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An Omni‐Healable and Highly Sensitive Capacitive Pressure Sensor with Microarray Structure
Author(s) -
Liu Feng,
Han Fei,
Ling Lei,
Li Jinhui,
Zhao Songfang,
Zhao Tao,
Liang Xianwen,
Zhu Deliang,
Zhang Guoping,
Sun Rong,
Ho Derek,
Wong ChingPing
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201803369
Subject(s) - capacitive sensing , pressure sensor , computer science , materials science , engineering , electrical engineering , mechanical engineering
Capacitive pressure sensors with high flexibility, sensitivity, and excellent healable properties are desirable for a wide variety of applications, such as e‐skin. However, implementing these characteristics onto a device presently remains a great challenge. In this work, a flexible pressure sensor with high sensitivity and strong healable properties has been developed based on healable polyurethane (HPU), silver nanowires and graphene. The HPU‐based microstructured capacitive pressure sensor exhibited a high sensitivity of 1.9 kPa −1 (<3 kPa), a fast response time (<100 ms), low detection limit (10 Pa), and long‐term durability (1000 cycles). Touch‐finger and vocal‐cord vibration detection have been demonstrated and exhibit a high sensitivity to both static and dynamic pressure. More notably, the entire pressure sensor including the dielectric layer and electrodes is omni‐healable after complete separation. The prototype has experimentally shown tremendous potential for wearable, healable applications, such as healthcare monitoring and human‐machine interfaces.