Ultrafast Nanostructuring Oxidation of Crystallized Intermetallic ZrAu at 25 °C
Ultrafast Nanostructuring Oxidation of Crystallized Intermetallic ZrAu at 25 °C
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25 °C 结晶金属间化合物 ZrAu 的超快纳米结构氧化
DOI：
10.1021/cm011184z
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Lomello
中科院分区：
文献类型：
--
作者：
J. Valmalette;M. Isa;A. Passard;M. Lomello
在这项研究中，我们首先报告了在25 °C下在几个小时内通过空气氧化结晶ZrAu获得的金和氧化锆簇（尺寸从3.5到7 nm不等）的阐述。使用X射线衍射，红外光谱（透射和DRIFTS），和电子显微镜（SEM和HREM）技术观察到这种转变。这种固态纳米结构被解释为组合机制的结果：氧的吸附和扩散，金原子从Zr Au合金到Au簇上的偏析，以及由内部残余应力和通过金簇链的电子电流的渗透的过程的加速。气体物种吸附非常小的金簇支持的氧化锆形成在该氧化的初始步骤可以诱导“催化辅助纳米结构氧化”。在该过程结束时获得大量的金和氧化锆纳米颗粒。
In this study we first report the elaboration of gold and zirconia clusters (ranging from 3.5 to 7 nm in size) obtained by air oxidation of crystallized ZrAu at 25 °C within a few hours. This transformation was observed using X-ray diffraction, infrared spectroscopy (transmission and DRIFTS), and electron microscopy (SEM and HREM) techniques. This solid-state nanostructuration is interpreted as a consequence of combined mechanisms: adsorption and diffusion of oxygen, segregation of gold atoms from ZrAu alloy onto Au clusters, and acceleration of the process by internal residual stress and percolation of the electronic current via gold-cluster chains. The gaseous species adsorption by very small gold clusters supported by zirconia formed at the initial step of this oxidation could induce “catalytically assisted nanostructuring oxidation”. Large amounts of gold and zirconia nanoparticles are obtained at the end of this process.