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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Spectroscopy of GaSe Nanoparticle Aggregates
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Spectroscopy of GaSe Nanoparticle Aggregates

机译：GaSe纳米颗粒聚集体的光谱学

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摘要

The concentration-dependent spectroscopic characteristics of GaSe nanoparticles are interpreted in terms of the particles forming strongly interacting aggregates in high-concentration, room-temperature solutions. The high-concentration absorption spectra are semiquantitatively modeled in terms of the lowest two absorption bands of bulk GaSe, quantum confinement effects, and dipolar coupling between excited state monomers. The model predicts that the lowest energy absorption band shifts slightly to the red and sharpens, while the next band shifts to the blue as the concentration is increased. This correctly explains the observed absorption spectra and their reversible changes with concentrations. Static emission data and initial anisotropies of time-resolved emission may also be qualitatively understood on the basis of this simple model. From the model, the interparticle coupling is estimated to be about -300 cm~(-1). This is less than the energy differences between adjacent particles in the aggregates but much greater than what is observed between other types of semiconductor nanoparticles. Polydisperse samples have larger energy differences but comparable couplings between adjacent particles. As a result, the spectroscopic effects of aggregation are less pronounced. The nanoparticle aggregate spectra are reminiscent of J-aggregate spectra of organic dyes.
机译：GaSe纳米粒子的浓度依赖性光谱特征可以解释为在高浓度的室温溶液中形成强相互作用的聚集体的粒子。根据本体GaSe的最低两个吸收带，量子约束效应和激发态单体之间的偶极耦合，对高浓度吸收光谱进行半定量建模。该模型预测，随着浓度的增加，最低的能量吸收带将轻微移至红色并变尖，而下一个能量吸收带将移至蓝色。这正确地解释了观察到的吸收光谱及其随浓度的可逆变化。在此简单模型的基础上，也可以定性地了解静态发射数据和时间分辨发射的初始各向异性。根据该模型，粒子间耦合估计为-300 cm〜（-1）。这小于聚集体中相邻颗粒之间的能量差，但远大于其他类型的半导体纳米颗粒之间观察到的能量差。多分散样品具有较大的能量差，但是相邻颗粒之间的偶联相当。结果，聚集的光谱效应不太明显。纳米粒子的聚集光谱让人想起有机染料的J聚集光谱。

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