Open AccessPlasmonic evolution of atomically size-selected Au clusters by electron energy loss spectrum
Author(s) -
Siqi Lu,
Lin Xie,
Lai Kang,
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
Publication year - 2020
Publication title -
national science review
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.433
H-Index - 54
eISSN - 2095-5138
pISSN - 2053-714X
DOI - 10.1093/nsr/nwaa282
Subject(s) - plasmon , surface plasmon , electron energy loss spectroscopy , localized surface plasmon , spectroscopy , atom (system on chip) , materials science , excitation , electron , surface plasmon resonance , atomic physics , molecular physics , physics , transmission electron microscopy , nanotechnology , optoelectronics , nanoparticle , quantum mechanics , computer science , embedded system
The plasmonic response of gold clusters with atom number (N) = 100–70 000 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 of plasmon physics is thus demonstrated according to three regimes: classical plasmon (N = 887–70 000), quantum confinement corrected plasmon (N = 300–887) and molecule related plasmon (N < 300).
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