Electrochemically Deposited Sol-Gel Based Nanoparticle-Imprinted Matrices for the Size-Selective Detection of Gold Nanoparticles

Netta Bruchiel-Spanier, Gianmarco Giordano, Atzmon Vakahi, Massimo Guglielmi, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Nanoparticles imprinted matrices (NAIMs) is a new approach, in which nanoparticles (NPs) are imprinted in a matrix followed by their removal to form highly selective voids that can recognize the original NPs. In this study, the effect of a sol-gel matrix on the imprinting and reuptake of gold nanoparticles (AuNPs) is examined. Specifically, indium tin oxide (ITO) films were modified with a positively charged polymer, on which the negatively charged AuNPs stabilized with citrate (AuNPs-cit) were adsorbed. This was followed by the electrochemical deposition of sol-gel matrices with different thicknesses and functional groups onto the ITO/AuNPs-cit. Electrochemical oxidation dissolved the AuNPs-cit and formed cavities in the sol-gel films, which fit both the size and shape of the AuNPs-cit. Reuptake of these NPs from an aqueous solution was successful using the imprinted films, whereas the non-imprinted films did not re-uptake the AuNPs-cit. Furthermore, the thickness of the sol-gel layers as well as the type of the silanes that were deposited play an important role on the recognition ability of the NAIM. Finally, we found that the NAIMs are selective, and larger AuNPs-cit were not recognized by the imprinted matrix.

Original languageAmerican English
Pages (from-to)5612-5619
Number of pages8
JournalACS Applied Nano Materials
Volume1
Issue number10
DOIs
StatePublished - 26 Oct 2018

Bibliographical note

Publisher Copyright:
Copyright © 2018 American Chemical Society.

Keywords

  • electrochemistry
  • focused ion beam
  • imprinting
  • nanoparticles
  • sol-gel

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