孪连柱状ZnO的水热合成及其气敏性能研究

Hydrothermal synthesis and gas sensitivity of twin column-like ZnO

采用水热法合成了孪连柱状ZnO纳米粉体,通过X射线衍射仪(XRD)、扫描电镜(SEM)、红外光谱仪(IR)和X-射线光电子能谱仪(XPS)等对产物的物相、微观形貌、表面化学键及化学组分进行了表征与分析,并用静态配气法测试了其厚膜型元件的气敏性质,结果表明,产物属于纤锌矿型六方晶系的ZnO,平均直径约300 nm,长约500 nm,其厚膜型元件在工作温度为395℃时对体积分数为100×10-6乙醇和丙酮气体能快速响应,灵敏度分别达到了14.4和29.4,特别是对丙酮气体具有较好的选择性。

Twin column-like ZnO nanopowders were synthesized through a hydrothermal method with Zn（CH3COO）2·2H2O and KOH as the raw materials and cetyl trimethyl ammonium bromide（CTAB） as surfactant. The phase composition, microstructure, surface chemical bonds and chemical composition of the products were characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM）, infrared spectrometer（IR） and X-ray photoelectron spectroscopy（XPS）. The thick film-type gas sensor was fabricated and its gas sensing properties were evaluated with stationary state gas distribution method. The results indicated that the products belonged to hexagonal crystal cell and were uniform with the diameter of 300 nm and the length of 500 nm. The sensor based on the twin column-like ZnO exhibited rapid responses to ethanol and acetone（volume fraction of 100×10-6） at working temperature of 395℃, and the sensitivities reached 14.4 and 29.4. It was important to note that the sensor showed a good selectivity to acetone.