Au-CeO_2纳米杂聚体颗粒的合成研究

Synthesis of Au-CeO_2 Heterodimer Nanoparticles

在CeO2纳米立方体颗粒存在条件下,以丁基锂还原Au前体获得了Au-CeO2纳米杂聚体。采用TEM、HRTEM、STEM、EDS、XRD对纳米颗粒的形貌、结构及成分进行了分析。考察了实验条件对杂聚体形成的影响。结果表明,丁基锂适宜用作Au的还原剂,Au还原速度不能过快以保证Au在CeO2纳米颗粒表面能以多相成核方式形核长大。Au和Au-CeO2纳米颗粒浸渍γ-Al2O3后焙烧的实验表明,Au-CeO2杂聚体结构能有效抑制Au在高温下的凝聚长大。

In the presence of CeO2 nanoeubes, Au precursor was reduced by butyllithium to form Au-CeO2 heterodimer nanoparticles. TEM, HRTEM, STEM, EDS and XRD were used to analyse the morphology, structure and composition of the nanoparticles. The effects of experimental conditions on the formation of heterodimer were investigated. According to the results, butyllithium was suitable to be used as reducing agent of Au, and the reduction rate of Au should be controlled to ensure Au nucleate on the surface of CeO2 nanoparticles. The experiment results also approve that Au-CeO2 heterodimer structure can effectively reduce the possibility of Au nanoparticles＇ agglomeration on alumina.