Temperature Coefficients of the Raman Peaks for the Single-Layer and Bi-Layer Graphene

TL;DR

This study measures how Raman peak frequencies in single-layer and bi-layer graphene shift with temperature, providing key data for thermal and electronic applications of graphene.

Contribution

It provides the first detailed measurement of temperature coefficients for Raman peaks in single- and bi-layer graphene, confirmed by independent methods.

Findings

G-band temperature coefficient for single-layer graphene: -0.016 1/(cm K)

2D-band temperature coefficient for single-layer graphene: -0.034 1/(cm K)

G peak temperature coefficient for bi-layer graphene: -0.015 1/(cm K)

Abstract

We carried out micro-Raman spectroscopy of graphene layers over the temperature range from approximately 80 K to 370 K. The number of layers was independently confirmed by the quantum Hall measurements and atomic force microscopy. The measured values of the temperature coefficients for the G and 2D-band frequencies of the single-layer graphene are -0.016 1/(cm K) and -0.034 1/(cm K), respectively. The G peak temperature coefficient of the bi-layer graphene and bulk graphite are -0.015 1/(cm K) and -0.011 1/(cm K), respectively.