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

Autor: Lu, Siqi, Xie, Lin, Lai, Kang, Chen, Runkun, Cao, Lu, Hu, Kuojuei, Wang, Xuefeng, Han, Jinsen, Wan, Xiangang, Wan, Jianguo, Dai, Qing, Song, Fengqi, He, Jiaqing, Dai, Jiayu, Chen, Jianing, Wang, Zhenlin, Wang, Guanghou
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Zdroj: National Science Review; Dec2021, Vol. 8 Issue 12, p1-9, 9p
Abstrakt: 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 N 0.669, which is essentially R 2. 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). [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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