Document Type
Article
Abstract
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 for sensing 75 ppm ammonia gas, respectively. The experimental results prove that under the optimized heating temperature of about 70 °C the heaters successfully help implement complete desorption of residual NH₃ showing a good sensitivity and cyclic stability.
Digital Object Identifier (DOI)
Publication Info
Published in Sensors (Basel, Switzerland), Volume 18, Issue 12, 2018, pages 4405-.
APA Citation
Wu, D., Peng, Q., Wu, S., Wang, G., Deng, L., Tai, H., Wang, L., Yang, Y., Dong, L., Zhao, Y., Zhao, J., Sun, D., & Lin, L. (2018). A Simple Graphene NH3 Gas Sensor via Laser Direct Writing. Sensors, 18(12), 4405.https://doi.org/10.3390/s18124405
Rights
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/) .