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http://dx.doi.org/10.46670/JSST.2021.30.4.210

α-Fe2O3 nanostructure-based gas sensors  

Lee, Seonyong (Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University)
Jang, Ho Won (Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University)
Publication Information
Journal of Sensor Science and Technology / v.30, no.4, 2021 , pp. 210-217 More about this Journal
Abstract
Gas sensors based on semiconducting metal oxides have attracted considerable attention for various applications owing to their facile, cheap, and small-scale manufacturing processes. Hematite (α-Fe2O3) is widely considered as a promising candidate for a gas-sensing material owing to not only its abundance in the earth's crust and low price but also its chemical stability and suitable bandgap energy. However, only a few studies have been performed in this direction because of the low gas response and sluggish response of hematite-based gas sensors. Nanostructures present a representative solution to both overcome these disadvantages and exploit the desirable features to produce high-performance gas sensors. However, several challenges remain for adopting gas sensors based on metal oxide nanostructures, such as improving cost efficiency and facilitating mass production. This review summarizes the recent studies on gas sensors based on hematite nanostructures. It also provides useful insights into various strategies for enhancing the gas-sensing properties of gas sensors based on hematite nanostructures.
Keywords
Gas sensor; Hematite; Nanostructure; Oxide semiconductor;
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