Fig. 3
From: Thermal transport in layer-by-layer assembled polycrystalline graphene films
Cross-plane thermal properties of layer-by-layer assembled graphene films. a Schematic representation of experimental setup for TDTR measurements on layer-by-layer assembled graphene films. b Ratio of the in-phase to out-of-phase signals as a function of delay time between pump and probe pulses. Representative measurements for Al/SiO2/Si (no graphene), Al/graphene (N = 1)/SiO2/Si, and Al/graphene (N = 7)/SiO2/Si are shown. The solid lines are best fits to the experimental data (open symbols). c Thermal conductance per unit area G┴ of Al capped layer-by-layer assembled graphene films (filled squares) compared to single and few layer exfoliated graphene (x symbols).37 Error bars are the estimated experimental uncertainty. d, e Schematic representation and cross-section BF-STEM image of layer-by-layer assembled graphene films, respectively. The dark regions in e are trapped particulates believed to be Cu residues from the graphene transfer process. Scale bar is 5 nm. f Intensity profile (BF-STEM) across the stack of a layer-by-layer assembled graphene film (N = 7) showing the carbon peak intensity correlating to different graphene layers in the stack. The additional eighth peak is attributed to a bilayer region in one of the CVD transferred films
