A review on chemiresistive ZnO gas sensors

• Published in: Sensors and actuators reports Vol. 4; p. 100100
• Main Authors: Franco, Mariane A., Conti, Patrick P., Andre, Rafaela S., Correa, Daniel S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2022; Elsevier
• Subjects: Chemiresistive sensors; Composites; Gas sensors; Heterojunction; Hybrid materials; ZnO; Chemiresistive sensors; Composites; ZnO; Gas sensors; Hybrid materials; Heterojunction
• ISSN: 2666-0539; 2666-0539
• DOI: 10.1016/j.snr.2022.100100

•Monitoring volatiles is fundamental for health and environmental areas.•Chemirestive sensors are a suitable tool for detecting varied analytes.•ZnO and its composites are potential for designing high performance chemiresistors.•We review distinct ZnO heterostructures applied in chemiresistive sensors. Chemiresistive gas sensors have been widely applied to monitor analytes of environmental, food and health importance. Among the plethora of materials that can be used for designing chemiresistive sensors, ZnO is one of the most explored for gas sensing, as this material has a low-cost, is non-toxic and can be easily obtained through standard chemical synthesis. Adding to this, ZnO can form heterostructures capable to improve sensor performance regarding sensitivity, selectivity and stability. Moreover, ZnO heterostructures also contribute to lower operating temperature of gas sensors, since the synergistic effects contribute to amplify the sensor signal. In this review, we survey recent advances on different types of chemiresistive ZnO-based gas sensors, focusing on how the morphology and structure of these materials influence on the sensor response. Challenges and future perspectives for ZnO chemiresistive sensors are also discussed. [Display omitted]