Ultrathin Glass-Based Flexible, Transparent, and Ultrasensitive Surface Acoustic Wave Humidity Sensor with ZnO Nanowires and Graphene Quantum Dots

Wu, Jianhui, Yin, Changshuai, Zhou, Jian, Li, Honglang, Liu, Yi, Shen, Yiping, Garner, Sean, Fu, Richard and Duan, Huigao (2020) Ultrathin Glass-Based Flexible, Transparent, and Ultrasensitive Surface Acoustic Wave Humidity Sensor with ZnO Nanowires and Graphene Quantum Dots. ACS Applied Materials & Interfaces, 12 (35). pp. 39817-39825. ISSN 1944-8244

[img] Text
NRL_44254.pdf - Accepted Version
Restricted to Repository staff only until 10 August 2021.

Download (1MB) | Request a copy
Official URL: https://doi.org/10.1021/acsami.0c09962

Abstract

Flexible electronic devices are normally based on organic polymer substrate. In this work, an ultrathin glass-based flexible, transparent, and ultrasensitive ZnO/glass surface acoustic wave (SAW) humidity sensor is developed using a composite sensing layer of ZnO nanowires (NWs) and graphene quantum dots (GQDs). It shows much larger effective electromechanical coupling coefficients and signal amplitudes, compared to those of flexible polymer-based SAW devices reported in the literature. Attributed to large specific surface areas of ZnO NWs, large numbers of hydrophilic functional groups of GQDs, as well as the formation of p–n heterojunctions between GQDs and ZnO NWs, the developed ZnO/glass flexible SAW sensor shows an ultrahigh humidity sensitivity of 40.16 kHz/% RH, along with its excellent stability and repeatability. This flexible and transparent SAW sensor has demonstrated insignificant deterioration of humidity sensing performance, when it is bent on a curved surface with a bending angle of 30°, revealing its potential applications for sensing on curved and complex surfaces. The humidity sensing and human breathing detection have further been demonstrated for wearable electronic applications using ultrathin glass-based devices with completely inorganic materials.

Item Type: Article
Uncontrolled Keywords: flexible glass ZnO flexible SAW ZnO NWs and GQDs humidity sensors
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 24 Sep 2020 15:06
Last Modified: 24 Sep 2020 15:15
URI: http://nrl.northumbria.ac.uk/id/eprint/44254

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics