Visualization Recording and Storage of Pressure Distribution through a Smart Matrix Based on the Piezotronic Effect |
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| Authors: | Xun Han Weiming Du Mengxiao Chen Xiandi Wang Xiaojia Zhang Xiaoyi Li Jing Li Zhengchun Peng Caofeng Pan Zhong Lin Wang |
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| Affiliation: | 1. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology (NCNST), Beijing, P. R. China;2. College of Optoelectronic Engineering, Shenzhen University, Shenzhen, P. R. China;3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, USA |
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| Abstract: | Pressure sensors that can both directly visualize and record applied pressure/stress are essential for e‐skin and medical/health monitoring. Here, using a WO3‐film electrochromic device (ECD) array (10 × 10 pixels) and a ZnO‐nanowire‐matrix pressure sensor (ZPS), a pressure visualization and recording (PVR) system with a spatial resolution of 500 µm is developed. The distribution of external pressures can be recorded through the piezotronic effect from the ZPS and directly expressed by color changes in the ECD. Applying a local pressure can generate piezoelectric polarization charges at the two ends of the ZnO nanowires, which leads to the tuning of the current to be transported through the system and thus the color of the WO3 film. The coloration and bleaching process in the ECD component show good cyclic stability, and over 85% of the color contrast is maintained after 300 cycles. In this PVR system, the applied pressure can be recorded without the assistance of a computer because of the color memory effect of the WO3 material. Such systems are promising for applications in human‐electronic interfaces, military applications, and smart robots. |
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| Keywords: | electrochromic devices piezotronic effect pressure visualization, pressure recording ZnO nanowire arrays |
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