PdO修饰的SnO2纳米球的制备及其气敏特性研究

通过溶剂热法和退火处理制备了不同浓度(0 mol％,2 mol％,5 mol％,10 mol％)PdO修饰的SnO2纳米球.采用X射线衍射仪(XRD)、X射线能谱分析仪(EDS)和扫描电子显微镜(SEM)等测试手段对材料的物相、元素种类和形貌进行了表征,并制成气敏元件,对氢气(H2)进行气敏测试.实验结果表明:5 mol％PdO修饰的SnO2纳米球气体传感器最佳工作温度为175℃,其对100×10-6氢气灵敏度达到19,是纯的SnO2纳米球的灵敏度的3倍.最后,对PdO修饰氧化锡纳米球气体传感器气敏机理进行了分析讨论.

Fabrication and gas-sensing properties of PdO decorated SnO2 nanospheres

Prisitine SnO2 and PdO decorated SnO2 nanospheres with different concentrations(0 mol％,2 mol％,5 mol％, 10 mol％)were synthesized via a solvothermal method and annealing treatment. The structure,element composition and micromorphology of the samples were investigated by X-ray diffraction(XRD),energy dispersive spectroscopy(EDS)and scanning electron microscope(SEM). Meanwhile,the gas sensing performances of SnO2@PdO nanospheres were investi-gated towards hydrogen detection. The results show that the response of 5 mol％PdO decorated SnO2 nanoshperes sensor can reach 19 to 100×10-6 hydrogen at the optimum working temperature(175℃),which is 3 times higher than the pure one. Finally,the gas-sensing mechanism of these gas sensors was discussed.