This work reports a simple, time efficient, template-free solvothermal and environmentally friendly method for the synthesis of V₂O₅ nanospheres (NSs) for xylene gas detection. The four types of V₂O₅-5, V₂O₅-7, V₂O₅-9 and V₂O₅-11 NSs have been synthesized and tested toward xylene in concentration ranging from 1 ppm to 300 ppm. The V₂O₅-7 sensor exhibits excellent sensing response of 2.75 toward 100 ppm xylene gas within fast response time of 21 s with obtained limit of detection (LOD) of 1 ppm at optimal operating temperature 290 °C. The sensing mechanism is based on an interaction of V₂O₅ NSs towards xylene through chemical reaction with adsorbed oxygen species present on V₂O₅ NSs, resulting in a thinner depletion layer and a lower potential barrier which further leads to decrease in sensor resistance. These experimental results suggest that the V₂O₅ NSs based sensors have potential to fulfill the demands in the gas sensing field.

这项工作报告了一种简单，省时，无模板的溶剂热和环保方法，用于合成用于二甲苯气体检测的V ₂ O ₅纳米球（NSs）。已经合成了四种类型的V ₂ O ₅ -5，V ₂ O ₅ -7，V ₂ O ₅ -9和V ₂ O ₅ -11 NS，并以浓度范围为1 ppm至300 ppm的二甲苯进行了测试。V ₂ O ₅-7传感器在21 s的快速响应时间内对100 ppm二甲苯气体表现出出色的2.75响应响应，在290°C的最佳工作温度下获得的检测限（LOD）为1 ppm。感应机制基于V ₂ O ₅ NSs通过与存在于​​V ₂ O ₅ NSs上的吸附氧物种发生化学反应而与二甲苯发生相互作用，从而导致更薄的耗尽层和更低的势垒，这进一步导致传感器电阻降低。这些实验结果表明，基于V ₂ O ₅ NSs的传感器具有满足气体传感领域需求的潜力。