Article ID Journal Published Year Pages File Type
189557 Electrochimica Acta 2011 10 Pages PDF
Abstract

Observation of the oxidation–reduction processes occurring at the nanoelectrode–solution interface demonstrates how electrochemical behavior depends upon nanoelectrode size. The use of a modified form of pulsed laser ablation as an improved method to synthesize nanometer-scaled electrode materials easily and consistently is reported. This method of fabrication enables platinum metal nanoparticles averaging 3 nm in diameter and approximately 5.0 × 1011 particles/cm2 to be deposited onto silicon substrates using optimum ablation parameters. A platinum silicide phase exists at the interface of the platinum and silicon as a result of the ablation process. Electrochemical results demonstrate the presence of a large number of isolated platinum particles (1.1 × 107 particles/cm2), separated by an average edge to edge distance of 14 nm, which are electrochemically active nanoelectrodes.

► Fabrication of Pt nanoparticles using the method of through thin film ablation results in an isolated array of nanoelectrodes. ► Characterization of the array is consistent for isolated nanoelectrodes where the diffusional profiles do not overlap. ► Enhancements of the limits of detection as an electrochemical sensor are amplified due to the large number of isolated nanoelectrodes in the array.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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