title: Thermal transport in suspended and supported few-layer graphene.
abstract: We report thermal conductivity (κ) measurements from 77 to 350 K on both suspended and supported few-layer graphene using a thermal-bridge configuration. The room temperature value of κ is comparable to that of bulk graphite for the largest flake, but reduces significantly for smaller flakes. The presence of a substrate lowers the value of κ, but the effect diminishes for the thermal transport in the top layers away from the substrate. For the suspended sample, the temperature dependence of κ follows a power law with an exponent of 1.4 ± 0.1, suggesting that the flexural phonon modes contribute significantly to the thermal transport of the suspended graphene. The measured values of κ are generally lower than those from theoretical studies. We attribute this deviation to the phonon-boundary scattering at the graphene-contact interfaces, which is shown to significantly reduce the apparent measured thermal conductance of graphene.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Republic of Singapore.
authors.forename: Ziqian
authors.initials: Z
authors.lastname: Wang
authors.forename: Rongguo
authors.initials: R
authors.lastname: Xie
authors.forename: Cong Tinh
authors.initials: CT
authors.lastname: Bui
authors.forename: Dan
authors.initials: D
authors.lastname: Liu
authors.forename: Xiaoxi
authors.initials: X
authors.lastname: Ni
authors.forename: Baowen
authors.initials: B
authors.lastname: Li
authors.forename: John T L
authors.initials: JT
authors.lastname: Thong