Abstract
The pure YVO4 and heterostructured YVO4/V2O5 gas sensitive materials were prepared by simple and economic hydrothermal path. A variety of characterization methods were used to study the morphology, specific surface area and binding state of YVO4/V2O5 composites. The results show that the YVO4/V2O5 composites has smaller particle size (reduced from 200 nm to 50 nm) and larger specific surface area, which is increased from 7.738 m2/g to 26.586 m2/g). Compared with pure YVO4, the n-type sensor based on YVO4/V2O5 composites has higher response value (increased from 12.29 to 42.15), lower optimal operating temperature (reduced from 200 °C to 140 °C), and shorter response/recovery time (reduced from 11 s/25 s–6 s/14 s). The YVO4/V2O5 composites gas sensor has excellent selectivity and good long-term stability for triethylamine gas. The study of gas sensing mechanism shows that n-n heterojunctions and large specific surface area conduce excellent gas-sensitive property of YVO4/V2O5 composites. This work provides a valuable direction for low-cost preparation of TEA sensors with excellent performance and long-term stability.
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