M. T. Pettes, Jo, I., Yao, Z., and Shi, L., “Influence of Polymeric Residue on the Thermal Conductivity of Suspended Bi-Layer Graphene,” Nano Letters, vol. 11, no. 3, pp. 1195–1200, 2011.
The thermal conductivity (κ) of two bilayer graphene samples each suspended between two microresistance thermometers was measured to be 620 ± 80 and 560 ± 70 W m−1 K−1 at room temperature and exhibits a κ T1.5 behavior at temperatures (T) between 50 and 125 K. The lower κ than that calculated for suspended graphene along with the temperature dependence is attributed to scattering of phonons in the bilayer graphene by a residual polymeric layer that was clearly observed by transmission electron microscopy.