A fast responsive triethylamine gas sensor based on heterostructured YVO4/V2O5 composites

The pure YVO 4 and heterostructured YVO 4 /V 2 O 5 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 YVO 4 /V 2 O 5 composites. The results show that the YVO 4 /V 2 O 5 composites has smaller particle size (reduced from 200 nm to 50 nm) and larger specific surface area, which is increased from 7.738 m 2 /g to 26.586 m 2 /g). Compared with pure YVO 4 , the n-type sensor based on YVO 4 /V 2 O 5 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 YVO 4 /V 2 O 5 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 YVO 4 /V 2 O 5 composites. This work provides a valuable direction for low-cost preparation of TEA sensors with excellent performance and long-term stability.