Abstract
Graphene aerogels have attracted much attention as a promising material for various applications. The unusually high intrinsic thermal conductivity of individual graphene sheets makes an obvious contrast with the thermal insulating performance of assembled 3D graphene materials. We report the preparation of anisotropy 3D graphene aerogel films (GAFs) made from tightly packed graphene films using a thermal expansion method. GAFs with different thicknesses and an ultimate low density of 4.19 mg cm−3 were obtained. GAFs show high anisotropy on average cross-plane thermal conductivity (K⊥) and average in-plane thermal conductivity (K||). Additionally, uniaxially compressed GAFs performed a large elongation of 11.76% due to the Z-shape folding of graphene layers. Our results reveal the ultralight, ultraflexible, highly thermally conductive, anisotropy GAFs, as well as the fundamental evolution of macroscopic assembled graphene materials at elevated temperature.
Highlights
We proposed a mechanism for forming 3D graphene aerogel films (GAFs)
3Dgraphene grapheneaerogel aerogel films (GAFs) prepared tightly packed grafilms were successfully developed by a facial high-temperature thermal expansion method
Phene films were successfully developed by a facial high-temperature thermal expansion
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Raman spectroscopy technique is in the range of~3000–5300 W m−1 K−1 at room temtemplate-directed approaches is determined by templates, polymers or metallic substrates, removal of which always causes collapse of the as-formed pore structure of graphene networks [14]. Tolike exploit the high thermal conductivity, graphene is generally in the form of macroscopic assemblies. Pattern, packing density, thermal boundary resistance, orientation, and structure contiWhen it comes to 3D assembled graphene materials, GAs usually are expected nuity. The present study ultralight, ultraflexible, anisotropic and highly therThe present demonstrates ultralight, highly thermally conductive graphenestudy aerogel films (GAFs). This high-temperature thermal expansion is expansion convenient access to the the tensile test This high-temperature thermal is convenient access to the unique oriented architectures of GAFs and attracts anisotropic thermal performances. Unique oriented 3D architectures of GAFs and attracts anisotropic thermal performances
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