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Surface assembly and redox dissolution of silver nanoparticles monitored by evanescent wave cavity ring-down spectroscopy

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Schnippering, Mathias, Powell, Hayley V., Zhang, Meiqin, Macpherson, Julie V., Unwin, Patrick R., Mazurenka, Mikhail and Mackenzie, Stuart R.. (2008) Surface assembly and redox dissolution of silver nanoparticles monitored by evanescent wave cavity ring-down spectroscopy. The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol.112 (No.39). pp. 15274-15280. ISSN 1932-7447

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Abstract

The adsorption kinetics of Ag nanoparticles on a silica surface modified with poly-L-lysine (PLL) have been measured in situ by following the interfacial optical absorbance at 405 nm by evanescent wave cavity ring-down spectroscopy (EW-CRDS). Sensitivity toward nanoparticle detection is enhanced due to the plasmon resonance of the Ag nanoparticles. The redox-dissolution kinetics of the immobilized nanoparticles have been investigated by two distinct approaches. First, IrCl62- was generated electrochemically from IrCl63- by a chronoamperometric potential step in a thin-layer cell configuration formed between the silica surface and a Pt macroelectrode. The oxidative dissolution kinetics were obtained by monitoring the EW-CRDS signal as the nanoparticles dissolved. The reaction kinetics were extracted by complementary finite element modeling of diffusional and reaction processes. The second method of dissolution investigated involved the injection of IrCl62- (aq) directly at the surface by means of a microcapillary located close to the evanescent field.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH): Oxidation-reduction reaction, Nanoparticles, Cavity-ringdown spectroscopy, Silver, Adsorption, Surface chemistry
Journal or Publication Title: The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter
Publisher: American Chemical Society
ISSN: 1932-7447
Official Date: 2 October 2008
Volume: Vol.112
Number: No.39
Number of Pages: 7
Page Range: pp. 15274-15280
Identification Number: 10.1021/jp804615m
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), Seventh Framework Programme (European Commission) (FP7)
Grant number: EP/C00907X (EPSRC), 040126 (FP7)
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URI: http://wrap.warwick.ac.uk/id/eprint/29301

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