Highly Sensitive and Selective Sensing of H2S Gas Using Precipitation and Impregnation-Made CuO/SnO2 Thick Films

Nanoscale Research Letters

Pimpan Leangtanom¹  Viruntachar Kruefu²  Sukon Phanichphant³  Anurat Wisitsoraat⁴  Adisorn Tuantranont⁴  Kata Jaruwongrangsee⁵  Narong Chanlek⁶ 

[1] Applied Chemistry Program, Faculty of Science, Maejo University, 50290, Chiang Mai, Thailand;Applied Chemistry Program, Faculty of Science, Maejo University, 50290, Chiang Mai, Thailand;Nanoscience and Nanotechnology Program, Faculty of Science, Maejo University, 50290, Chiang Mai, Thailand;Applied Physics Program, Faculty of Science, Maejo University, 50290, Chiang Mai, Thailand;Center of Advanced Materials for Printed Electronics and Sensors, Materials Science Research Center, Faculty of Science, Chiang Mai University, 50200, Chiang Mai, Thailand;National Security and Dual-Use Technology Center, National Science and Technology Development Agency, 12120, Klong Luang, Phathumthani, Thailand;Opto-Electrochemical Sensing Research Team (OEC), National Electronics and Computer Technology Center (NECTEC), 12120, Pathumthani, Thailand;Synchrotron Light Research Institute, 30000, Nakhon Ratchasima, Thailand;

关键词: Precipitation/impregnation;    CuO/SnO thick films;    Gas sensor;    Sensing mechanism;    Hydrogen sulfide;   

DOI  :  10.1186/s11671-021-03530-1

来源: Springer

【 摘 要 】

In this work, CuO-loaded tetragonal SnO2 nanoparticles (CuO/SnO2 NPs) were synthesized using precipitation/impregnation methods with varying Cu contents of 0–25 wt% and characterized for H2S detection. The material phase, morphology, chemical composition, and specific surface area of NPs were evaluated using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis. From gas-sensing data, the H2S responses of SnO2 NPs were greatly enhanced by CuO loading particularly at the optimal Cu content of 20 wt%. The 20 wt% CuO/SnO2 sensor showed an excellent response of 1.36 × 105 toward 10 ppm H2S and high H2S selectivity against H2, SO2, CH4, and C2H2 at a low optimum working temperature of 200 °C. In addition, the sensor provided fast response and a low detection limit of less than 0.15 ppm. The CuO–SnO2 sensor could therefore be a potential candidate for H2S detection in environmental applications.

【 授权许可】

CC BY