Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 90, Issue -, Pages 53-57Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2011.09.047
Keywords
Gold nanoparticles; Nanostructured film; Polyeugenol; Lignin; NADH
Funding
- Poznan University of Technology [DS 31-223/2011]
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Eugenol (2-methoxy-4-allyl-phenol) was used as a reducing agent for one-pot synthesis of gold nanopartidies in a mild alkaline aqueous/organic solution at room temperature. In this reaction, eugenol acts also as a stabilizing agent, since it undergoes polymerization upon oxidation. As a result, stable colloids of polyeugenol (PE)-capped gold nanoparticles are formed during the reaction with the average particle size of 44 nm. Moreover, conducting supports, such as ITO glass, are covered by Au/PE composite film when immersed in the reaction medium. The modified ITO shows redox activity assignable to residual quinone moieties of PE with redox couples at a potential range of -0.2 to 0.4V (vs. Ag/AgCl at pH 7.4). Redox properties of Au/PE nanoparticulate films can be exploited for the electrocatalytic oxidation of NADH with over 0.5 V reduction of the reaction overpotential vs. unmodified ITO. Nanoparticulate composite films were characterized by UV-vis spectroscopy. XPS and FT-IR spectroscopy. The characterization revealed structural similarity of the formed PE to lignin. (C) 2011 Elsevier B.V. All rights reserved.
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