三维结构ZnO基乙醇气敏材料的制备及改性

以尿素为沉淀剂，基于溶剂热法制备出具有特殊三维结构的纳米ZnO，并通过改变Ag的掺杂量制备乙醇气敏材料.利用XRD和SEM对所得产物的晶体结构及微观形貌进行表征， 采用静态配气法对制得的气敏元件进行性能检测.实验结果表明:与纯3D-ZnO相比，掺杂Ag可以有效地改善三维ZnO材料对乙醇气体的气敏性能.且当Ag掺杂质量分数为1.5 % 时，气敏元件对体积分数0.1%乙醇气体的响应值达31.61，工作温度由350℃降至200℃，同时响应/恢复时间缩短至10s/10s且乙醇选择性提高.

Preparation and Modification of Three-Dimensional ZnO-Based Ethanol Gas Sensitive Materials

Nanosized ZnO with a special three-dimensional (3D) structure was prepared by a solvothermal method using carbamide as the precipitant and then an ZnO-based ethanol gas sensitive material was obtained successfully by changing the doping amount of Ag. The phase structure and microstructure of the obtained products were characterized by XRD and SEM and the gas sensing property was tested using the static volumetric method. The results show that the gas sensing performance of 3D ZnO-based ethanol can improve effectively by doping Ag， in comparison with pure 3D-ZnO. When the amount of doping Ag is 1.5% and the volume fraction of ethanol is 0.1%， the value of gas sensor is up to 31.61， the operating temperature decreases from 350℃ to 200℃ and the response/recovery time are shorted to 10s/10s. Meanwhile， the selectivity to ethanol gas is enhanced.