Novel Selectivity: Target of Gas Sensing Defined by Behavior,Advanced Materials

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Novel Selectivity: Target of Gas Sensing Defined by Behavior
Advanced Materials ( IF 27.4 ) Pub Date : 2024-12-20 , DOI: 10.1002/adma.202413023
Lei Miao, Peng Song, Yibei Xue, Zhufeng Hou, Takuya Hasegawa, Ayahisa Okawa, Tomoyo Goto, Yeongjun Seo, Ryo Maezono, Tohru Sekino, Shu Yin

Traditional selectivity of gas sensors determined by the magnitude of the response value has significant limitations. The distinctive inversion sensing behavior not only defies the traditional sensing theory but also provides insight into defining selectivity. Herein, the novel definition of selectivity is established in a study with VO2(M1). The sensing behavior of VO2(M1) is investigated after its synthesis conditions optimization by machine learning. In gases of the same nature, VO2(M1) shows remarkably selective for NH3 marked with unique resistance increase behavior. Such anomalous behavior is attributed to the formation of the Schottky junction between VO2(M1) and the electrode. The “work function‐electron affinity” relation is summarized as the selectivity coefficient, a parameter for predicting the selectivity of the sensing material effectively.

更新日期：2024-12-20

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