Use of optical interferometry to measure gold nanoparticle adsorption on silica

Hou, Tingting, Martin, Lisandra L., Horn, Roger G. and Greene, George W. 2016, Use of optical interferometry to measure gold nanoparticle adsorption on silica, Colloids and surfaces a: physicochemical and engineering aspects, vol. 506, pp. 383-392, doi: 10.1016/j.colsurfa.2016.07.022.

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Title Use of optical interferometry to measure gold nanoparticle adsorption on silica
Author(s) Hou, Tingting
Martin, Lisandra L.
Horn, Roger G.
Greene, George W.ORCID iD for Greene, George W.
Journal name Colloids and surfaces a: physicochemical and engineering aspects
Volume number 506
Start page 383
End page 392
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-10-05
ISSN 0927-7757
Keyword(s) optical interferometry
gold nanoparticle adsorption
adsorption kinetics
Summary Adsorption of metal nanoparticles is at the heart of many chemical and biosensor techniques, but there are few approaches that can provide quantitative characterisation of individual nanoparticle films fabricated at different times and/or under different conditions. Using synthesised gold nanoparticles (Au NPs) as a model, the nanoparticle films were investigated using an optical interferometry technique known as fringes of equal chromatic order (FECO), which was further systematically validated against both in situ quartz crystal microbalance (QCM) and ex situ atomic force microscopy (AFM) measurements. The results indicate that the FECO wavelengths has a quantifiable red shift with increasing particle densities, making it possible to quantify the degree of surface coverage via the analysis of the fringe shift at a fixed fringe order. Moreover, the calculated formula between the FECO shifts and the surface coverage allows quantitative analysis of the whole adsorption kinetics investigated. Particularly, the as-proposed FECO technique can successfully monitor the Au NP adsorption in situ, which could be a new versatile technology platform for “online” monitoring method, for example in biosensor applications using Au NP-tagged analytes.
Language eng
DOI 10.1016/j.colsurfa.2016.07.022
Field of Research 030603 Colloid and Surface Chemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID None
Copyright notice ©2016, Elsevier
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Document type: Journal Article
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