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Enhanced reactivity and related optical changes of Ag nanoparticles on amorphous Al_2O_3 supports

机译:Ag纳米粒子在无定形Al_2O_3载体上的增强的反应性和相关的光学变化

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Pairs of samples containing Ag nanoparticles (NPs) of different dimensions have been produced under the same conditions but on different substrates, namely standard glass slides and a thin layer of amorphous aluminum oxide (a-Al_ 2O_3) on-glass. Upon storage in ambient conditions (air and room temperature) the color of samples changed and a blue-shift and damping of the surface plasmon resonance was observed. The changes are weaker for the samples on-glass and tend to saturate after 12 months. In contrast, the changes for the samples on a-Al_2O_3 appear to be still progressing after 25 months. While x-ray photoelectron spectroscopy shows a slight sulfurization and negligible oxidation of the Ag for the on-glass samples upon 25 months aging, it shows that Ag is strongly oxidized for the on a-Al_ 2O_3 samples and sulfurization is negligible. Both optical and chemical results are consistent with the production of a shell at the expense of a reduction of the metal core dimensions, the latter being responsible for the blue-shift and related to the small (<10 nm initial diameter) of the NPs. The enhanced reactivity of the Ag NPs on the a-Al_ 2O_3 supports goes along with specific morphological changes of the Ag NPs and the observation of nitrogen.
机译:在相同条件下但在不同基板(即标准载玻片和玻璃上的无定形氧化铝薄层(a-Al_2O_3))上生产了含有不同尺寸的Ag纳米粒子(NPs)的成对样品。在环境条件(空气和室温)下保存后,样品的颜色发生了变化,并观察到蓝移和表面等离子体共振的衰减。玻璃上样品的变化较弱,并且在12个月后趋于饱和。相反,在25个月后,a-Al_2O_3上样品的变化似乎仍在进行。 X射线光电子能谱显示,经过25个月的老化,玻璃上样品的银有轻微的硫化,而氧化可忽略不计,但表明a-Al_2O_3样品上的Ag被强烈氧化,而硫化可以忽略不计。光学和化学结果均与壳的生产一致,但以减小金属核的尺寸为代价,金属核的尺寸引起蓝移并与NP的小(初始直径小于10 nm)有关。 Ag NP在a-Al_2O_3载体上的增强的反应性与Ag NP的特定形态变化和氮的观察相伴。

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