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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Picosecond Dynamics of Silver Nanoclusters. Photoejection of Electrons and Fragmentation
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Picosecond Dynamics of Silver Nanoclusters. Photoejection of Electrons and Fragmentation

机译：银纳米团簇的皮秒动力学。电子的光喷射和碎裂

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摘要

Silver colloids of panicle diameter 40-60 nm have been synthesized using a chemical reduction method in aqueous medium. These nanoclusters are photoactive and exhibit transient bleaching in the 400-500 nm region followed by a strong absorption in the visible-near-infrared region when subjected to 355 nm laser-pulse excitation. The transient bleaching of the surface plasmon absorption band is a monophotonic process, while the absorption growth in the red region is a biphotonic process arising from the photoejection of electrons. The 40-60 nm clusters were observed to break up into smaller clusters (5-20 nm) with 355 nm laser-pulse excitation. The choice of excitation wavelength provides the size selectivity in the fragmentation of the clusters. For example, when the excitation wavelength was switched to 532 nm, only larger (or irregularly shaped) particles were found to break up.
机译：使用化学还原法在水性介质中合成了圆锥直径为40-60 nm的银胶体。这些纳米团簇具有光活性，当受到355 nm激光脉冲激发时，它们会在400-500 nm范围内出现短暂的漂白，然后在可见光-近红外区具有很强的吸收能力。表面等离激元吸收带的瞬时漂白是单光子过程，而红色区域中的吸收增长是由电子的光喷射引起的双光子过程。观察到40-60 nm的团簇在355 nm激光脉冲激发下分解成较小的团簇（5-20​​ nm）。激发波长的选择在簇的碎裂中提供了尺寸选择性。例如，当激发波长切换到532 nm时，仅发现较大（或不规则形状）的颗粒破裂。

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