Thermal Conductivity of Suspended Graphene at High Temperature Based on Raman Spectroscopy

TL;DR

This paper studies how well suspended graphene conducts heat at high temperatures, using Raman spectroscopy to improve thermal conductivity models.

Contribution

The study introduces a modified model for calculating thermal conductivity of suspended graphene by incorporating laser power attenuation and temperature variation effects.

Findings

Suspended graphene's thermal conductivity was calculated under high-temperature conditions using a modified model.

The influence of laser power on Raman peak positions was used to refine thermal conductivity measurements.

The study provides insights into phonon scattering and heat conduction mechanisms in graphene at elevated temperatures.

Abstract

With the development of technology, many fields have put forward higher requirements for the thermal conductivity of materials in high-temperature environments, for instance, in fields such as heat dissipation of electronic devices, high-temperature sensors, and thermal management. As a potential high-performance thermal management material, studying the thermal conductivity of graphene at high temperatures is of great significance for expanding its application range. In this study, high-quality suspended graphene was prepared through PDMS dry transfer, which can effectively avoid the binding and influence of the substrate. Based on the calculation model of the thermal conductivity of suspended graphene, the model was modified accordingly by measuring the attenuation coefficient of laser power. Combined with the temperature variation coefficient of suspended graphene measured experimentally and the influence of laser power on the Raman characteristic peak positions of graphene, the thermal conductance of suspended graphene with different layers under high-temperature conditions was calculated. It is conducive to a further in-depth understanding of the phonon scattering mechanism and heat conduction process of graphene at high temperatures.

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