Highly pressure-sensitive graphene sponge fabricated by γ-ray irradiation reduction  

γ-射线辐照法制备具有良好应力检测灵敏度的石墨烯海绵材料（英文）

作　　者：Tiezhu Zhang Tao Wang Yali Guo Yiheng Zhai Aiqin Xiang Xuewu Ge Xianghua Kong Hangxun Xu Hengxing Ji 张铁柱;汪韬;郭亚丽;翟毅恒;项爱琴;葛学武;孔祥华;徐航勋;季恒星

机构地区：[1]School of Chemistry and Chemical Engineering, Hefei University of Technology [2]CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China [3]Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China

出　　处：《Science China Materials》2018年第12期1596-1604,共9页中国科学（材料科学（英文版）

基　　金：the National Natural Science Foundation of China(21503064);Anhui Provincial Natural Science Foundation for support(1508085QE103);the Ministry of Science and Technology of China(2015CB351903);the 100 Talents Program of the Chinese Academy of Sciences,USTC Startup;the Fundamental Research Funds for the Central Universities(WK2060140003);iChEM

摘　　要：Graphene sponge(GS) with microscale size, high mechanical elasticity and electrical conductivity has attracted great interest as a sensing material for piezoresistive pressure sensor. However, GS offering a lower limit of pressure detection with high gauge factor, which is closely dependent on the mechanical and electrical properties and determined by the fabrication process, is still demanded. Here, γ-ray irradiation reduced GS is reported to possess a gauge factor of 1.03 kPa^–1 with pressure detection limit of 10 Pa and high stress retention of 76% after 800 cycles of compressing/relaxation at strain of 50%. Compared with the carbon nanotube(CNT) reinforced GS, the improved lower limit of pressure detection and gauge factor of the GS prepared by γ-ray irradiation is due to the low compression stress(0.9 kPa at stain of 50%). These excellent physical properties of the GS are ascribed to the mild,residual free, and controllable reduction process offered by γ-ray irradiation.石墨烯海绵具有优异的机械弹性和电导率,其电导率在石墨烯片相互交联形成的多孔结构被压缩和释放的过程中会发生可逆变化,因此可作为压阻传感器的敏感材料.然而,由于制备方法的限制使得目前报道的石墨烯海绵的压缩模量较大,在检测低应力时材料的电导率变化不明显,导致压阻传感器的灵敏度和检测限不足.本文利用γ射线辐照还原法提供的温和、清洁的还原条件,制备了压缩模量低的石墨烯海绵.其作为压敏传感器的敏感材料,实现了应变灵敏度系数为1.03 kPa-1,检测限低至10 Pa、机械稳定性优异(在50%应变下800次循环最大应力保持76%)的压阻传感器.

关 键 词：graphene sponge piezoresistive pressure sensor γ-ray irradiation 

分 类 号：TQ127.11[化学工程—无机化工]