期刊
CARBON
卷 171, 期 -, 页码 568-574出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.09.018
关键词
Carbon nanostructures; Anharmonic effect; Raman spectroscopy; Raman microscopy
资金
- UGC, NewDelhi (India)
- Department of Science and Technology (DST), New Delhi (India) [DST/INSPIRE04/2017/002776, DST/INSPIRE/04/2015/000902]
- Science and Engineering Research Board (SERB), Govt. of India [CRG/2019/000371]
- Council of Scientific and Industrial Research (CSIR) [09/1022(0039)/2017-EMR-I]
- DST, Govt. of India, under FIST scheme [SR/FST/PSI-225/2016]
A temperature dependent Raman spectromicroscopic study was conducted on multiwall carbon nanotubes to investigate anharmonic effects, revealing non-linear shifts in the peak position of Raman D- and G-bands with temperature. Phonon softening and hardening of Raman modes were observed over a wide temperature range, with the G-peak shift explained by anharmonic properties of the graphite lattice. The width variation of the G-peak appeared to be nearly independent of temperature due to competing effects from electron-phonon coupling and anharmonic contributions.
The temperature dependent Raman spectromicroscopic study has been carried out to investigate anharmonic effects in multiwall carbon nanotubes (MWCNT). The micro-Raman scattering experiments have been carried out over a wide temperature range of 173-723 K to analyze manifestation of various MWCNT Raman modes' energy and lifetimes. The experimental results indicated non-linear shifts in the peak position of Raman D- and G-bands with temperature. Phonon softening of Raman modes was observed over a wide temperature range from 273-648 K, and hardening of Raman modes was noticed in both, high- and low-, temperature regimes. Temperature dependent shift of the G-peak has been explained on the basis of anharmonic properties of graphite lattice. Contributions from true-anharmonic and quasi-harmonic parts in shifting the G-peak position have also been explained. Interestingly, the variation of peak width for G-peak of MWCNT appeared to be nearly independent of temperature, likely due to the competing effects from the electron-phonon coupling and anharmonic contributions in the observed temperature range. (C) 2020 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据