掺Sm~(3+)的WO_3纳米粉体的制备及其NO_2气敏性能

通过固相研磨法制得了一系列掺有Sm3+的WO3纳米粉体,利用XRD、TEM等测试手段,对其物相﹑结构进行了表征。结果表明:掺Sm3+的WO3纳米粉体结晶良好,平均粒径为50nm。利用该纳米粉体制成气敏元件,并采用静态配气法测试了元件的气敏性能。研究发现:当掺杂x(Sm3+)=0.5%时,元件在160℃下对体积分数为30×10-6的NO2气体的灵敏度高达169,响应时间为8s,是一种较为理想的低温NO2气敏元件。

Preparation and NO2 gas sensing property of Sm3+-doped WO3 nano powder

Sm3+ doped WO3 nano powder was prepared using the solid state grinding method.The phase composition and microstructure of the prepared nano powder were characterized with XRD and TEM,and the gas sensing property of gas sensors fabricated with the prepared nano powder was evaluated via the static volumetric method.The results show that Sm3+ doped WO3 nano powder show a high degree of crystallization and an average size of 50 nm.When the content of Sm3+ in nano powder is 0.5%(mole fraction),the sensitivity of gas sensor to NO2(volume ratio of 30×10-6) reaches 169 at 160 ℃ with a response time of 8 s.This indicates that the gas sensor made with WO3 nano powder containing 0.5%(mole fraction) of Sm3+ is a kind of high performance NO2 gas sensor workable at low temperatures.