Hanlin Mu , Mingchun Li , Xiaohan Qu , Bingbing Jin , Kunlong Zhang , Yusheng Wu , Laishi Li
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Abstract
In practical applications, gas sensors with low working temperatures, high stability, and ultrasensitivity are required for real-time safety alerts and clinical diagnostics. In this study, a novel indium-poor phase three-dimensional (3D) In0.02W0.99O3/WO3 composite, self-assembled from unique inlaid-block nanosheets was prepared using a hydrothermal method. The presence of In0.02W0.99O3 promoted the growth of nanosheets along the (200) crystal plane. Sensors based on 3D In0.02W0.99O3/WO3 exhibited an excellent sensitivity of 119 to 10 ppm acetone at 100 ℃, which was 15 times greater than that of pure WO3. Moreover, the 3D In0.02W0.99O3/WO3-based sensors exhibited outstanding long-term stability. Characterization results showed that oxygen vacancies play a vital role in enhancing the gas-sensing performance of the prepared sensors. A synergistic mechanism between the high reactivity of the dangling W-atom bonds provided by the W-rich (200) crystal plane and the enriched oxygen vacancies was suggested. This study provides a new perspective on the selection of composite materials and the structural design of high-performance gas sensors for sub-ppm acetone detection at low working temperatures.
期刊介绍：
Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas:
• Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results.
• Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon.
• Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays.
• Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers.
Etc...
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