Sensors, Vol. 18, Pages 4337: A Fast Response −Recovery 3D Graphene Foam Humidity Sensor for User Interaction
Sensors, Vol. 18, Pages 4337: A Fast Response−Recovery 3D Graphene Foam Humidity Sensor for User Interaction
Sensors doi: 10.3390/s18124337
Authors:
Yu Yu
Yating Zhang
Lufan Jin
Zhiliang Chen
Yifan Li
Qingyan Li
Mingxuan Cao
Yongli Che
Junbo Yang
Jianquan Yao
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.
Source: Sensors - Category: Biotechnology Authors: Yu Yu Yating Zhang Lufan Jin Zhiliang Chen Yifan Li Qingyan Li Mingxuan Cao Yongli Che Junbo Yang Jianquan Yao Tags: Article Source Type: research