Metal–organic framework-derived porous TiO2 nanotablets with sensitive and selective ethanol sensing
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Porous TiO2 nanotablets were fabricated by calcining the MIL-125 metal–organic framework (MOF) precursors formed by a solvothermal method. Sensing results indicated that this kind of MOF-derived TiO2 nanotablets exhibited excellent ethanol sensing properties, including high response (46.12–500 ppm), relatively low operating temperature (250 °C), and low detection limit (0.417 ppm). The response of TiO2 nanotablets to 500 ppm ethanol at 250 °C was about 4.18 times higher than that of commercial TiO2 powder at the optimum operating temperature of 275 °C. Moreover, TiO2 nanotablets also displayed high stability and ethanol selectivity. The special porous structure, high valence state of absorbed oxygen species, and formation of rutile–anatase n–n junctions can enhance the resistance modulation of MOF-based TiO2 nanotablets, contributing to their excellent ethanol sensing properties.
This work was supported by the National Natural Science Foundation of China (Nos. 11574189, 11604196, and 11604252), the Science and Technology Program of Shaanxi Province (Nos. 2019JM-102, 2016KJXX-15, and 2017JQ1015), the Fundamental Research Funds for the Central Universities (Nos. GK201602006, GK201801005, and 2018CBLZ002), and the Start-Up Funds of Xi’an Polytechnic University (No. BS15026).
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