CuO纳米线对挥发性有机化合物的气敏性能

Sensing properties of CuO nanowires for volatile organic compounds detection

通过简单经济的水溶液法并配合后续煅烧制备出了一维CuO纳米线。利用SEM、XRD、XPS等手段对所得纳米线的形貌、组成和晶体结构进行了表征，同时还测试了其在200℃下对常见挥发性有机物（VOC）的气敏响应状况。结果显示，CuO纳米线气敏传感器对（10～1000）×10–6（体积分数，以下同）的乙醇、甲醇、丙酮体现出优良的气敏响应特性，在（10～100）×10–6范围内，灵敏度随气体浓度增加呈线性增长，超过100×10–6后增长趋于平缓；响应时间均在10 s以内；浓度累加实验和多次重复实验显示出材料良好的稳定性和重复性；对所测11种VOC中的乙醇、甲醇、丙酮有一定的选择性；响应恢复基线无明显漂移；

The CuO nanowires were synthesized by using a facile and low-cost solution method combined with subsequent calcination. The morphology, composite and crystal structure of the products were examined by SEM, XRD and XPS. The volatile organic compounds sensing properties of the CuO nanowires gas sensor were also investigated at 200℃. The results demonstrate that the CuO nanowires gas sensor exhibits excellent sensing performances to （10–1 000）×10–6 volume fraction of ethanol, methanol and acetone. The sensor shows linear response at low concentration range of （10–100）×10–6 and saturates at high concentration range of （100–1 000）×10–6. All the response time is less than 10 s. The additive and repetitive experiments demonstrate good stability and reproducibility of the CuO nanowires sensor. The sensor shows some selectivity to ethanol, methanol and acetone when exposed to eleven detecting VOCs. There is no obvious drift of the baseline indicating the high recovery ability of the CuO nanowires sensor. At 300℃, the CuO nanowires sensor exhibits higher sensing response than that of commercial SnO2sensor to volume fraction of （10–1 000）×10–6 ethanol.