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Experimental studies on plasmon resonance of Ag nanoparticles on Highly Ordered Pyrolytic Graphite (HOPG)

Title
Experimental studies on plasmon resonance of Ag nanoparticles on Highly Ordered Pyrolytic Graphite (HOPG)
Authors
Lopez-Salido I.Bertram N.Dong C.L.Gantefor G.Young D.K.
Ewha Authors
김영독
Issue Date
2006
Journal Title
Bulletin of the Korean Chemical Society
ISSN
0253-2964JCR Link
Citation
vol. 27, no. 4, pp. 556 - 562
Indexed
SCI; SCIE; SCOPUS; KCI WOS scopus
Abstract
Studies on Ag nanoparticles grown on Highly Ordered Pyrolytic Graphite (HOPG) using HREELS provide different results for smaller and larger particle sizes corresponding to Ag coverages below and above 4 monolayers, respectively. For the larger particles, a positive frequency shift with decreasing particle size and a broadening of the plasmon resonance were observed with decreasing particle size, in line with previous studies on Ag on alumina. For the smaller particles, in contrast, a shift to lower energy with decreasing particle size, and a narrowing of the plasmon resonance with decreasing particle size can be found. The asymmetry of the Ag-features present for Ag coverages above 4 monolayers disappears for Ag coverages below 4 monolayers. The result for the smaller particles can be rationalized in terms of change of the particle growth mode with increasing particle size, which corroborates our STM data, as well as electronic effects due to the metal/support charge transfer.
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자연과학대학 > 화학·나노과학전공 > Journal papers
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