溶剂热法制ZnO纳米棒及其气敏性能

Gas sensing performance of ZnO nanorods synthesized by solvothermal method

以乙酰丙酮锌为原料,采用溶剂热法首次合成了棒状ZnO纳米粉体,并对该材料在不同工作温度下的气敏性能进行了研究。通过XRD、SEM和TEM等测试手段,表征其物相与结构。该粉体为六方晶系的ZnO纳米棒,直径约为30 nm,长度约为100 nm,结晶良好。通过静态配气法发现:采用N型氧化锌纳米棒所制得的元件在270℃下,对体积分数为5×10-4的乙醇有较好的气敏性能,灵敏度为75,响应时间及恢复时间分别为30、60 s,说明制备的ZnO纳米棒是具有潜力的探测乙醇气体的气敏传感器材料。

This paper describes the first synthesis of ZnO nanorods using a simple solvothermal method, with zinc acetylacetonate（Zn（ C5H7O2） 2·H20） as the raw materials, the investigation into the gas sensing performances of materials subjected to different temperatures, and the characterization of the phases and structure using X-ray diffraction （ XRD ）, scanning electron microscopy （ SEM ）, and transmission electron microscope （TEM）. The products, behaving as ZnO nanorods of hexagonal system with the diameter of about 30 nm, and the length of about 100 nm, feature a better crystallization. Sta- tionary state gas distribution method leads to the finding that at the working temperature of 270℃, the elements synthesized with N-type ZnO nanorods exhibit a better gas sensing response to 5 × 10^（-4） volume fraction of ethanol, with a sensitivity of 75, a response time of 30 s, and a recovery time of 60 s. It follows that the prepared ZnO nanorods act as gas sensor materials with a potentially greater ability to detect ethanol gas.