Zhang Yachu, Lin Han, Meng Fei, Liu Huai, Mesa David, Zhang Huihui, Huang Xiaodong, Lau Alan Kin Tak, Zhao Yuejin, Ma Tianyi, Jia Baohua
School of Electronic Engineering and Intelligentization, Dongguan University of Technology, Dongguan, 523808, Guangdong, China.
Centre for Translational Atomaterials, Faculty of Science, Engineering and Technology, Swinburne University of Technology, P. O. Box 218, Hawthorn, VIC 3122, Australia.
Nanoscale. 2021 Sep 23;13(36):15380-15393. doi: 10.1039/d1nr04333a.
Wearable and highly sensitive pressure sensors are of great importance for robotics, health monitoring and biomedical applications. For simultaneously achieving high sensitivity within a broad working range, fast response time (within a few milliseconds), minimal hysteresis and excellent cycling stability are critical for high performance pressure sensors. However, it remains a major challenge. Herein, we report a conceptual micro-cliff design of a graphene sensor with a record high sensitivity of up to 72 568 kPa in a broad working range of 0-255 kPa, which is one order of magnitude higher than the state-of-the-art reported sensitivity. In addition, the detection limit can be as low as 0.35 Pa and the fast response time is less than 5 ms. The sensor also has a minimal hysteresis and an outstanding cycling stability of 5000 cycles, all of which meet the requirements of an ideal pressure sensor. More interestingly, the micro-cliff graphene sensor is made by the fast and scalable flash reduction of graphene oxide using a single flashlight pulse within 150 ms and has been integrated into a wearable smart insole and an E-glove prototype for demonstration of health monitoring applications. This micro-cliff graphene pressure sensor achieves record-high sensitivity, which brings new possibilities in sensor research and promises broad applications.
可穿戴且高灵敏度的压力传感器对于机器人技术、健康监测和生物医学应用至关重要。为了在宽工作范围内同时实现高灵敏度，快速响应时间（几毫秒内）、最小滞后和出色的循环稳定性对于高性能压力传感器至关重要。然而，这仍然是一个重大挑战。在此，我们报告了一种石墨烯传感器的概念性微悬崖设计，在0 - 255 kPa的宽工作范围内具有高达72568 kPa的创纪录高灵敏度，比已报道的最先进灵敏度高一个数量级。此外，检测限可低至0.35 Pa，快速响应时间小于5 ms。该传感器还具有最小滞后和5000次循环的出色循环稳定性，所有这些都满足理想压力传感器的要求。更有趣的是，微悬崖石墨烯传感器是通过在150 ms内使用单个手电筒脉冲对氧化石墨烯进行快速且可扩展的闪速还原制成的，并已集成到可穿戴智能鞋垫和电子手套原型中，用于演示健康监测应用。这种微悬崖石墨烯压力传感器实现了创纪录的高灵敏度，为传感器研究带来了新的可能性，并有望得到广泛应用。
