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Synthesis of MoO3/WO3 composite nanostructures for highly sensitive ethanol and acetone detection

Sun, Yongjiao, Chen, Lin, Wang, Ying, Zhao, Zhenting, Li, Pengwei, Zhang, Wendong, Leprince-Wang, Yamin, Hu, Jie
Journal of materials science 2017 v.52 no.3 pp. 1561-1572
acetone, detection limit, ethanol, molybdenum, nanomaterials, scanning electron microscopy, temperature, tungsten oxide
In this paper, different contents of molybdenum oxide/tungsten oxide (MoO₃/WO₃) composite nanostructures were synthesized by hydrothermal method. Field emission scanning electron microscopy images revealed that the morphologies of WO₃ nanostructures were significantly influenced by the Mo amount. Furthermore, the introduction strategy of MoO₃ into WO₃ could effectively improve the gas sensing properties. Especially, the sensor based on the 4 mol% MoO₃/WO₃ composite nanostructures exhibited enhanced gas sensing performance, giving a low limit of detection (500 ppb). It shows high responses of 28.5 and 18.2–100 ppm ethanol and acetone at the operating temperature of 320 °C, which were about 2.3 and 1.7 times higher than those of the pure WO₃, respectively. The enhanced sensing properties of MoO₃/WO₃ gas sensor can be attributed to the addition of MoO₃, which has been discussed in relation to the gas sensing mechanism.