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Nickel nanoparticle assembly on single-crystal support: formation, composition and stability

机译：单晶载体上的镍纳米颗粒组装体：形成，组成和稳定性

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A nickel nanoparticle assembly was formed by vapour deposition on various single-crystal supports. The nanoparticle structure, distribution, composition and charge transfer properties were examined simultaneously by atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS), mass spectroscopy (MS) and electrochemistry. The data obtained by applied analytical techniques were correlated. X-ray photoelectron spectroscopy (XPS) of nanoparticle assemblies deposited at ambient temperature revealed the Ni(II) oxidation state, while metallic Ni was found in nanoparticles grown at 300 °C. The amount of nickel deposited on highly ordered pyrolytic graphite (HOPG) estimated by AFM was found to be an order of magnitude higher than that obtained from XPS analysis, while AFM and XPS data for silicon agree well. The discrepancy was discussed in terms of differences in support elastic properties and AFM-tip/surface interactions. Current-potential measurements of nanoparticle charge transfer reaction point to the high stability and low resistant Ohmic character of the nanoparticle/HOPG interface.
机译：通过在各种单晶载体上气相沉积形成镍纳米粒子组件。同时通过原子力显微镜（AFM），X射线光电子能谱（XPS），质谱（MS）和电化学检查了纳米颗粒的结构，分布，组成和电荷转移性质。通过应用分析技术获得的数据是相关的。在室温下沉积的纳米粒子组件的X射线光电子能谱（XPS）显示了Ni（II）的氧化态，而在300°C的纳米粒子中发现了金属Ni。通过AFM估计，沉积在高度有序的热解石墨（HOPG）上的镍量比XPS分析获得的镍量高一个数量级，而硅的AFM和XPS数据吻合得很好。根据支撑弹性性能和AFM尖端/表面相互作用的差异讨论了差异。纳米粒子电荷转移反应的电流电位测量指向纳米粒子/ HOPG界面的高稳定性和低电阻欧姆特性。

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