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Sensors 2018, 18(12), 4337;

A Fast Response−Recovery 3D Graphene Foam Humidity Sensor for User Interaction

Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen 518055, China
Key Laboratory of Opto-Electronics Information Technology, Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
Center of Material Science, National University of Defense Technology, Changsha 410073, China
Author to whom correspondence should be addressed.
Received: 9 October 2018 / Revised: 1 December 2018 / Accepted: 3 December 2018 / Published: 8 December 2018
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Humidity sensors allow electronic devices to convert the water content in the environment into electronical signals by utilizing material properties and transduction techniques. Three-dimensional graphene foam (3DGF) can be exploited in humidity sensors due to its convenient features including low-mass density, large specific surface area, and excellent electrical. In this paper, 3DGF with super permeability to water enables humidity sensors to exhibit a broad relative humidities (RH) range, from 0% to 85.9%, with a fast response speed (response time: ~89 ms, recovery time: ~189 ms). To interpret the physical mechanism behind this, we constructed a 3DGF model decorated with water to calculate the energy structure and we carried out the CASTEP as implemented in Materials Studio 8.0. This can be ascribed to the donor effect, namely, the electronic donation of chemically adsorbed water molecules to the 3DGF surface. Furthermore, this device can be used for user interaction (UI) with unprecedented performance. These high performances support 3DGF as a promising material for humidity sensitive material. View Full-Text
Keywords: three-dimensional graphene foams; humidity sensor; fast response; user interaction three-dimensional graphene foams; humidity sensor; fast response; user interaction

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Yu, Y.; Zhang, Y.; Jin, L.; Chen, Z.; Li, Y.; Li, Q.; Cao, M.; Che, Y.; Yang, J.; Yao, J. A Fast Response−Recovery 3D Graphene Foam Humidity Sensor for User Interaction. Sensors 2018, 18, 4337.

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