离域电子
化学
纳米团簇
含时密度泛函理论
化学物理
吸收(声学)
分子物理学
等离子体子
密度泛函理论
光电子学
计算化学
材料科学
光学
物理
有机化学
作者
Qiong Wu,Chengcheng Liu,Cheng Cui,Long Li,Yang Lu,Yuan Liu,Hoda Safari Yazd,Shujuan Xu,Xiang Li,Zhuo Chen,Weihong Tan
摘要
Quantum-size metal clusters with multiple delocalized electrons could support collective plasmon excitation, and thus, theoretically, coupling of plasmons in the few-atom limit might exist between assembled metal clusters, while currently few experimental observations about this phenomenon have been reported. Here we examined the optical absorption of DNA-templated Ag nanoclusters (DNA-AgNCs) assembled through DNA hybridization and found their absorption peaks were sensitive to the assembled distances, which share common characteristics with classical plasmon coupling. Dipolar charge distribution, multiple transition contributed optical absorption, and strongly enhanced electric field simulated by time-dependent density functional theory (TDDFT) indicated the origin of the absorption of individual DNA-AgNCs is a plasmon. The consistency of the peak-shifting trend between experimental and simulation results for assembled DNA-AgNCs suggested the possible presence of plasmon coupling. Our data imply the possibility for quantum-size structures to support plasmon coupling and also show that DNA-AgNCs possess the potential to be promising materials for construction of plasmon-coupling devices with ultrasmall size, site-specific and stoichiometric binding abilities, and biocompatibility.
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