Nanoporous silver with controllable optical properties formed by chemical dealloying in supercritical CO2

Rachel Morrish, Anthony J Muscat

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

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 °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 nm). Simultaneous oxidation and chelation produced 100-200 nm 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.

Original languageEnglish (US)
Pages (from-to)3865-3870
Number of pages6
JournalChemistry of Materials
Volume21
Issue number16
DOIs
StatePublished - Aug 25 2009

Fingerprint

Surface plasmon resonance
Chelation
Silver
Optical properties
Metals
Oxidation
Ligaments
Chelating Agents
Absorption spectroscopy
Oxidants
Hydrogen peroxide
Field emission
Hydrogen Peroxide
Energy dispersive spectroscopy
Etching
X ray photoelectron spectroscopy
X ray diffraction
Scanning electron microscopy
X-Ray Emission Spectrometry

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Nanoporous silver with controllable optical properties formed by chemical dealloying in supercritical CO2. / Morrish, Rachel; Muscat, Anthony J.

In: Chemistry of Materials, Vol. 21, No. 16, 25.08.2009, p. 3865-3870.

Research output: Contribution to journalArticle

@article{8f8ce418c43d42f8829344e40a4aba08,
title = "Nanoporous silver with controllable optical properties formed by chemical dealloying in supercritical CO2",
abstract = "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 °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 nm). Simultaneous oxidation and chelation produced 100-200 nm 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.",
author = "Rachel Morrish and Muscat, {Anthony J}",
year = "2009",
month = "8",
day = "25",
doi = "10.1021/cm9015386",
language = "English (US)",
volume = "21",
pages = "3865--3870",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",
number = "16",

}

TY - JOUR

T1 - Nanoporous silver with controllable optical properties formed by chemical dealloying in supercritical CO2

AU - Morrish, Rachel

AU - Muscat, Anthony J

PY - 2009/8/25

Y1 - 2009/8/25

N2 - 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 °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 nm). Simultaneous oxidation and chelation produced 100-200 nm 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.

AB - 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 °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 nm). Simultaneous oxidation and chelation produced 100-200 nm 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.

UR - http://www.scopus.com/inward/record.url?scp=69249172998&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=69249172998&partnerID=8YFLogxK

U2 - 10.1021/cm9015386

DO - 10.1021/cm9015386

M3 - Article

VL - 21

SP - 3865

EP - 3870

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 16

ER -