Label-free in situ optical monitoring of the adsorption of oppositely charged metal nanoparticles

Beatrix Peter, Sandor Kurunczi, Daniel Patko, Istvan Lagzi, Bartlomiej Kowalczyk, Zoltán Rácz, Bartosz A. Grzybowski, Robert Horvath

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The mechanism of alternating deposition of oppositely charged gold nanoparticles (AuNPs) was investigated by optical waveguide lightmode spectroscopy (OWLS). OWLS allows monitoring of the kinetics of layer-by-layer (LbL) adsorption of positively and negatively charged nanoparticles in real time without using any labels so that the dynamics of layer formation can be revealed. Positively charged NPs that are already deposited on a negatively charged glass substrate strongly facilitate the adsorption of the negatively charged particles. The morphology of the adsorbed layer was also investigated with atomic force microscopy (AFM). AFM revealed that the interaction between oppositely charged particles results in the formation of NP clusters with sizes varying between 100 and 6000 NPs. The cluster size distribution is found to be an exponentially decaying function, and we propose a simple theory to explain this finding.

Original languageEnglish
Pages (from-to)13478-13482
Number of pages5
JournalLangmuir
Volume30
Issue number44
DOIs
Publication statusPublished - Nov 11 2014

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Metal Nanoparticles
Metal nanoparticles
Atomic Force Microscopy
Optical waveguides
Charged particles
Nanoparticles
Adsorption
Labels
Atomic force microscopy
Spectrum Analysis
Spectroscopy
nanoparticles
adsorption
Monitoring
optical waveguides
Gold
metals
Glass
charged particles
atomic force microscopy

ASJC Scopus subject areas

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

Cite this

Label-free in situ optical monitoring of the adsorption of oppositely charged metal nanoparticles. / Peter, Beatrix; Kurunczi, Sandor; Patko, Daniel; Lagzi, Istvan; Kowalczyk, Bartlomiej; Rácz, Zoltán; Grzybowski, Bartosz A.; Horvath, Robert.

In: Langmuir, Vol. 30, No. 44, 11.11.2014, p. 13478-13482.

Research output: Contribution to journalArticle

Peter, Beatrix ; Kurunczi, Sandor ; Patko, Daniel ; Lagzi, Istvan ; Kowalczyk, Bartlomiej ; Rácz, Zoltán ; Grzybowski, Bartosz A. ; Horvath, Robert. / Label-free in situ optical monitoring of the adsorption of oppositely charged metal nanoparticles. In: Langmuir. 2014 ; Vol. 30, No. 44. pp. 13478-13482.
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