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Photothermal conversion of SiO2@Au nanoparticles mediated by surface morphology of gold cluster layer

机译：由金簇层表面形态介导的SiO 2介导的SiO2 @ Au纳米粒子的光热转化

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摘要

Photothermal effects in SiO _(2) @Au core–shell nanoparticles have demonstrated great potential in various applications for drug delivery, thermo-photovoltaics and photothermal cancer therapy, etc. However, the photothermal conversion of SiO _(2) @Au nanoparticles partially covered by disconnected gold clusters has rarely been investigated systematically. Here, we control the surface morphology of gold clusters on the photothermal conversion performance of SiO _(2) @Au core–shell nanoparticles by means of chemically adjusting the synthesis parameters, including amounts of gold salts, pH value and reducing agent. The macroscopic variations of the photothermal heating of different nanoparticle dispersions are significantly influenced by the nanoscale differences of gold cluster morphologies on the silica core. The temperature rise can be enhanced by the strong near-field coupling and collective heating among gold clusters with a relatively uniform distribution on the silica core. A numerical model of the simplified photothermal system is formulated to interpret the physical mechanism of the experimental observation, and shows a similar trend of temperature rise implying a reasonably good agreement with experimental data. Our work opens new possibilities for manipulating the light-to-heat conversion performance of SiO _(2) @Au core–shell nanoparticles and potential applications of heat delivery with spatial resolution on the nanoscale.
机译：SiO_（2）@AU核 - 壳纳米粒子的光热效应在各种应用中表现出巨大的药物递送，热光伏和光热癌疗法等潜力。然而，SiO_（2）@Au纳米粒子的光热转化部分部分地被断开的金集群覆盖很少已经系统地调查。这里，通过化学调节合成参数，控制SiO _（2）@Au核 - 壳纳米粒子的光热转化性能的金簇的表面形态，包括金盐，pH值和还原剂的量。不同纳米颗粒分散体的光热加热的宏观变化受到二氧化硅核心的金簇形态的纳米级差异的显着影响。通过在二氧化硅芯上具有相对均匀的分布的金簇之间的近乎近场耦合和集体加热，可以提高温度升高。配制了简化的光热系统的数值模型，以解释实验观察的物理机制，并显示出类似的温度趋势意味着与实验数据相当好的协议。我们的作品为操纵SiO_（2）@AU核 - 壳纳米粒子的光到热转换性能和热输送在纳米级上的空间分辨率的潜在应用的新可能性。

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