水热因素对ZnO纳米材料气敏性能的影响

Effects of Hydrothermal Factors on Gas Sensing Performances of ZnO Nanomaterials

通过水热法合成了不同形貌的氧化锌(ZnO)气敏传感材料,利用X射线衍射仪和热场发射扫描电子显微镜对其进行了结构表征和分析,研究了不同的水热因素对其形貌的影响。利用Agilent B2900A quick I/V测试软件测试了其对乙醇气体的敏感性。实验结果表明:前驱体浓度、反应时间和反应温度会对ZnO纳米棒的生长造成显著影响。在前驱体浓度为20 mmol/L、反应时间为8 h、反应温度为95℃的条件下进行水热反应能得到较高质量和良好长径比的纳米线。通过气敏性能测试发现该条件下制备的样品在使用叉指电极时响应度为79%,响应时间和恢复时间均为4 s,表明该条件下制备出的气敏传感材料具有良好的响应度、响应时间和恢复时间。

The zinc oxide(ZnO)gas sensing materials with different morphologies were synthesized by hydrothermal method,and their structures were characterized and analyzed by X-ray diffractometer and thermal field emission scanning electron microscope.The effects of different hydrothermal factors on morphologies of the ZnO gas sensing materials were studied.The sensitivity of the ZnO gas sensing materials to ethanol gas was tested using the Agilent B2900 A quick I/V test software.The experimental results show that the precursor concentration,reaction time and reaction temperature significantly affect the growth of the ZnO nanorods.Hydrothermal reaction was carried out under the condition of the precursor concentration of 20 mmol/L,reaction time of8 h and reaction temperature of 95℃,and then the nanowires with high quality and good aspect ratio were obtain.The gas-sensitivity performance test shows that for the prepared sample with the interdigital electrodes,the responsivity is 79%and the response time and recovery time are both4 s,indicating that the gas sensing materials prepared under the condition have good responsivity,response time and recovery time.