Large‐Area Freestanding Graphene Paper for Superior Thermal Management

Abstract

Large-area freestanding graphene papers (GPs) are fabricated by electrospray deposition integrated with a continuous roll-to-roll process. Upon mechanical compaction and thermal annealing, GPs can achieve a thermal conductivity of as high as 1238.3-1434 W m(-1) K(-1) . The super-thermally conductive GPs display an outstanding heat-spread ability and are more efficient in removing hot spots than Cu and Al foils.

Recent Advances in Graphene-Based Free-Standing Films for Thermal Management: Synthesis, Properties, and Applications

“…Thermal annealing in a proper temperature may partially reduce GO to rGO, thus leading to the higher thermal conductivity of the GFs. Previous studies have corroborated that the thermal annealing temperature exerts a significant impact on the thermal conductivity of the GFs [28,37,38,40]. Renteria et al [38] studied the effect of thermal annealing temperature on the thermal conductivity of the rGO films.…”

“…For instance, Xin et al [40] adopted a novel approach integrating electron-spray deposition (ESD) and a roll-to-roll device to manufacture the free-standing GFs with large area; the process is illustrated in Figure 2. In the ESD process (Figure 2a), tiny droplets were generated by the repulsion force between electrical charges and the droplets, while the size of the droplets could be controlled by adjusting the flow speed and electric field.…”

“…Xin et al [40] conducted compaction to remove air pores to fabricate dense GFs, but with different density. Even at different annealed temperatures, the thermal conductivity of the GFs significantly elevated with the increase in the GFs' density.…”

Synthesis, Structure, and Properties of Graphene and Graphene Oxide

“…The enhancement in thermal conductivity of multilayer GO than graphite is attributed to the intercalating oxygen atoms that introduced covalent bridges between the interlayers for interaction [200]. Due to the intrinsic properties of the individual graphene sheets and the highly aligned structure of GO papers (GOPs) and graphene papers (GPs), these flexible materials also show unique thermal properties [204]. Thermal conductivities of GOPs and GOPs modified by divalent ions, Mg 2+ and Ca…”

Enhanced cooling in mono-crystalline ultra-thin silicon by embedded micro-air channels

“…Scaling of device dimensions has enabled performance enhancement but as a trade-off scaled devices experience higher leakage current induced excessive power consumption in their idle state. [1][2][3][4][5][6][7] This also results into higher heat dissipation and eventually lower battery lifetime. With increased demand for ultra-mobile electronics, this rapid power draining acts as one of the main show stoppers.…”