Author(s): Zhang, YP (Zhang, Yupu); Wang, LL (Wang, Lili); Zhao, LJ (Zhao, Lianjia); Wang, K (Wang, Kang); Zheng, YQ (Zheng, Yiqiang); Yuan, ZY (Yuan, Zeyu); Wang, DY (Wang, Dongyi); Fu, XY (Fu, Xiyao); Shen, GZ (Shen, Guozhen); Han, W (Han, Wei)

Source: ADVANCED MATERIALS Article Number: 2007890 DOI: 10.1002/adma.202007890 Early Access Date: APR 2021

Abstract: Accurate and continuous detection of physiological signals without the need for an external power supply is a key technology for realizing wearable electronics as next-generation biomedical devices. Herein, it is shown that a MXene/black phosphorus (BP)-based self-powered smart sensor system can be designed by integrating a flexible pressure sensor with direct-laser-writing micro-supercapacitors and solar cells. Using a layer-by-layer (LbL) self-assembly process to form a periodic interleaving MXene/BP lamellar structure results in a high energy-storage capacity in a direct-laser-writing micro-supercapacitor to drive the operation of sensors and compensate the intermittency of light illumination. Meanwhile, with MXene/BP as the sensitive layer in a flexible pressure sensor, the pressure sensitivity of the device can be improved to 77.61 kPa(-1) at an optimized elastic modulus of 0.45 MPa. Furthermore, the smart sensor system with fast response time (10.9 ms) shows a real-time detection capability for the state of the human heart under physiological conditions. It is believed that the proposed study based on the design and integration of MXene materials will provide a general platform for next-generation self-powered electronics.

Accession Number: WOS:000643568000001

PubMed ID: 33899274

ISSN: 0935-9648

eISSN: 1521-4095

Full Text: https://onlinelibrary.wiley.com/doi/10.1002/adma.202007890