Synthesis of NiO-WO3 Nanocubes and Their Application in Detecting Formaldehyde

doi:10.11944/j.issn.1000-0518.2020.10.200059

Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (10): 1203-1210.DOI: 10.11944/j.issn.1000-0518.2020.10.200059

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Synthesis of NiO-WO₃ Nanocubes and Their Application in Detecting Formaldehyde

SAN Xiaoguang, GONG Xiaohui, LU Yiming, QIAO Tongtong, YOU Yu, MENG Dan^*

Shenyang University of Chemical Technology,Shenyang 110142,China

Received:2020-03-04 Published:2020-10-01 Online:2020-09-30
Contact: MENG Dan, associate professor; Tel:024-89386342; E-mail:mengdan0610@hotmail.com; Research interests:synthesis and application of functional materials
Supported by:
Supported by the National Natural Science Foundation of China(No.61973223), and Liaoning Provincial Natural Science Foundation(No.2019-ZD-0072)

Abstract

Abstract: The NiO-WO₃ nanocubes are synthesized by hydrothermal synthesis. The p-n junction is formed by introducing p-type NiO to WO₃ nanocubes. The products are characterized by XRD and SEM and have cube-like structures which are successfully retained after introducing NiO. The formaldehyde gas sensing properties are systematically investigated between the pure and NiO-WO₃ nanocubes. The NiO-WO₃ nanocube sensor exhibits enhanced response and lower operating temperature compared to the pure one. Especially, the 5% molar fraction of NiO-WO₃ nanocube sensor exhibits the excellent sensing properties. Its highest response to 0.134 mg/L formaldehyde gas is 18.5 at 200 ℃. In addition, fast response and recovery, good reproducibility and stability, and good selectivity to formaldehyde are also obtained, indicating the formation of NiO-WO₃ heterojunction in favor of improving the sensing properties. Meanwhile, the sensing enhancement mechanism of the NiO-WO₃ nanocubes is also discussed, which is related to the formation of hetrojunction at interface and the high catalytic activity of NiO.

Key words: NiO-WO₃, nanocubes, formaldehyde detection

SAN Xiaoguang, GONG Xiaohui, LU Yiming, QIAO Tongtong, YOU Yu, MENG Dan. Synthesis of NiO-WO₃ Nanocubes and Their Application in Detecting Formaldehyde[J]. Chinese Journal of Applied Chemistry, 2020, 37(10): 1203-1210.

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Synthesis of NiO-WO₃ Nanocubes and Their Application in Detecting Formaldehyde

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