Spectral Screening of the Energy of Hot Holes over a Particle Plasmon Resonance,Nano Letters

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Spectral Screening of the Energy of Hot Holes over a Particle Plasmon Resonance
Nano Letters ( IF 9.6 ) Pub Date : 2019-02-21 00:00:00 , DOI: 10.1021/acs.nanolett.8b04950
Evangelina Pensa ₁ , Julian Gargiulo ₁ , Alberto Lauri ₁ , Sebastian Schlücker ₂ , Emiliano Cortés _{1,

3} , Stefan A. Maier _{1,

3}

Affiliation

Plasmonic hot carriers have been recently identified as key elements for photocatalysis at visible wavelengths. The possibility to transfer energy between metal plasmonic nanoparticles and nearby molecules depends not only on carrier generation and collection efficiencies but also on their energy at the metal–molecule interface. Here an energy screening study was performed by monitoring the aniline electro-polymerization reaction via an illuminated 80 nm gold nanoparticle. Our results show that plasmon excitation reduces the energy required to start the polymerization reaction as much as 0.24 eV. Three possible photocatalytic mechanisms were explored: the enhanced near field of the illuminated particle, the temperature increase at the metal–liquid interface, and the excited electron–hole pairs. This last phenomenon is found to be the one contributing most prominently to the observed energy reduction.

中文翻译：

质子等离子体共振上热孔能量的光谱筛选

等离子体热载流子最近已被确定为可见光波长下光催化的关键元素。在金属等离激元纳米粒子和附近的分子之间转移能量的可能性不仅取决于载流子的产生和收集效率，还取决于它们在金属-分子界面处的能量。在此，通过照射的80 nm金纳米颗粒监测苯胺的电聚合反应，进行了能量筛选研究。我们的结果表明，等离激元激发将启动聚合反应所需的能量降低了0.24 eV。探索了三种可能的光催化机理：被照粒子的近场增强，金属-液体界面处的温度升高以及激发的电子-空穴对。

更新日期：2019-02-21

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