Novel in-situ deposited V2O5 nanorods array film sensor with enhanced gas sensing performance to n-butylamine

The regular and ordered arrangement of nanoarrays structure can provide effective transmission channels for the adsorption and desorption of gas molecules, and its excellent stability makes it have great advantages as a gas sensing material, which also poses challenges for the preparation of materials. In this work, V2O5 nanorods array was grown in-situ on ceramic tubes without seed layers by means of one-step solvothermal method. The structural characterization showed that the V2O5 nanorods array structure completely covered the surface of the ceramic tube. The gas sensing test results showed that the V2O5 nanorods array sensor had high response (100 ppm, Ra/Rg = 10.8), low detection limit (100 ppb), good reproducibility and long-term stability to n-butylamine. Its excellent sensing performance can be conributed to the fact that the array structure of nanorods can provide more active surfaces, and a great deal of gaps are formed between stacked nanorods, which is helpful to rapid response and recovery of gases. Moreover, from the perspective of the array structure of V2O5 nanorods and the chemical oxidation–reduction process, the possible detection mechanism of n-butylamine by the sensor was also discussed. The excellent gas sensing performance has the latent application prospect in the detection of trace amine gases.