Functionalized gold nanoparticles and films stabilized by in situ formed polyeugenol.
Eugenol (2-methoxy-4-allyl-phenol) was used as a reducing agent for one-pot synthesis of gold nanoparticles 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.
Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Poznan, Poland. grzegorz.milczarek@put.poznan.pl
Grzegorz
G
Milczarek
Aleksander
A
Ciszewski
D015374:Biosensing Techniques / Q000379:methods*; D003102:Colloids / Q000032:analysis / Q000737:chemistry*; D005054:Eugenol / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008031:Lignin / Q000737:chemistry; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000032:analysis / Q000737:chemistry*; D018716:Molecular Mimicry; D009243:NAD / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D010084:Oxidation-Reduction; D010316:Particle Size; D056951:Photoelectron Spectroscopy; D058105:Polymerization; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014867:Water
D003102:Colloids; D014867:Water; D009243:NAD; D005054:Eugenol; D006046:Gold; D008031:Lignin