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不同方法掺杂Au对纳米α-Fe2O3气敏性能的影响
The Effect of Au-doping by Different Methods on Gas-sensing Properties of α-Fe2O3 Nanopowders
【摘要】 分别采用共沉淀法、浸渍法、紫外辐照法制备了掺杂不同Au含量的α-Fe2O3纳米粉体,并制作了旁热式厚膜型气敏元件.用XRD、TG-DTA和TEM技术对纳米晶的晶型、晶粒大小及形貌进行了表征.考察了掺杂方法、Au含量及焙烧温度对α-Fe2O3气敏性能的影响.结果表明,采用三种方法掺杂适量Au后,都使α-Fe2O3的气敏性有了显著提高,其中采用共沉淀法,在400℃焙烧的Au质量分数为1.5%的α-Fe2O3的气敏性最佳.
【Abstract】 Au-doped a-Fe2O3 nanopowders were prepared by coprecipitation, impregnation, and ultraviolet irradiation methods, respectively. The Au/a-Fe2O3 nanopowders were characterized by TG-DTA, XRD, and TEM . The effects of dopping methods, the Au content, and the calcination temperature on gas-sensing properties of a-Fe2O3 were studied . The results showed that a-Fe2O3 sensors presented much higher sensitivity after doped with Au. Among them, the Au-doped a-Fe2O3(w(Au)=1.5%, calcinated at 400 ℃) prepared by coprecipitation gave the best sensitivity.
【Key words】 a-Fe2O3； Dope； Gas-sensing property； Coprecipitation method； Impregnation method； Ultraviolet irradiation method；
- 【文献出处】 物理化学学报 ,Acta Physico-Chimica Sinica , 编辑部邮箱 ,2006年01期
- 【分类号】O611.3
- 【被引频次】18
- 【下载频次】295