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Implications of sample aging on the formation of internally etched silica coated gold nanoparticles

机译:样品老化对内部蚀刻的二氧化硅涂层金纳米颗粒形成的影响

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摘要

Aging time and storage conditions of silica stabilized gold nanoparticles impact the mechanism of nanoparticle-rattle structure formation. These differences are evaluated using electron microscopy and localized surface plasmon resonance spectroscopy coupled with modelling of gold nanosphere sensitivity to their local dielectric environment. Sample aging is revealed to impact the overall silica density and subsequent void formation in these structures. In all samples, voids formed near the metal cores and increased in size, which could be quantified using modelling. All in all, these results suggest that optimal silica membrane formation likely depends on initial silica density, which is directly related to sample age and storage conditions. As a result, these considerations as well as dielectric modelling could be exploited for future synthesis and use of these materials in surface enhanced spectroscopy and catalytic applications.
机译:二氧化硅稳定的金纳米粒子的老化时间和储存条件影响着纳米粒子-ttle子结构形成的机理。使用电子显微镜和局部表面等离子体激元共振光谱,结合金纳米球对其局部电介质环境的敏感性建模,可以评估这些差异。样品老化表明会影响总体二氧化硅密度以及这些结构中随后形成的空隙。在所有样品中,空隙都在金属芯附近形成并且尺寸增大,可以使用模型进行量化。总而言之,这些结果表明最佳的二氧化硅膜形成可能取决于初始的二氧化硅密度,而二氧化硅的初始密度与样品的老化时间和储存条件直接相关。结果,可以将这些考虑因素以及介电模型用于将来的合成以及在表面增强光谱学和催化应用中使用这些材料。

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