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| - A Versatile Surface Modification Scheme for Attaching Metal Nanoparticles onto Gold: Characterization by Electrochemical Infrared Spectroscopy
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| Abstract
| - A simple method for preparing metal nanoparticle films immobilized on gold substrates is described. A varietyof nanoparticle films are characterized by electrochemical infrared reflection-absorption spectroscopy (EC-IRAS) in which the anomalous “negative-absorbance” properties commonly observed in metal particle arrayscan be completely controlled. Such “anti-absorbance” νCO band components obfuscating the EC-IRAS datainterpretation are associated with the complex dielectric behavior induced by metal nanoparticles aggregates.To achieve a well distributed metal nanoparticle array, the substrates were pretreated with 3-mercaptopropyltrimethoxysilane before anchoring gold, platinum or platinum−ruthenium alloy nanoparticles on the goldsubstrates. The prepared nanoparticle films displayed excellent electrochemical properties implying facileelectronic communication through the organic glue matrix between the nanoparticle arrays and the goldsubstrates. Coating of the gold nanoparticle arrays with platinum via copper underpotential deposition (UPD)steps furthermore demonstrates optimal electronic response between the nanoparticle arrays and the underlyingsubstrate. These findings will facilitate better nanoparticle analysis by electrochemical and optical spectroscopicmeans.
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