Nanoparticle-imprinted polymers for size-selective recognition of nanoparticles

Shlomit Kraus-Ophir, Julia Witt, Gunther Wittstock, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Citrate-stabilized gold nanoparticles 15 nm and 33 nm in diameter were transferred concomitantly with a monolayer of positively charged polyaniline by Langmuir-Blodgett transfer at pH 5 onto a conducting indium-doped tin oxide (ITO) support. Films consisting of one to three layers of polyaniline with thicknesses of 1-3 nm were prepared and characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy. After electro-oxidation of the Au nanoparticles in 0.1 M KCl, cavities were left behind in the film that could be analyzed by SEM. These cavities were able to recapture analyte nanoparticles from a solution of pH 10 and showed size-exclusion properties. The amount of nanoparticles taken up by the cavities was conveniently analyzed by measuring the charge associated with the electro-oxidation of these particles in 0.1 M KCl after the film had been rinsed with water. The size-exclusion properties improved with the number of Langmuir-Blodgett layers transferred. Suitable refills: Gold nanoparticles transferred together with monolayers of polyaniline onto a conducting substrate can be electro-oxidized leaving behind cavities of uniform size in the polymer films. The cavities show size-exclusion properties and the films can be used as an analytical tool for the recognition of nanoparticles.

Original languageAmerican English
Pages (from-to)294-298
Number of pages5
JournalAngewandte Chemie - International Edition
Volume53
Issue number1
DOIs
StatePublished - 3 Jan 2014

Keywords

  • analytical methods
  • imprinting
  • nanoparticles
  • size-selective recognition
  • thin films

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