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In-situ measurement of colloidal gold adsorption on functionalized silica surfaces
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Mazurenka, Mikhail, Hamilton, Suzanne M., Unwin, Patrick R. and Mackenzie, Stuart R. (2008) In-situ measurement of colloidal gold adsorption on functionalized silica surfaces. Journal of Physical Chemistry C, Vol.112 (No.16). pp. 6462-6468. doi:10.1021/jpS00706j
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Official URL: http://dx.doi.org/10.1021/jp800706j
Abstract
Evanescent wave cavity ring-down spectroscopy (EW-CRDS) has been applied to study, in situ, the deposition kinetics of commercially available gold colloids on functionalized silica surfaces from quiescent solution. Neither 5 nor 20 nm citrate-stabilized nanoparticles were observed to adsorb on clean silica surfaces. Adsorption on a poly-L-lysine-functionalized surface, however, occurs readily and irreversibly with the kinetics of adsorption differing markedly for the two particle sizes studied. 5 nm particles adsorb to form a highly disperse submonolayer of individual particles with atomic force microscope images showing no evidence of aggregation. The controlled growth of multilayer nanoparticle/polyelectrolyte films is demonstrated by alternately depositing colloidal particles and poly-L-lysine films. The deposition of multilayer nanoparticle films increases the sensitivity of the functionalized surface to changes in the solvent refractive index. The adsorption kinetics of the 20 nm colloid is more complex than that of the smaller colloid with adsorbed particles acting as nucleation sites for subsequent aggregation with the result that the interfacial absorbance continues to increase indefinitely with time.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry | ||||
| Divisions: | Faculty of Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Colloidal gold -- Absorption and adsorption, Cavity-ringdown spectroscopy, Nanoparticles, Silica -- Surfaces, Interfaces (Physical sciences) | ||||
| Journal or Publication Title: | Journal of Physical Chemistry C | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 1932-7447 | ||||
| Official Date: | 24 April 2008 | ||||
| Dates: |
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| Volume: | Vol.112 | ||||
| Number: | No.16 | ||||
| Number of Pages: | 7 | ||||
| Page Range: | pp. 6462-6468 | ||||
| DOI: | 10.1021/jpS00706j | ||||
| Status: | Not Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) |
Data sourced from Thomson Reuters' Web of Knowledge
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