review · Rare Metals
Chemo-resistive gas sensors using metal oxide nanostructures like zinc oxide, tin dioxide, indium oxide, and iron oxide benefit from modifications with metals and noble metals. Doping with metals such as aluminium, iron, and copper, as well as decorating with noble metals including palladium, platinum, and gold, enhances gas sensing performance. Bimetallic modifications offer superior advantages over single-metal treatments. Beyond traditional heating modes, composite structural materials combining perovskites and metal oxides present distinct results and ongoing challenges for room-temperature detection. These modified sensing materials can be integrated into micro-electro-mechanical system sensing arrays and electronic nose smart sensing devices. Such advanced hardware addresses needs across environmental monitoring, food testing, and medical diagnostics, though implementation faces limitations that influence trends in fields like smart home automation.
Gas sensors are critical for detecting harmful emissions, ensuring food safety, and identifying disease markers. Refining sensing materials using metals, noble metals, and composite structures allows devices to operate more effectively, potentially at room temperature. Improving these core technologies supports the development of compact, intelligent tools such as electronic noses and automated monitoring systems for public health, safety, and domestic environments.
The underlying technology supports applications in disease diagnosis, environmental safety, food testing, and smart home appliances. Potential users include medical diagnostic developers, environmental monitoring agencies, and smart home device manufacturers. As an assessment evaluating material synthesis, room-temperature detection challenges, and device architectures like micro-electro-mechanical system arrays, the field spans early-stage material research to developing electronic nose sensing systems facing practical performance limitations.
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Abstract Highly sensitive gas sensors play an important role in applications, such as environmental monitoring, medical diagnostics and food testing. This paper reviews recent advances in metal‐doped and noble metal‐decorated chemo‐resistive gas sensors with different nanostructures (ZnO, SnO 2 , In 2 O 3 and Fe 2 O 3 ). It mainly includes the doping of metals such as Al, Fe and Cu, and the modification of noble metals such as Pd, Pt and Au, and introduces the bimetallic‐modified materials possessing greater advantages than single metals in enhancing gas‐sensitive performance. The results and problems of room‐temperature detection of perovskite and metal oxide composite structural materials are also discussed. In addition, the potential applications of micro‐electro‐mechanical system (MEMS) gas sensing arrays and electronic nose smart sensing devices in disease diagnosis and environmental monitoring are presented through their limitations and development trends in areas such as smart homes. Finally, the main challenges and future prospects of metal oxide gas sensors are presented.
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DOI: 10.1007/s12598-024-03027-7
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