Plasmonic evolution of atomically size-selected Au clusters by electron energy loss spectrum

• 作者: Siqi Lu Lin Xie Kang Lai Runkun Chen Lu Cao Kuojuei Hu Xuefeng Wang Jinsen Han Xiangang Wan Jianguo Wan Qing Dai Fengqi Song Jiaqing He Jiayu Dai Jianing Chen Zhenlin Wang Guanghou Wang
• 来源期刊: 国家科学评论（英文版）
• 年，卷（期）: 2021,（12）
• 所属期刊栏目: RESEARCH ARTICLES
• 页码范围: 15-23
• 页数: 9页
• 语种: 英文

摘要

The plasmonic response of gold dusters with atom number (N) =100-70000 was investigated using scanning transmission electron microscopy-electron energy loss spectroscopy.For decreasing N,the bulk plasmon remains unchanged above N =887 but then disappears,while the surface plasmon firstly redshifts from 2.4 to 2.3 eV above N =887 before blueshifting towards 2.6 eV down to N =300,and finally splitting into three fine features.The surface plasmon's excitation ratio is found to follow N0.669,which is essentially R2.An atomically precise evolution picture ofplasmon physics is thus demonstrated according to three regimes:classical plasmon (N =887-70000),quantum confinement corrected plasmon (N =300-887)and molecule related plasmon (N ＜ 300).