Solution ionic strength effect on gold nanoparticle solution color transition

Unmodified and modified gold nanoparticles are proposed as sensors using the red to blue transition as an indicator. This work indicates that ionic content is an important variable to track in analytical samples and during the sensor fabrication processes. Mono and multivalent salts where the titran...

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Bibliographic Details
Published in:Talanta (Oxford) 2006-06, Vol.69 (4), p.873-876
Main Authors: Burns, C., Spendel, W.U., Puckett, S., Pacey, G.E.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
General, instrumentation
Gold nanoparticles
Ionic strength
Surface plasmons
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Summary:Unmodified and modified gold nanoparticles are proposed as sensors using the red to blue transition as an indicator. This work indicates that ionic content is an important variable to track in analytical samples and during the sensor fabrication processes. Mono and multivalent salts where the titrants for a standard gold nanoparticle solution. Multivalent cation salt titrants exhibited a greater sensitivity to color change than monovalent cation salts. The data suggest that specific surface adsorption is the predominant mechanism for the red to blue color change not aggregation. The 3–7 nm Debye length for divalent cations versus the 0.5–1.5 nm for monovalent cations indicates surface electrodynamic resonance effects are an important factor in the observed color changes.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2005.11.038