MXene/rGO/PS spheres multiple physical networks as high-performance pressure sensor. (May 2022)

• Record Type: Journal Article
• Authors: Li, Li; Cheng, Yongfa; Cao, Honghao; Liang, Zhishen; Liu, Zunyu; Yan, Shuwen; Li, Luying; Jia, Shuangfeng; Wang, Jianbo; Gao, Yihua
• Is Part Of: Nano energy. Volume 95(2022)
• Publication Date: 2022-05
• Subjects: Pressure sensing -- Wearable sensor -- MXene/rGO aerogel -- Piezoresistive sponge -- Motion monitoring; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.106986
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Flexible wearable sensors can quantify and visualize the pressure, thus play important roles in practical applications such as medical monitoring, robotics, artificial skin, etc . High-porosity aerogel has excellent application potential in pressure sensor. However, aerogel is prone to irreversible deformation under long-term cycling pressure, which affects the performance of the sensor. How to balance high sensitivity and good cycle stability requires careful design of sensitive components. We propose a strategy to introduce the aerogel structure into the tiny sponge network, which greatly relieves the irreversible deformation and improves the long-cycle stability. A piezoresistive sponge (MGP-sponge) composed of triple morphological networks (MXene/rGO aerogel, PS spheres, and sponge) is obtained by electrostatic self-assembly, freeze-drying, and annealing. By filling the fragile MXene/rGO aerogel into sponge, the sensor could maintain more than 90% of initial sensitivity (224 kPa −1 ) after 15, 000 cycles. It has the advantages of fast response time (63 ms), sensing bending extent, etc . The working mechanism of the MGP-sponge is revealed by in situ FIB-SEM and first-principles calculations. MGP-sponge sensor performs excellently during various applications such as monitoring human activities, differentiating weights on a 2D array, controlling brightness of a LED sign, sensing manipulator finger motion, etc . Graphical Abstract: ga1 Highlights: Construction of a triple morphological 3D-networks for pressure sensing. The in-situ FIB-SEM observation and first-principles calculations reveal the working mechanism of the MGP-sponge. The MGP-sponge strikes a balance between high sensitivity and good stability. Various practical applications show the potential of MGP-sponge in pressure sensing devices.