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Gas-phase production of gold-decorated silica nanoparticles

机译:气相法制备金修饰的二氧化硅纳米粒子

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Gold-decorated silica nanoparticles were synthesized in a two-step process in which silica nanoparticles were produced by chemical vapor synthesis using tetraethylorthosilicate (TEOS) and subsequently decorated using two different gas-phase evaporative techniques. Both evaporative processes resulted in gold decoration of the silica particles. This study compares the mechanisms of particle decoration for a production method in which the gas and particles remain cool to a method in which the entire aerosol is heated. Results of transmission electron microscopy and visible spectroscopy studies indicate that both methods produce particles with similar morphologies and nearly identical absorption spectra, with peak absorption at 500-550nm. A study of the thermal stability of the particles using heated-TEM indicates that the gold decoration on the particle surface remains stable at temperatures below 900 °C, above which the gold decoration begins to both evaporate and coalesce
机译:用两步法合成了金修饰的二氧化硅纳米颗粒,该过程中使用原硅酸四乙酯(TEOS)通过化学气相合成法制备了二氧化硅纳米颗粒,然后使用两种不同的气相蒸发技术进行了修饰。两种蒸发过程均导致二氧化硅颗粒的金装饰。这项研究比较了气体和颗粒保持冷态的生产方法与整个气溶胶被加热的方法的颗粒装饰机理。透射电子显微镜和可见光谱研究的结果表明,两种方法均产生具有相似形态和几乎相同吸收光谱的粒子,在500-550nm处具有峰值吸收。使用加热的TEM对颗粒的热稳定性进行的研究表明,颗粒表面上的金装饰物在低于900°C的温度下保持稳定,高于900°C时,金装饰物开始蒸发并聚结。

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