Mechanically robust honeycomb graphene aerogel multifunctional polymer composites
Mechanically robust honeycomb graphene aerogel multifunctional polymer composites
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DOI：
10.1016/j.carbon.2015.05.102
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发表时间：
2015-11
期刊：
影响因子：
10.9
通讯作者：
Qiangqiang Zhang;Xiang Xu;Hui Li;Guoping Xiong;Han Hu;T. Fisher
中科院分区：
文献类型：
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作者：
Qiangqiang Zhang;Xiang Xu;Hui Li;Guoping Xiong;Han Hu;T. Fisher
本文报道了石墨烯气凝胶（GA）-聚二甲基硅氧烷（PDMS）复合材料（GAPC）的制备和表征，该材料具有优异的力学、电学和热学性能。采用冰浴辅助浸渗和真空固化工艺，将PDMS浸渍到三维GA骨架上，制备了GAPC。由于三维遗传算法框架之间的良好连接，GAPC具有极大的变形能力（压缩应变= 80%，拉伸应变= 90%），高导电性和导热性（分别为1 S/cm和0.68 W/（m K））、稳定的压阻效应、快速的电焦耳加热性能（在12 W/cm 3的加热功率下（dT/dt）max> 3 °C/s），高疏水性（接触角= 135°）。此外，GAPC表现出负的温度膨胀系数，在很宽的温度范围内降低电阻率，表明典型的半导体行为和双重二维/三维跳跃导电机制。
This work reports the fabrication and characterization of three-dimensional (3D) graphene aerogel (GA)–polydimethylsiloxane (PDMS) composites (GAPC) with outstanding mechanical, electrical and thermal properties. GAPC was fabricated by impregnating 3D GA frameworks with PDMSviaice-bath-assisted infiltration and vacuum curing processes. Because of the well-interconnected 3D GA frameworks, GAPC exhibits extremely large deformability (compressive strain = 80% and tensile strain = 90%), high electrical and thermal conductivities (1 S/cm and 0.68 W/(m K), respectively), a stable piezo-resistance effect, rapid electric Joule heating performance ((dT/dt)max> 3 °C/s under a heating power of 12 W/cm3), and high hydrophobicity (contact angle = 135°). Furthermore, GAPC exhibits a negative temperature coefficient of expansion with decreased electrical resistivity over a broad temperature range, indicating a typical semiconducting behavior and a dual two-dimensional/3D hopping conduction mechanism.