通过纳米多孔金的电化学粗化开展的尺寸依赖光发射研究
Size dependent photoemission study by electrochemical coarsening of nanoporous gold
AI总结：
该研究通过电化学电位循环逐步粗化纳米多孔金，揭示光电子发射量子效率随韧带直径增大而按直径平方反比下降，并量化了小尺寸下的电子发射效率。
摘要：
等离激元材料中热载流子的产生与利用已成为一个具有重要意义的课题，对光电子学、光伏、光催化和传感等多个学科具有深远影响。在本研究中，我们利用纳米多孔金（npAu）的纳米尺度特征尺寸及其互连性质，研究了从npAu出发的热电子转移与结构尺寸之间的依赖关系。我们采用紫外光照下从纳米多孔金向电解质中的光电子注入作为一种测试性电子转移过程。初始韧带直径小于10 nm的纳米多孔金薄膜在光电化学装置中通过电位循环被逐步粗化，从而使我们能够精确探测韧带直径对光电流响应的影响。所得韧带直径的变化通过扫描电子显微镜（SEM）分析得到确认。当韧带直径由8 nm增加至16 nm时，量子效率相应下降，且与韧带直径平方的倒数成比例。这种依赖关系符合由表面碰撞激发的电子的预期。对于10 nm的小韧带直径，我们估计受激6sp电子的发射效率为3.14%，而表面受激电子的发射效率达到23%。
英文摘要：
The generation and utilization of hot charge carriers in plasmonic materials have emerged as a topic of significant importance, with profound implications across multiple disciplines, including optoelectronics, photovoltaics, photocatalysis, and sensing. In this study, we investigate the hot electron transfer from nanoporous gold (npAu) in dependence of the structure size, utilizing both the nanoscale feature size and the interconnected nature of this material. We employ photoelectron injection from nanoporous gold into the electrolyte under UV illumination as a test electron transfer process. Nanoporous gold thin films with sub-10 nm initial ligament diameter are stepwise coarsened by potential cycles in a photoelectrochemical setup, thereby allowing us to precisely probe the influence of ligament diameter on the photocurrent response. The resulting ligament diameter variations are confirmed by scanning electron microscopy (SEM) analysis. As the ligament diameter increased from 8 to 16 nm, there was a corresponding decrease in quantum efficiency proportional to the inverse ligament diameter squared. Such dependency is expected for electrons excited by surface collisions. For the small ligament diameter of 10 nm we estimate an emission efficiency of excited 6sp electrons as 3.14%, reaching 23% for the surface excited electrons.
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