Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 352, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.131066
Keywords
SMO-based chemiresistive gas; VOC sensor; Microstructure and operating condition; parameters; Sensing mechanism; Long-term stability; High throughput synthesis techniques; Exhaled breath and skin gas; VOC analysis
Funding
- Council of Scientific and Industrial Research, Government of India [MLP0308]
- Depart-ment of Science and Technology, Government of India (DST) [DST/MN/NT/2018/53 (G)]
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In this review, the significant effects of various parameters on the sensing behavior of semiconductor metal oxide (SMO) based chemiresistive gas sensors have been discussed in detail. The study systematically reviewed the impact of different material and operating condition aspects on the gas sensing performance of SMO sensors. The importance of long-term stability and high-throughput synthesis techniques in practical applications was emphasized, and the future prospects of SMO-based sensors in personalized healthcare were briefly outlined.
In this review, the different important parameters having significant effects on the sensing behavior of semiconductor metal oxide (SMO) based chemiresistive gas sensors have been discussed in details. Recently, SMO based chemiresistive sensors have shown immense potential in multifarious applications, especially human volatilome-based disease detection and health monitoring. In this work, we have selected some of the materials and operating condition aspects, viz. particle size and morphology, porosity, doping by noble metals and aliovalent ions, crystal phases and selectively exposed highly reactive crystalline planes, humidity, operating temperature, oxide heterojunction, homojunction and complex oxides, acid-base interaction between an oxide and a gas, gas molecule reformation inside sensing layer/ catalytic overlayer and interface gas filtration, light activation etc. and systematically reviewed their effects on the gas sensing performance of SMO sensors. From the perspective of practical applications, long-term stability, and high-throughput synthesis techniques have been elaborated. The future scope of the SMO-based breath and skin gas sensors in the upcoming area of skin mounted/wearable devices for personalized healthcare has been elucidated briefly. Finally, the discussions have been summarized with the major takeaways of this work.
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