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*   

  1. Shenyang University of Chemical Technology,Shenyang 110142,China
  • Received:2020-03-04 Online:2020-10-01 Published:2020-09-30
  • Contact: MENG Dan, associate professor; Tel:024-89386342;; 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: 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