Two-dimensional periodic Au nanoparticle arrays were constructed on TiO₂ thin films by a micelle lithography method and seed-mediated photoelectrochemical growth. Their adjustable interparticle distance allows investigation of a particle size effect on plasmon-induced charge separation (PICS) efficiencies without interference from particle aggregation or plasmon coupling. External or internal PICS efficiencies were found to increase and decrease, respectively, with an increase in particle diameter from 25 to 38 nm. Improvement of the contact between Au nanoparticles and TiO₂ by annealing enhanced the intensity of a plasmonic interface mode and both external and internal PICS efficiencies.

中文翻译：

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粒径和退火对自组装金纳米粒子阵列上等离激元诱导的电荷分离的影响

通过胶束光刻法和种子介导的光电化学生长，在TiO ₂薄膜上构建二维周期金纳米颗粒阵列。它们可调节的粒子间距离允许研究粒子尺寸对等离激元诱导的电荷分离（PICS）效率的影响，而不会受到粒子聚集或等离激元耦合的干扰。发现外部或内部PICS效率分别随粒径从25 nm增加到38 nm而增加和降低。通过退火改善金纳米颗粒与TiO ₂之间的接触，可提高等离子体界面模式的强度以及内部和外部PICS效率。