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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Broadband Optical Absorption Caused by the Plasmonic Response of Coalesced Au Nanoparticles Embedded in a TiO2 Matrix
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Broadband Optical Absorption Caused by the Plasmonic Response of Coalesced Au Nanoparticles Embedded in a TiO2 Matrix

机译：嵌入TiO2基体中的聚结金纳米颗粒的等离子体响应引起的宽带光吸收

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摘要

The effect of Au nanopattides' (NPs) concentration, site, and spatial distribution within a TiO2 dielectric matrix on the localized surface plasmon resonance (LSPR) band characteristics was experimentally and theoretically studied. The results of the analysis of the Au NPs' size distributions allowed us to conclude that isolated NPs grow only up to 5 to 6 nm in site, even for the highest annealing temperature used. However, for higher volume fractions of Au, the coalescence of closely located NPs yields elongated clusters that are much larger in size and cause a considerable broadening of the LSPR band. This effect was confirmed by Monte Carlo modeling results. Coupled dipole equations were solved to find the electromagnetic modes of a supercell, where isolated and coalesced NPs were distributed, from which an effective dielectric function of the nanocomposite material was calculated and used to evaluate the optical transmittance and reflectance spectra. The modeling results suggested that the observed LSPR band broadening is due to a wider spectral distribution of plasmonic modes, caused by the presence of coalesced NPs (in addition to the usual damping effect). This is particularly important for detection applications via surface-enhanced Raman spectroscopy (SERS), where it is desirable to have a spectrally broad LSPR band in order:to favor the fulfillment of the conditions of resonance matching, to electronic transitions in detected species.
机译：通过实验和理论研究了纳米TiO 2的浓度，位置和在TiO2介电基体内的空间分布对局域表面等离子体共振（LSPR）能带特性的影响。对金纳米颗粒尺寸分布的分析结果使我们得出结论，即使在所使用的最高退火温度下，分离出的纳米颗粒仅在现场生长到5至6 nm。但是，对于较高的Au含量，紧密结合的NP会产生细长的簇，簇的大小要大得多，并且会导致LSPR谱带相当宽的展宽。蒙特卡洛建模结果证实了这一效果。求解偶极子方程组，以找到一个超级电池的电磁模式，在该模式中，孤立的和凝聚的NP分布，从而计算出纳米复合材料的有效介电函数，并用于评估光透射率和反射光谱。建模结果表明，观察到的LSPR谱带展宽是由于等离子NP的存在（除了通常的阻尼效应）引起的等离子波模的频谱分布更宽。这对于通过表面增强拉曼光谱（SERS）进行的检测应用尤其重要，在该应用中，希望具有光谱宽的LSPR谱带，以便：满足共振条件的满足，以实现被检测物种的电子跃迁。

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