Ultra-sensitive piezo-resistive sensors constructed with reduced graphene oxide/Polyolefin elastomer (RGO/POE) nanofiber aerogels
Ultra-sensitive piezo-resistive sensors constructed with reduced graphene oxide/Polyolefin elastomer (RGO/POE) nanofiber aerogels
复制标题
采用还原氧化石墨烯/聚烯烃弹性体 (RGO/POE) 纳米纤维气凝胶构建的超灵敏压阻传感器
DOI：
10.3390/polym11111883
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发表时间：
2019
期刊：
影响因子：
5
通讯作者：
Wang Dong
中科院分区：
文献类型：
--
作者：
Zhong Weibing;Jiang Haiqing;Yang Liyan;Yadav Ashish;Ding Xincheng;Chen Yuanli;Li Mufang;Sun Gang;Wang Dong
柔性可穿戴压力传感器在健康管理、仿人机器人、人机界面等领域具有广阔的应用前景，近年来受到广泛关注。在众多传感性能中，高灵敏度是柔性传感器实用化的基本要求。因此，许多研究致力于提高柔性压力传感器的灵敏度。纤维组件被认为是高灵敏度压阻式传感器的理想基板，因为其三维多孔结构可以很容易地压缩，并可以提供高互连的导电元件。此外，它有望通过提高纤维组件的孔隙率来实现高灵敏度。本文以氧化石墨烯(GO)/POE纳米纤维复合气凝胶为原料，采用冷冻干燥法制备了三维还原氧化石墨烯/聚烯烃弹性体(RGO/POE)纳米纤维复合气凝胶。研究发现，热塑性POE纳米纤维在还原过程中的体积收缩提高了复合气凝胶的压缩机械强度，但降低了气凝胶的感度。因此，制备了不同POE纳米纤维用量的复合气凝胶，以平衡灵敏度和工作压力范围。结果表明，POE纳米纤维与氧化锌的比例为3：3的复合气凝胶具有较高的感度(约223kPa−1)和较高的工作压力(0~17.7kPa)。此外，无论是以不同的频率压缩，还是可逆压缩释放5000次，复合气凝胶都表现出很强的稳定性。
Flexible wearable pressure sensors have received extensive attention in recent years because of the promising application potentials in health management, humanoid robots, and human machine interfaces. Among the many sensory performances, the high sensitivity is an essential requirement for the practical use of flexible sensors. Therefore, numerous research studies are devoted to improving the sensitivity of the flexible pressure sensors. The fiber assemblies are recognized as an ideal substrate for a highly sensitive piezoresistive sensor because its three-dimensional porous structure can be easily compressed and can provide high interconnection possibilities of the conductive component. Moreover, it is expected to achieve high sensitivity by raising the porosity of the fiber assemblies. In this paper, the three-dimensional reduced graphene oxide/polyolefin elastomer (RGO/POE) nanofiber composite aerogels were prepared by chemical reducing the graphene oxide (GO)/POE nanofiber composite aerogels, which were obtained by freeze drying the mixture of the GO aqueous solution and the POE nanofiber suspension. It was found that the volumetric shrinkage of thermoplastic POE nanofibers during the reduction process enhanced the compression mechanical strength of the composite aerogel, while decreasing its sensitivity. Therefore, the composite aerogels with varying POE nanofiber usage were prepared to balance the sensitivity and working pressure range. The results indicated that the composite aerogel with POE nanofiber/RGO proportion of 3:3 was the optimal sample, which exhibits high sensitivity (ca. 223 kPa−1) and working pressure ranging from 0 to 17.7 kPa. In addition, the composite aerogel showed strong stability when it is either compressed with different frequencies or reversibly compressed and released 5000 times.