超小SnO_(2)纳米颗粒的制备及其气敏特性

Preparation and Gas Sensing Properties of Ultra-fine SnO_(2)Nanoparticles

以葡萄糖和SnCl_(4)·5H_(2)O溶液为原料,采用水热法制备超小SnO_(2)纳米颗粒.在合成过程中,向溶液中加入不同量的磷酸(PA).利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和比表面积测试仪对SnO_(2)进行表征,研究添加磷酸对气敏性能的影响,并分析其气敏机理.结果表明:最终产物具有超小的颗粒尺寸和较大的比表面积,其中掺杂0.6 mmol磷酸的SnO_(2)所制备的气体传感器气敏性能最好,在最佳工作温度200℃下,灵敏度达7.5,且具有良好的稳定性;其气敏特性的提高归因于超小的颗粒尺寸和较大的比表面积,有利于乙醇气体吸附.

Ultra-fine SnO_(2)nanoparticles were prepared by hydrothermal method using glucose and SnCl_(4)·5H_(2)O solution as raw materials.During the synthesis process,different amounts of phosphoric acid(PA)were added into the solution.X-ray diffraction(XRD),scanning electron microscope(SEM),and specific surface area tester were used to characterize the SnO_(2)products.We studied the effect of adding PA on the gas sensing properties and analyzed its gas sensing mechanism.The results show that the final products have the ultra-fine particle size and large specific surface area,among which the gas sensor prepared by SnO_(2)doped with 0.6 mmol PA has the best gas sensing performance,at the optimal operating temperature of 200℃,the sensitivity reaches 7.5 and has good stability.The improvement of its gas sensing properties is attributed to the ultra-fine particle size and large specific surface area,which is beneficial to the adsorption of ethanol gas.