Au@SnO_2核/壳纳米粒子制备及其氧气气敏性能的研究  

The Synthetic and Detection of Oxygen Sensitivity of Au@SnO_2 Core/Shell Nanoparticles

作　　者：崔杰[1,2] 佟晓林[2] 刘向东[2] 

机构地区：[1]华中科技大学材料学与工程学院,武汉430074 [2]华中科技大学物理学院,武汉430074

出　　处：《材料导报》2011年第18期41-43,共3页Materials Reports

基　　金：国家自然科学基金(10774052)

摘　　要：在预先制备的Au纳米粒子溶液中还原SnCl2合成AuSn纳米粒子,然后采用阶段性升温氧化获得Au@SnO2核/壳纳米粒子。采用XRD和TEM对合成的纳米粒子进行表征。在200℃和300℃分别测量Au@SnO2纳米粒子薄膜电阻随氧压变化的特性,结果表明,300℃条件下,当氧压为1.013×105Pa时Au@SnO2薄膜电阻是初始状态的13.75倍;200℃条件下,当氧压为1.013×105Pa时Au@SnO2薄膜电阻是初始状态的3.67倍。Au@SnO2 core/shell nano-particles were synthesized by three-step oxidation of AuSn intermetallic nano-particles. The latter were prepared by reduction of SnCl2 in the presence of pre-prepared Au nano-particle seeds at room temperature. The Au@SnO2 nano-particles were characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）. The oxygen pressure dependence of the resistivity of Au@SnO2 nano-particle film was measured. The results indicate that the Au@ SnO2 nano-particle films show promise sensitivity as chemical sensor. The underlying mechanics were also discussed from the viewpoint of energy-band structure at Au/SnO2 interface.

关 键 词：Au种 Au@SnO2核/壳纳米粒子 气敏传感器 

分 类 号：TB383[一般工业技术—材料科学与工程]