, Yanli.,Zhao, Xiang.,Song, Xiaolong.,Li, Haining.,...&Su, Lei.(2017).Carbon nanohorns under cold compression to 40 GPa: Raman scattering and X-ray diffraction experiments.APPLIED PHYSICS LETTERS,111(22).
MLA	Li, Bo,et al."Carbon nanohorns under cold compression to 40 GPa: Raman scattering and X-ray diffraction experiments".APPLIED PHYSICS LETTERS 111.22(2017).