Zinc Oxide Thin Film Prepared by Micro-Dropping Chemical Method on QCM for Gas Sensing

Abstract

The paper presents fabrication and characterization of ZnO coated on a quartz crystal microbalance for gas sensing at room temperature. The ZnO thin films were chemically deposited as sensitive layer on the top of the QCM by micro-dropping technique. The morphology of the coated thin film was examined by scanning electron microscopy and X-ray diffraction in order to analyze the crystalline nature of the structure. The ZnO coated on a quartz crystal microbalance sensor showed a good sensitivity to the gases tested: ethanol, acetone, and humidity. High sensitivity was obtained for ethanol vapor more than acetone, with good reproducibility and stability of the sensor when exposed to different concentrations given respectively 50, 100, 200 ppm. The influence of humidity was examined under different relative humidity. The results indicate that the ZnO coated on a QCM shows a high response and fast response/recovery characteristics under humidity comparing to ethanol and acetone vapor.

Overall perspective of electrospun semiconductor metal oxides as high-performance gas sensor materials for NOx detection

“…They found that the response of nanober based NO 2 sensors at 350 °C was higher and faster, however, they did not mention recovery/ response time in their study which needs to be investigated. Further investigation demonstrated that the response of ZnO nanober gas sensors can be increased by doping, 106,107 heterojunction fabrication, 108 and noble metal decoration. 106 In the specic context of NO 2 gas detection, a study examined ZnO-SnO 2 hollow composite nanobers with varying Zn ratios, leading to the synthesis of distinct materials evaluated for gas-sensing capabilities.…”

“…Further investigation demonstrated that the response of ZnO nanober gas sensors can be increased by doping, 106,107 heterojunction fabrication, 108 and noble metal decoration. 106 In the specic context of NO 2 gas detection, a study examined ZnO-SnO 2 hollow composite nanobers with varying Zn ratios, leading to the synthesis of distinct materials evaluated for gas-sensing capabilities. 109 Demonstrating real-time sensing responses for ZnO-SnO 2 composites in Fig.…”

“…They found that the response of nanofiber based NO 2 sensors at 350 °C was higher and faster, however, they did not mention recovery/response time in their study which needs to be investigated. Further investigation demonstrated that the response of ZnO nanofiber gas sensors can be increased by doping, 106,107 heterojunction fabrication, 108 and noble metal decoration. 106…”

“…Further investigation demonstrated that the response of ZnO nanofiber gas sensors can be increased by doping, 106,107 heterojunction fabrication, 108 and noble metal decoration. 106…”

Quartz Crystal Microbalance Sensor Based on ZnO-Graphene Thin Film for Gas Detection

“…Gas sensing devices have an important role in many areas, from healthcare to industrial and environmental monitoring [1][2][3][4][5]. A quartz crystal microbalance (QCM) has been widely used as a highly sensitive device that can detect small changes in mass at room temperature, making it an excellent platform for gas-sensing applications [6]. The key to developing a QCM sensor is the choice of sensitive coating materials that interact with specific analytes effectively [7,8].…”