Pt掺杂SnO_2花状纳米结构的合成及其气敏性能的研究

Synthesis and gas sensing properties of flowers-like Pt-doped SnO_2 nanomaterials

用原位掺杂法制备了Pt/SnO2花状纳米结构。通过控制反应源物中n(Pt4+)/n(Sn4+)比率,可以获得不同Pt掺杂量的复合纳米结构。采用SEM、XRD、TEM和Raman光谱对样品的形貌、结构等进行了分析,并测试了材料的NH3气体敏感性能。结果表明,Pt掺杂的SnO2纳米花大小约为2μm,由平均直径为180nm,长度约为500nm的纳米棒组成;掺杂后SnO2的拉曼振动峰有了较大的偏移,并出现了新峰148cm-1,这可能与Pt掺杂造成的晶格畸变有关;由Pt/SnO2纳米材料制得的气敏元件在300℃时对2.00×10-4的NH3的灵敏度可达80。

Flowers-like Pt/SnO2 nanostructures with controllable composition were prepared by a one-pot wet chemical method.The morphology,size and phase structure were characterized by scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,X-ray diffraction（XRD） and Raman spectroscopy.The results show that SnO2 nano-flowers with an average diameter of 2μm consist of nanorods with a diameter of 180nm and length of 500nm.Obvious peak shift and a new Raman peak were observed because of the significant lattice distortion induced by the doping of Pt.The sensitivity of the sensor for 2.00×10-4 NH3 could reach 80 under 300℃.