Elastic loading enhanced NH3 sensing for surface acoustic wave sensor with highly porous nitrogen doped diamond like carbon film

Zhu, Hao, Xie, Dong, Lin, Sixu, Zhang, Wenting, Yang, Youwei, Zhang, Ruijie, Shi, Xing, Wang, Hongyan, Zhang, Zhengquan, Zu, Xiaotao, Fu, Richard and Tang, Yongliang (2021) Elastic loading enhanced NH3 sensing for surface acoustic wave sensor with highly porous nitrogen doped diamond like carbon film. Sensors and Actuators B: Chemical, 344. p. 130175. ISSN 0925-4005

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Official URL: https://doi.org/10.1016/j.snb.2021.130175

Abstract

We proposed a surface acoustic wave (SAW) NH3 gas sensor based on nitrogen doped diamond like carbon (N-DLC) film. The N-DLC film, prepared using a microwave electron cyclotron resonance plasma chemical vapor deposition (ECR-PECVD) method, is highly porous and physically and chemically stable, and have active polar groups on its surface, which can selectively absorb polar NH3 gas molecules. These features of the film lead to the high sensitivity, low noise and excellent stability of the sensor. The sensor can achieve capabilities of in-situ monitoring NH3 in a concentration range from 100 ppb to 100 ppm with fast response (∼5 s) and recovery (∼29 s) at room temperature. The NH3 sensing mechanism is attributed to the decreased porosity of the N-DLC film caused by adsorbed NH3 molecules on its polar groups, which leads an increase of the elastic modulus of the film.

Item Type: Article
Uncontrolled Keywords: N doped DLC, Surface acoustic wave (SAW), NH3 gas sensor, Elastic modulus
Subjects: H600 Electronic and Electrical Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 16 Jun 2021 08:32
Last Modified: 16 Jun 2021 08:45
URI: http://nrl.northumbria.ac.uk/id/eprint/46454

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