Kinetics of gold nanoparticle aggregation: Experiments and modeling

Taehoon Kim, Chang-Ha Lee, Sang Woo Joo, Kangtaek Lee

Research output: Contribution to journalArticle

149 Citations (Scopus)

Abstract

We investigate the aggregation kinetics of gold nanoparticles using both experimental techniques (i.e., quasi-elastic light scattering, UV-visible spectroscopy, and transmission electron microscopy) and mathematical modeling (i.e., constant-number Monte Carlo). Aggregation of gold nanoparticles is induced by replacing the surface citrate groups with benzyl mercaptan. We show that the experimental results can be well described by the model in which interparticle interactions are described by the classical DLVO theory. We find that final gold nanoparticle aggregates have a fractal structure with a mass fractal dimension of 2.1-2.2. Aggregation of approximately 11 initial gold nanoparticles appears to be responsible for the initial color change of suspension. This kinetic study can be used to predict the time required for the initial color change of a gold nanoparticle suspension and should provide insights into the design and optimization of colorimetric sensors that utilize aggregation of gold nanoparticles.

Original languageEnglish
Pages (from-to)238-243
Number of pages6
JournalJournal of Colloid and Interface Science
Volume318
Issue number2
DOIs
Publication statusPublished - 2008 Feb 15

Fingerprint

Gold
Agglomeration
gold
Nanoparticles
nanoparticles
Kinetics
kinetics
Experiments
fractals
Suspensions
Color
color
Elastic scattering
Fractal dimension
citrates
Sulfhydryl Compounds
thiols
Citric Acid
Fractals
Light scattering

All Science Journal Classification (ASJC) codes

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

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Kinetics of gold nanoparticle aggregation : Experiments and modeling. / Kim, Taehoon; Lee, Chang-Ha; Joo, Sang Woo; Lee, Kangtaek.

In: Journal of Colloid and Interface Science, Vol. 318, No. 2, 15.02.2008, p. 238-243.

Research output: Contribution to journalArticle

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