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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Hot Carrier Generation in Two-Dimensional Silver Nanoparticle Arrays at Different Excitation Wavelengths under On-Resonant Conditions
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Hot Carrier Generation in Two-Dimensional Silver Nanoparticle Arrays at Different Excitation Wavelengths under On-Resonant Conditions

机译：在共振条件下的不同激发波长的二维银纳米粒子阵列中的热载体产生

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摘要

We evaluated the hot carrier generation in two-dimensional (2D) silver nanoparticle (AgNP) arrays under light illumination at different wavelengths, 458, 532, 671, and 785 nm. The 2D AgNP arrays were tailored to match the plasmon resonance to each excitation wavelength in order to fulfill the on-resonant condition. We selected para-aminothiophenol (p-ATP) as a probe molecule, which is chemically transformed into 4,4'-dimercaptoazobenzene (DMAB) upon light illumination. The reaction is driven by hot carriers emitted from a plasmonic surface. For evaluation of hot carrier generation, we monitored the chemical transformation from p-ATP into DMAB with surface-enhanced Raman scattering. The normalized Raman intensity of DMAB was plotted against the total exposure, where the peak intensity increased as the total exposure increased because of the increase of the number of DMAB molecules. The saturation of the peak growth was observed, indicating that the chemical transformation was completed, at different exposures for each wavelength. The total exposure required for completing the chemical transformation was smaller at 458 nm by at least similar to 10(5) times than that at 785 nm, although the difference of the photon energy was only 1.7 times. The growth of the Raman peak was related to the laser intensity as well, where the higher laser intensity showed a more rapid growth. These results indicated that more hot carriers with sufficient energy for the chemical transformation were generated at shorter excitation wavelengths as well as at higher laser intensities.
机译：我们在二维（2D）的银纳米颗粒（AgNP）根据光照明阵列以不同的波长，458，532，671，和785纳米进行评价热载流子的产生。所述2D AgNP阵列，定制，以匹配等离子体共振每个激发波长，以满足上谐振的条件。我们选择对 - 氨基苯硫酚（P-ATP）作为探针分子，其被化学转化成4,4'- dimercaptoazobenzene（DMAB）在光照明。该反应是通过从等离子体激元表面发射热载流子来驱动。对于热载流子产生的评价，我们监测从P-ATP的化学转化DMAB具有表面增强拉曼散射。 DMAB的归一化的拉曼强度作图的总曝光，其中，所述峰值强度增加作为总曝光增加，因为的DMAB分子数的增加。被观察到的峰的生长的饱和，这表明化学转化已完成，在每个波长不同的曝光。用于完成化学转化所需要的总曝光是在458nm处通过小至少类似于10（5）倍比在785nm处，虽然光子能量的差异只有1.7倍。拉曼峰的生长与激光强度为好，其中较高的激光强度呈现较快速的增长。这些结果表明用足够的能量更多的热载流子的化学转化物在较短的激发波长，以及在更高的激光强度产生。

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