Abstract
Even though several classes of materials have been investigated for chemical sensors applications, one-dimensional metal oxides (1D MOX) have considerable advantages. Especially, MOX nanowires (NWs) show physicochemical properties that allow them to overcome the drawbacks of traditional thick and thin film-based gas sensors such as low sensitivity and signal drifting due to the grain coalescence. As a result, nanosized 1D MOX are considered one of the best materials to fabricate new generation of chemical/gas sensors. This review attempts to collect the significant results achieved at SENSOR Lab, Brescia (Italy) on the synthesis of 1D MOX for chemical sensors applications. In particular, the bottom-up strategy to grow 1D MOXs (nanowires-like structures) mainly adopted by SENSOR Lab is the evaporation condensation technique. 1D MOX may be produced by using two different mechanisms, Vapor Liquid Solid (VLS) which employs a seed catalyst to assist the 1D growth and, Vapor Solid (VS). The synthesized nanowires are uniform, dense and have a high aspect ratio with diameters as low as few nanometers and length of tens of micrometers. Many gas sensors based on 1D MOX are produced including p-type semiconductors such as NiO and n-type such as ZnO, SnO2, WO3 and In2O3. They exhibit excellent sensitivity, high stability and fast response towards hazardous gases including toxic and flammable compounds such as NO2, NH3, acetone, ethanol and H2.
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Moumen, A., Kaur, N., Zappa, D., Comini, E. (2023). Evaporation Condensation Growth of One-Dimensional Metal Oxide at SENSOR Lab in Brescia for Chemical Sensors Applications. In: Di Francia, G., Di Natale, C. (eds) Sensors and Microsystems. AISEM 2021. Lecture Notes in Electrical Engineering, vol 918. Springer, Cham. https://doi.org/10.1007/978-3-031-08136-1_14
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