The colours of nanometric gold - Optical response functions of selected gold-cluster thiolates

被引：113

作者：

Wyrwas, R. B. ^{[1
]}

Alvarez, M. M.

Khoury, J. T.

Price, R. C.

Schaaff, T. G.

Whetten, R. L.

机构：

[1] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA

[2] Indiana Univ, Dept Chem, Bloomington, IN 47405 USA

[3] Los Angeles Cty Sanit Dist, Div Res, Los Angeles, CA 90607 USA

[4] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA

来源：

EUROPEAN PHYSICAL JOURNAL D | 2007年 / 43卷 / 1-3期

关键词：

D O I：

10.1140/epjd/e2007-00117-6

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A set of broad-range NIR-vis-UV optical absorption spectra, measured for selected gold-cluster thiolate compounds (GCTs, containing similar to 20 to 300 Au atoms), is consistently displayed and then analyzed within the dielectric-functions approach. The size-evolution toward 'bulk' (Au diameter > 3-nm) optical response is thereby clearly demonstrated. The emergence of apparent energy gaps, E-on, for onset of optical absorption, as well as other fine-structure, is consistent with that of a well-quantized metallic electronic structure for the compounds' cores: the onset-band's location E-on and intensity are attributed semiclassically to a circulation-frequency resonance of the Fermi-level electrons. With decreasing cluster-size, an increasing fraction of the integrated (sum-rule) intensity is 'missing' from the < 4 eV region. This might be explained by the outermost layer consisting of Au(I)thiolate complexes.

引用

页码：91 / 95

页数：5

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