Control of gold nanoparticle aggregates by manipulation of interparticle interaction

Taehoon Kim, Kangtaek Lee, Myoung Seon Gong, Sang Woo Joo

Research output: Contribution to journalArticle

200 Citations (Scopus)

Abstract

The size of gold nanoparticle aggregates was controlled by manipulating the interparticle interaction. To manipulate the interparticle interaction of gold nanoparticles prepared by citrate reduction, we applied the substitutive adsorption of benzyl mercaptan on the particle surface in the absence of the cross-linking effect. Various experimental techniques such as UV-vis absorption spectroscopy, surface-enhanced Raman scattering, quasi-elastic light scattering, and zeta-potential measurement were used to characterize the nanoparticle aggregates. Our results suggest that the replacement of the trivalent citrate ions adsorbed on the nanoparticle surface with monovalent benzyl mercaptan ions should destabilize the particles, causing aggregation and hence the increase in the size of nanoparticle aggregates. These experimental results were successfully rationalized by the classical DLVO (Derjaguin-Landau-Vervey- Oyerbeek) theory that describes the interparticle interaction and colloidal stability in solution. Our findings suggest that the control of surface potential is crucial in the design of stable gold nanoparticle aggregates.

Original languageEnglish
Pages (from-to)9524-9528
Number of pages5
JournalLangmuir
Volume21
Issue number21
DOIs
Publication statusPublished - 2005 Oct 11

Fingerprint

Gold
manipulators
gold
Nanoparticles
nanoparticles
interactions
citrates
Sulfhydryl Compounds
thiols
Citric Acid
Ions
Elastic scattering
Surface potential
Zeta potential
Ultraviolet spectroscopy
Absorption spectroscopy
Light scattering
Raman scattering
absorption spectroscopy
ions

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Kim, Taehoon ; Lee, Kangtaek ; Gong, Myoung Seon ; Joo, Sang Woo. / Control of gold nanoparticle aggregates by manipulation of interparticle interaction. In: Langmuir. 2005 ; Vol. 21, No. 21. pp. 9524-9528.
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Control of gold nanoparticle aggregates by manipulation of interparticle interaction. / Kim, Taehoon; Lee, Kangtaek; Gong, Myoung Seon; Joo, Sang Woo.

In: Langmuir, Vol. 21, No. 21, 11.10.2005, p. 9524-9528.

Research output: Contribution to journalArticle

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AU - Kim, Taehoon

AU - Lee, Kangtaek

AU - Gong, Myoung Seon

AU - Joo, Sang Woo

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AB - The size of gold nanoparticle aggregates was controlled by manipulating the interparticle interaction. To manipulate the interparticle interaction of gold nanoparticles prepared by citrate reduction, we applied the substitutive adsorption of benzyl mercaptan on the particle surface in the absence of the cross-linking effect. Various experimental techniques such as UV-vis absorption spectroscopy, surface-enhanced Raman scattering, quasi-elastic light scattering, and zeta-potential measurement were used to characterize the nanoparticle aggregates. Our results suggest that the replacement of the trivalent citrate ions adsorbed on the nanoparticle surface with monovalent benzyl mercaptan ions should destabilize the particles, causing aggregation and hence the increase in the size of nanoparticle aggregates. These experimental results were successfully rationalized by the classical DLVO (Derjaguin-Landau-Vervey- Oyerbeek) theory that describes the interparticle interaction and colloidal stability in solution. Our findings suggest that the control of surface potential is crucial in the design of stable gold nanoparticle aggregates.

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