Article ID Journal Published Year Pages File Type
5009845 Sensors and Actuators B: Chemical 2017 28 Pages PDF
Abstract
SnO2 has become most popular sensor material because of its excellent optical and electrical properties, but the existence of fast electron-hole recombination in SnO2 material is a critical limitation on developing high-performance gas sensors based on the photoconductive change. Herein, we investigate on polyoxometalate (C4H10ON)23[HN(CH2CH2OH)3]10H2[FeIII(CN)6(α2-P2W17O61CoII)4]·27H2O (abbr. as HPT) doping on SnO2 nanorods for improving gas sensing of formaldehyde and methylbenzene at room temperature (25 °C). The relevant photoconductivity and gas sensing performances demonstrated that the SnO2/HPT composite film had a higher photoconductivity than the pristine SnO2 film. This was attributed to the occurrence of photoinduced electron transfer from SnO2 to HPT, so that the electron-hole recombination in SnO2 could effectively be retarded. Furthermore, the composite film of SnO2/HPT exhibited obvious improvements in photoelectrical gas sensing of formaldehyde and methylbenzene at room temperature. This study represents a new insight into improving the sensing performance of SnO2-based gas sensors by incorporating polyoxometalate.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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