Journal
NANOSCALE
Volume 8, Issue 30, Pages 14608-14616Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr03470e
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Funding
- National Science Foundation (NSF) [CMMI 1404967]
- NSF [ECCS 1307671, CMMI-1404938]
- Defense Advanced Research Project Agency (DARPA)
- Semiconductor Research Corporation (SRC) via STARnet Center for Function Accelerated nanoMaterial Engineering (FAME)
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1404967, 1404938] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1307671] Funding Source: National Science Foundation
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We investigate the thermal conductivity of suspended graphene as a function of the density of defects, ND, introduced in a controllable way. High-quality graphene layers are synthesized using chemical vapor deposition, transferred onto a transmission electron microscopy grid, and suspended over similar to 7.5 mu m size square holes. Defects are induced by irradiation of graphene with the low-energy electron beam (20 keV) and quantified by the Raman D-to-G peak intensity ratio. As the defect density changes from 2.0 x 10(10) cm(-2) to 1.8 x 10(11) cm(-2) the thermal conductivity decreases from similar to(1.8 +/- 0.2) x 10(3) W mK(-1) to similar to(4.0 +/- 0.2) x 10(2) W mK(-1) near room temperature. At higher defect densities, the thermal conductivity reveals an intriguing saturation-type behavior at a relatively high value of similar to 400 W mK(-1). The thermal conductivity dependence on the defect density is analyzed using the Boltzmann transport equation and molecular dynamics simulations. The results are important for understanding phonon-point defect scattering in two-dimensional systems and for practical applications of graphene in thermal management.
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