期刊
SENSORS
卷 18, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/s18124405
关键词
ammonia gas sensor; graphene; laser direct writing
资金
- Training program of Key Research Plan of National Science Foundation of China [91648114]
- fundamental Research Funds for the Central Universities of China (Xiamen University) [20720170037]
- Key Research and Development Plan Project of Zhejiang Province [2018C01036]
Ammonia gas sensors are very essential in many industries and everyday life. However, their complicated fabrication process, severe environmental fabrication requirements and desorption of residual ammonia molecules result in high cost and hinder their market acceptance. Here, laser direct writing is used to fabricate three parallel porous 3D graphene lines on a polyimide (PI) tape to simply construct an ammonia gas sensor. The middle one works as an ammonia sensing element and the other two on both sides work as heaters to improve the desorption performance of the sensing element to ammonia gas molecules. The graphene lines were characterized by scanning electron microscopy and Raman spectroscopy. The response and recovery time of the sensor without heating are 214 s and 222 s with a sensitivity of 0.087% ppm(-1) for sensing 75 ppm ammonia gas, respectively. The experimental results prove that under the optimized heating temperature of about 70 degrees C the heaters successfully help implement complete desorption of residual NH3 showing a good sensitivity and cyclic stability.
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