Oxalis-inspired, two-stage interlocking of bionic micro-jigsaw structure in laser-induced graphene based pressure sensor

• Published in: IEEE sensors journal 2024-12, p.1-1
• Main Authors: Wang, Wentao, Chen, Ziqiang, Deng, Zeping, Sun, Jiyuan, Yan, Yixiong
• Format: Article
• Language: English
• Subjects: Bionic structure; Electrodes; Graphene; Laser beam cutting; Laser-induced graphene; Mirco-jigsaw structure; Oxalis-inspired; Power lasers; Pressure sensor; Pressure sensors; Sensitivity; Sensors; Three-dimensional printing; Wireless sensor networks
• ISSN: 1530-437X
• DOI: 10.1109/JSEN.2024.3503902

Achieving high sensitivity over a wide response range is a major challenge for pressure sensors. Inspired by the unique geometry of natural oxalis leaves, we here propose a novel approach includes pre-etching, growth, and transfer process to fabricate laser-induced graphene (LIG) with a two-stage (e.g., mirco-jigsaw, micro-pore) structure. Experimentally, the oxalis-inspired pressure sensor exhibits a balanced sensitivity and response range (sensitivity of 15.8 kPa -1 in a linearity range of 0.5−5 kPa), due to the piezoresistive synergistic effects of two-stage structures. The mechanical interlocking between outer mirco-jigsaw structures initiates huge resistance changes; whereas the inner shape-adaptive micro-pore structure plays a buffer role in the dynamic deformation, enabling reversible resilience over a wide working range. In combination with a self-developed all-in-one wireless transmission system, the oxalis-inspired pressure sensor is further assembled to monitor various health parameters such as tiny pulse, heartbeat, and voice, revealing a huge prospect in future wearable electronics.