Effective medium theory characterization of Au/Ag nanoalloy porous alumina composites

被引：32

作者：

Hornyak, GL ^{[1
]}

Patrissi, CJ ^{[1
]}

Oberhauser, EB ^{[1
]}

Martin, CR ^{[1
]}

Valmalette, JC ^{[1
]}

Lemaire, L ^{[1
]}

Dutta, J ^{[1
]}

Hofmann, H ^{[1
]}

机构：

[1] ECOLE POLYTECH FED LAUSANNE,LTP DMX,CH-1015 LAUSANNE,SWITZERLAND

来源：

NANOSTRUCTURED MATERIALS | 1997年 / 9卷 / 1-8期

关键词：

D O I：

10.1016/S0965-9773(97)00127-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The optical constants n(Al) and k(Al) of a 50/50 volume fraction Au/Ag alloy were derived synthetically by application of a Bruggeman (BG) effective medium expression. The alloy data base was then input into a Maxwell-Garnett (MG) effective medium expression to determine the absorption maximum of the nano-alloy/insulator composite (the volume fraction of the nano-alloy was equal to 5%). The absorption maximum (lambda(max)) of the hypothetical composite was found to be 499 nm for spherical particles and was blue-shifted relative to that of a composite containing pure gold nanospheres (499 vs. 528 nm respectively). The transmission color at this wavelength was a red-orange. lambda(max) in the range 512 to 519 nm (Au/Ag alloy between 60/40 - 70/30 volume fraction respectively) is needed to obtain the scarlet-red exhibited by the famous Lycurgus cup of 4th century Rome (1). (C) 1997 Acta Metallurgica Inc.

引用

页码：571 / 574

页数：4

共 4 条

[1] AN INVESTIGATION OF THE ORIGIN OF THE COLOR OF THE LYCURGUS CUP BY ANALYTICAL TRANSMISSION ELECTRON-MICROSCOPY [J].

BARBER, DJ ;

FREESTONE, IC .

ARCHAEOMETRY, 1990, 32 :33-45

[2] Calculation of various physics constants in heterogenous substances I Dielectricity constants and conductivity of mixed bodies from isotropic substances [J].

Bruggeman, DAG .

ANNALEN DER PHYSIK, 1935, 24 (07) :636-664

[3] TEMPLATE-SYNTHESIZED NANOSCOPIC GOLD PARTICLES - OPTICAL-SPECTRA AND THE EFFECTS OF PARTICLE-SIZE AND SHAPE [J].

FOSS, CA ;

HORNYAK, GL ;

STOCKERT, JA ;

MARTIN, CR .

JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (11) :2963-2971

[4]

Maxwell-Garnett J C, 1904, PHILOS T ROY SOC LON, V203, P385, DOI DOI 10.1098/RSTA.1904.0024

← 1 →