Wearable piezoresitive sensors have exhibited promising potentials for applications in motion detection and human-computer interactions. Herein, we reported a facile sol-gel followed by hydrothermal reduction approach to prepare polypyrrole/reduced graphite oxide aerogel (PPy@rGA) film, which is more oriented to flexible wearable piezoresistive sensors as compared with traditional cylindrical reduced graphene oxide (rGO) aerogel. The strong π-π interactions between rGO and PPy enhance the interfacial strength and help to maintain the integrity of the composite aerogel film. Meanwhile, the PPy nanoparticles anchoring on the edges and defects of rGO sheets create more electrically conductive paths when an external pressure is applied, and therefore give rise to significant changes in the resistance value and thus excellent piezoresistive sensing performance. The PPy2@rGA film (pyrrole monomer: graphene oxide is 2:1 wt%)–based piezoresistive sensor exhibits a high sensitivity of 0.9 kPa⁻¹ in a linear range that is of 0 to 1 kPa, a short response time of 165 ms, and a short relaxation time of 132 ms, and is able to withstand 10,000 cycles. Moreover, the wearable sensor is capable of detecting large as well as small human motion. This study shows the feasibility of fabricating wearable piezoresitive sensors from rGO aerogel films reinforced by intrinsically conductive polymers.

Graphical abstract

In this polypyrrole/reduced graphite oxide aerogel film which is more oriented to flexible wearable piezoresistive sensors, PPy nanoparticles anchor adjacent rGO sheets via strong π-π interfacial forces and meanwhile serve as nano-spacers that contribute to an enhanced piezoresistive sensing performance.

中文翻译：

---

聚吡咯/还原石墨烯气凝胶膜，用于可穿戴式压电传感器，具有较高的传感性能

可穿戴的压阻传感器在运动检测和人机交互中具有广阔的应用前景。本文中，我们报道了一种易用的溶胶-凝胶，然后采用水热还原法制备聚吡咯/还原的氧化石墨气凝胶（PPy @ rGA）膜，与传统的圆柱形氧化石墨烯（rGO）气凝胶相比，它更适合于柔性可穿戴压阻传感器。rGO和PPy之间的强π-π相互作用增强了界面强度，并有助于维持复合气凝胶薄膜的完整性。同时，当施加外部压力时，锚定在rGO片材边缘和缺陷上的PPy纳米颗粒会产生更多的导电路径，因此会引起电阻值的显着变化，并因此具有出色的压阻传感性能。基于PPy2 @ rGA膜（吡咯单体：氧化石墨烯为2：1 wt％）的压阻传感器显示出0.9 kPa的高灵敏度^-1在0到1 kPa的线性范围内，较短的响应时间为165 ms，较短的弛豫时间为132 ms，并且能够承受10,000个循环。此外，可穿戴传感器能够检测大大小小的人体运动。这项研究表明，用固有导电聚合物增强的rGO气凝胶薄膜制造可穿戴的压阻式传感器的可行性。

图形概要

在这种聚吡咯/还原的氧化石墨气凝胶膜中，这种膜更适合于柔性可穿戴的压阻传感器，PPy纳米颗粒通过强大的π-π界面力锚定相邻的rGO片，同时充当纳米间隔物，有助于增强压阻传感性能。