Electrochemical sensors based on porous nanocomposite films with weak polyelectrolyte-stabilized gold nanoparticles

Sungwoo Kim, Younghoon Kim, Yongmin Ko, Jinhan Cho

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Porous hybrid multilayer films composed of cationic poly(allylamine hydrochloride) (PAH)- and anionic poly(acrylic acid) (PAA)-stabilized gold nanoparticles (AuNPs) (i.e., PAH-AuNPs and PAA-Au NPs) were prepared on indium tin oxide (ITO) electrodes using pH-controlled layer-by-layer (LbL) assembly method with subsequent acid treatment. The exponential growth of AuNP deposition layers was caused by the "in-and-out" diffusion of PAH and PAA chains not bound to AuNPs. Immersion of the films in an acidic solution (pH 2.4) converted the nonporous films to porous films via the disruption of ionic bonds and the rearrangement of free PE chains. In this case, the pH-induced porous films showed high electrochemical activity. Nonporous/dense films were found to prevent direct contact between probe molecules in solution and the catalytic components immobilized on an electrode. Electrodes coated with porous films, however, exhibited higher electrocatalytic activity toward nitric oxide oxidation compared with electrodes coated with nonporous films, despite the same levels of AuNP loading. This work demonstrates that structural transformations via a facile pH treatment can significantly improve electrode sensitivity without the aid of porous supports or additional catalytic components.

Original languageEnglish
Pages (from-to)8008-8013
Number of pages6
JournalJournal of Materials Chemistry
Volume21
Issue number22
DOIs
Publication statusPublished - 2011 Jun 14

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Electrochemical sensors
Nanocomposite films
Polyelectrolytes
Gold
Nanoparticles
Polycyclic aromatic hydrocarbons
Electrodes
carbopol 940
Acids
Multilayer films
Nitric oxide
Tin oxides
Contacts (fluid mechanics)
Indium
Acrylics
Nitric Oxide
Oxidation
Molecules

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

Cite this

Electrochemical sensors based on porous nanocomposite films with weak polyelectrolyte-stabilized gold nanoparticles. / Kim, Sungwoo; Kim, Younghoon; Ko, Yongmin; Cho, Jinhan.

In: Journal of Materials Chemistry, Vol. 21, No. 22, 14.06.2011, p. 8008-8013.

Research output: Contribution to journalArticle

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