Temperature-Activated Layer-Breathing Vibrations In Few-Layer Graphene

Authors

Chun Hung Lui, Massachusetts Institute of TechnologyFollow
Zhipeng Ye, University of Northern IowaFollow
Courtney Keiser, University of Northern IowaFollow
Xun Xiao, University of Northern Iowa
Rui He, University of Northern IowaFollow

Document Type

Article

Keywords

adsorption, few layer, graphene, layer breathing mode, Raman, shear mode

Journal/Book/Conference Title

Nano Letters

Volume

14

Issue

8

First Page

4615

Last Page

4621

Abstract

We investigated the low-frequency Raman spectra of freestanding few-layer graphene (FLG) at varying temperatures (400-900 K) controlled by laser heating. At high temperature, we observed the fundamental Raman mode for the lowest-frequency branch of rigid-plane layer-breathing mode (LBM) vibration. The mode frequency redshifts dramatically from 81 cm-1 for bilayer to 23 cm-1 for 8-layer. The thickness dependence is well described by a simple model of coupled oscillators. Notably, the LBM Raman response is unobservable at room temperature, and it is turned on at higher temperature (>600 K) with a steep increase of Raman intensity. The observation suggests that the LBM vibration is strongly suppressed by molecules adsorbed on the graphene surface but is activated as desorption occurs at high temperature. © 2014 American Chemical Society.

Department

Department of Physics

Original Publication Date

8-13-2014

DOI of published version

10.1021/nl501678j

Recommended Citation

Lui, Chun Hung; Ye, Zhipeng; Keiser, Courtney; Xiao, Xun; and He, Rui, "Temperature-Activated Layer-Breathing Vibrations In Few-Layer Graphene" (2014). Faculty Publications. 1369.
https://scholarworks.uni.edu/facpub/1369