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Ultrasensitive and Stretchable Strain Sensors Based on Mazelike Vertical Graphene Network
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-09-26 00:00:00 , DOI: 10.1021/acsami.8b15848 Shuying Wu 1 , Shuhua Peng 1 , Zhao Jun Han 2 , Hongwei Zhu 3 , Chun H. Wang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-09-26 00:00:00 , DOI: 10.1021/acsami.8b15848 Shuying Wu 1 , Shuhua Peng 1 , Zhao Jun Han 2 , Hongwei Zhu 3 , Chun H. Wang 1
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Here, we report a new type of strain sensors consisting of vertical graphene nanosheets (VGNs) with mazelike network, sandwiched between poly(dimethylsiloxane) (PDMS) substrates. The new sensors outperform most graphene thin-film-based sensors reported previously and show an outstanding combination of high stretchability of ∼120%, excellent linearity over the entire detection range, and high sensitivity with a gauge factor of ∼32.6. The sensitivity can be tuned by controlling the thickness of VGNs, with sensors consisting of thicker VGNs showing higher sensitivity but slightly lower stretchability (the maximum gauge factor is ∼88.4 with a maximum detection strain of ∼55%). Detailed microscopic examinations reveal that the ultrahigh sensitivity stems from the formation of microcracks initiated in the buffer layer. These microcracks are bridged by strings of graphene/PDMS, enabling the conductive network to continue to function up to a strain level significantly higher than that of previously reported graphene thin-film-based sensors. Furthermore, the present sensors have been found to be insensitive to temperatures and various liquids, including water and 0.1 mol L–1 sodium chloride solution (similar to the sweat on human skin). Demonstrations are presented to highlight the new sensors’ potential as wearable devices for human motion detection and pressure distribution measurement.
中文翻译：
基于迷宫状垂直石墨烯网络的超灵敏可拉伸应变传感器
在这里，我们报告了一种新型的应变传感器，该传感器由具有迷宫状网络的垂直石墨烯纳米片（VGN）夹在聚（二甲基硅氧烷）（PDMS）基板之间构成。新型传感器的性能优于先前报道的大多数基于石墨烯薄膜的传感器，并具有出色的组合性能，可达到120％的高可拉伸性，在整个检测范围内均具有出色的线性度以及高达32.6的规格系数的高灵敏度。可以通过控制VGN的厚度来调节灵敏度，传感器由较厚的VGN组成，传感器显示出更高的灵敏度，但拉伸性略低（最大规格系数为〜88.4，最大检测应变为〜55％）。详细的显微镜检查表明，超高灵敏度源自缓冲层中引发的微裂纹的形成。这些微裂纹被一系列石墨烯/ PDMS桥接，使导电网络能够继续发挥作用，直至其应变水平明显高于先前报道的基于石墨烯薄膜的传感器。此外，已经发现本传感器对温度和各种液体，包括水和0.1mol L不敏感。–1氯化钠溶液（类似于人类皮肤上的汗水）。演示旨在突出新传感器作为人体运动检测和压力分布测量的可穿戴设备的潜力。
更新日期：2018-09-26
中文翻译：
基于迷宫状垂直石墨烯网络的超灵敏可拉伸应变传感器
在这里，我们报告了一种新型的应变传感器，该传感器由具有迷宫状网络的垂直石墨烯纳米片（VGN）夹在聚（二甲基硅氧烷）（PDMS）基板之间构成。新型传感器的性能优于先前报道的大多数基于石墨烯薄膜的传感器，并具有出色的组合性能，可达到120％的高可拉伸性，在整个检测范围内均具有出色的线性度以及高达32.6的规格系数的高灵敏度。可以通过控制VGN的厚度来调节灵敏度，传感器由较厚的VGN组成，传感器显示出更高的灵敏度，但拉伸性略低（最大规格系数为〜88.4，最大检测应变为〜55％）。详细的显微镜检查表明，超高灵敏度源自缓冲层中引发的微裂纹的形成。这些微裂纹被一系列石墨烯/ PDMS桥接，使导电网络能够继续发挥作用，直至其应变水平明显高于先前报道的基于石墨烯薄膜的传感器。此外，已经发现本传感器对温度和各种液体，包括水和0.1mol L不敏感。–1氯化钠溶液（类似于人类皮肤上的汗水）。演示旨在突出新传感器作为人体运动检测和压力分布测量的可穿戴设备的潜力。
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