In situ synthesis of polyoxometalate-derived MoS2/phosphomolybdic acid composites for highly sensitive NO2 detection
JOURNAL OF ALLOYS AND COMPOUNDS(2024)
摘要
MoS(2 )is a promising gas sensing material due to its low resistance and low operating temperature. But the sensitivity of MoS2 is limited by fast electron-hole complexation. In this work, phosphomolybdic acid (PMo12) was used as precursor. After sulfurizing by one-step hydrothermal method, the generated MoS(2 )and unspent PMo(12 )can in-situ form MoS2/PMo(12 )composite nanospheres. The gas sensing performances of the composite were comprehensively investigated. By adjusting hydrothermal reaction temperature, optimized sensitivity (MoS2/PMo12-240) to NO2 gas can be gained. At a low operating temperature of 80 degrees C, the optimized response value to 100 ppm NO2 gas is 2.466, which is higher than most reported MoS2-based NO2 sensors. Moreover, MoS2/PMo12-240 composite also exhibits good selectivity, repeatability, long-term stability and humidity resistance. The mechanism of sensing performance enhancement was also analyzed and discussed. As a semiconductor-like material, PMo12 can form heterojunction together with MoS2. The valence band of PMo12 can capture the holes in MoS(2)and effectively suppresses electron-hole complexation. Thus the sensing performance can be improved. This work provides a new strategy for designing and constructing high performance sulfide composite gas sensors by introducing POMs.
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关键词
Polyoxometalate,Composite material,Gas sensor,Nitrogen dioxide,Molybdenum disulfide
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