检出限
X射线光电子能谱
材料科学
扫描电子显微镜
氨
响应时间
分析化学(期刊)
工作温度
光电子学
化学
物理
核磁共振
热力学
计算机图形学(图像)
复合材料
色谱法
有机化学
计算机科学
作者
Cheng Huang,Weixin Liu,Ruiyang Chen,Bowen Tan,Muyan He,Renze Zhang,Botao Liu,Zhenyu Yuan
出处
期刊:IEEE Sensors Journal
[Institute of Electrical and Electronics Engineers]
日期:2022-12-15
卷期号:22 (24): 23610-23619
被引量:1
标识
DOI:10.1109/jsen.2022.3220824
摘要
In this article, four different light sources are utilized to enhance the WS2-based gas sensors properties, and the improvement effects of different light sources on the sensitive characteristics of the sensors are systematically analyzed. First, the WS2 nanomaterials are synthesized by hydrothermal method. In addition, the nanostructures and morphologies are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Finally, the effect of different temperatures and different ammonia concentrations on the sensor response is examined, including darkness, various light illumination (365, 532, 650, and 980 nm). Under dark conditions, the sensor response time is 46 s and recovery time is 55 s in 100-ppm ammonia gas, while the sensor has excellent selectivity for ammonia with a response of up to 81.84 times and only weak response for other gases. The results reveal that the four types of light are capable of reducing the operating temperature where the response value reach the peak. Meanwhile, the maximum response value is effectively increased, from a maximum value of 27 in the dark to a maximum value of 57 under light illumination. The 650-nm light illumination and the 980-nm light illumination exhibit the best effect on improving the response value. Therefore the 180 °C measured by the sensor response curve under 650-nm light conditions is defined as the optimal temperature. At the same time, light illumination can degrade the detection limit of the sensor. Under dark conditions, the ammonia detection limit of the sensor is 100 ppm, while under light illumination conditions, the ammonia detection limit of the sensor is 20 ppm.
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