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Title: Optical and chemical observations on gold-mercury nanoparticles in aqueous solution

Abstract

The {gamma}-radiolytic reduction of Hg{sup 2+} in aqueous solution in the presence of 0.3 M 2-propanol first leads to Hg{sub 2}{sup 2+} ({epsilon}{sub 237 nm} = 3.2 x 10{sup 4} M{sup {minus}1} cm{sup {minus}1}), and later to colloidal mercury. When the reduction is carried out in the presence of colloidal gold nanoparticles, Hg{sub 2}{sup 2+} does not appear as an intermediate, and Hg{sub 2}{sup 2+} formed in the absence of gold does not react with added gold colloid. These effects are understood in terms of the reaction of a precursor, Hg{sup +}, with the gold particles. The optical absorption spectra of the resulting mercury containing gold particles are reported for various Au/Hg ratios. The plasmon absorption band of gold is blue-shifted and damped, and a broad absorption band develops around 360 nm with increasing mercury content. The mercury of the composite particles is slowly reoxidized upon exposure of the solution to air. Excess Hg{sup 2+} ions in solution extract adsorbed mercury in the form of Hg{sub 2}{sup 2+}. Both the absorption spectra and electron micrographs of the gold particles are interpreted by a rather weak penetration of mercury into the particles and formation of a rather labile mercury layer aroundmore » them.« less

Authors:
;
Publication Date:
Research Org.:
Univ. of Notre Dame, IN (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20075912
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical
Additional Journal Information:
Journal Volume: 104; Journal Issue: 21; Other Information: PBD: 1 Jun 2000; Journal ID: ISSN 1089-5647
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; RADIOLYSIS; REDUCTION; COLLOIDS; GOLD; MERCURY; AQUEOUS SOLUTIONS; ADSORPTION; SPECTRA; PLASMONS

Citation Formats

Henglein, A., and Giersig, M. Optical and chemical observations on gold-mercury nanoparticles in aqueous solution. United States: N. p., 2000. Web. doi:10.1021/jp993682p.
Henglein, A., & Giersig, M. Optical and chemical observations on gold-mercury nanoparticles in aqueous solution. United States. doi:10.1021/jp993682p.
Henglein, A., and Giersig, M. Thu . "Optical and chemical observations on gold-mercury nanoparticles in aqueous solution". United States. doi:10.1021/jp993682p.
@article{osti_20075912,
title = {Optical and chemical observations on gold-mercury nanoparticles in aqueous solution},
author = {Henglein, A. and Giersig, M.},
abstractNote = {The {gamma}-radiolytic reduction of Hg{sup 2+} in aqueous solution in the presence of 0.3 M 2-propanol first leads to Hg{sub 2}{sup 2+} ({epsilon}{sub 237 nm} = 3.2 x 10{sup 4} M{sup {minus}1} cm{sup {minus}1}), and later to colloidal mercury. When the reduction is carried out in the presence of colloidal gold nanoparticles, Hg{sub 2}{sup 2+} does not appear as an intermediate, and Hg{sub 2}{sup 2+} formed in the absence of gold does not react with added gold colloid. These effects are understood in terms of the reaction of a precursor, Hg{sup +}, with the gold particles. The optical absorption spectra of the resulting mercury containing gold particles are reported for various Au/Hg ratios. The plasmon absorption band of gold is blue-shifted and damped, and a broad absorption band develops around 360 nm with increasing mercury content. The mercury of the composite particles is slowly reoxidized upon exposure of the solution to air. Excess Hg{sup 2+} ions in solution extract adsorbed mercury in the form of Hg{sub 2}{sup 2+}. Both the absorption spectra and electron micrographs of the gold particles are interpreted by a rather weak penetration of mercury into the particles and formation of a rather labile mercury layer around them.},
doi = {10.1021/jp993682p},
journal = {Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical},
issn = {1089-5647},
number = 21,
volume = 104,
place = {United States},
year = {2000},
month = {6}
}