Nanoporous Silver with Controllable Optical Properties Formed by Chemical Dealloying in Supercritical CO2

被引：42

作者：

Morrish, Rachel ^{[1
]}

Muscat, Anthony J. ^{[1
]}

机构：

[1] Univ Arizona, Dept Chem & Environm Engn, Tucson, AZ 85721 USA

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 16期

关键词：

CARBON-DIOXIDE; SELECTIVE DISSOLUTION; GOLD ELECTRODES; POROUS GOLD; METAL; COPPER; FILMS; AG; CU; FABRICATION;

D O I：

10.1021/cm9015386

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanoporous Ag was formed by selectively etching Cu from multiphase AgCu alloys using the oxidant hydrogen peroxide and the metal chelator hexafluoroacetylacetone (hfacH, 14 mM) dissolved in supercritical CO2 (60 degrees C and 16 MPa), The Ag films were characterized using X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and ultraviolet-visible absorption spectroscopy. Sequential oxidation and chelation produced 50-100 nm Ag ligaments that exhibited an asymmetric localized Surface plasmon resonance (LSPR) peak in the green range (500-570 rim), Simultaneous oxidation and chelation produced 100-200 run faceted Ag particles that exhibited a broader, symmetric LSPR peak centered in the red range (600-700 nm). Dealloying of phase domains containing Cu concentrations as low as 24 at % was possible. These results demonstrate a means for large-scale and low environmental footprint preparation of nanoporous metals with controllable optical properties.

引用

页码：3865 / 3870

页数：6

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