Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 360, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.131634
Keywords
CO sensor; WSe2 hexagonal nanosheet; Density function theory; Sensing mechanism
Funding
- National Natural Science Foundation of China [51777215]
- Original Innovation Special Project of Science and Technology Plan of Qingdao West Coast New Area [2020-85]
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This paper investigates the gas sensing performance of a Pd-decorated WSe2 thin film sensor for CO gas. It is demonstrated that the Pd-WSe2 thin film sensor exhibits high sensitivity, excellent repeatability, good selectivity, and stability. The research also reveals the sensing mechanism of Pd-WSe2 film to CO gas based on first-principles density functional theory (DFT).
This paper demonstrates a high-performance CO sensor based on Pd-decorated WSe2 (Pd-WSe2) hexagonal nanosheet nanostructures. The X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy were used to examine the hydrothermally prepared Pd-WSe2 nanofilms. When exposed to different concentrations of CO gas at room temperature, the gas sensing performance of the Pd-WSe2 thin film sensor was studied. The Pd-WSe2 thin film sensor had excellent sensing performance for CO gas, including high sensitivity, excellent repeatability, good selectivity and stability. Based on first-principles density functional theory (DFT), the sensing mechanism of Pd-WSe2 film to CO gas was discovered, and it was proved from a theoretical perspective that the sensing performance of precious metal Pd doping on CO was better than those of other metal doping. This paper confirmed that the Pd-decorated WSe2 hexagonal nanosheets were a good candidate for high efficiency CO sensing.
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