Liu Zheng, Wang Qinsheng, Hou Linlin, Liu Yingjun, Li Zheng
Special Equipment Safety Supervision and Inspection Institute of Jiangsu Province, National Graphene Products Quality Inspection and Testing Center (Jiangsu), 330 Yanxin Road, Huishan, Wuxi 214174, China.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China.
Molecules. 2021 Nov 14;26(22):6867. doi: 10.3390/molecules26226867.
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 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.
石墨烯气凝胶作为一种有前途的用于各种应用的材料已引起广泛关注。单个石墨烯片异常高的本征热导率与组装的3D石墨烯材料的隔热性能形成明显对比。我们报道了使用热膨胀法由紧密堆积的石墨烯膜制备各向异性3D石墨烯气凝胶薄膜（GAFs）。获得了具有不同厚度且最终密度低至4.19 mg/cm³的GAFs。GAFs在平均跨平面热导率（K）和平均面内热导率（K）方面表现出高各向异性。此外，由于石墨烯层的Z形折叠，单轴压缩的GAFs表现出11.76%的大伸长率。我们的结果揭示了超轻、超柔韧、高导热、各向异性的GAFs，以及宏观组装石墨烯材料在高温下的基本演变。
