Abstract Current Response Of Ascorbic Acid Stabilized Copper Essay

1087 Words Oct 10th, 2015 null Page
ABSTRACT Current response of ascorbic acid-stabilized copper (Cu) single nanoparticles (NPs) collision on gold (Au) ultramicroelectrode (UME) surface was observed by the electrocatalytic amplification method. When the applied potential to the UME was 0.4 V, blip (or spike) response of current, which is responsible for the self-oxidation of Cu NP, was obtained. When the applied potential was over 0.5 V, the blip response combined with staircase response was obtained. The blip part indicates the oxidation of Cu NP, and the staircase part indicates the steady-state electrocatalytic reaction by oxidized Cu NPs. Here, the glucose oxidation was used as the electrocatalytic reaction for the observation of single NP collision. The transferred charged per a blip part and the height of a staircase part of the single Cu NP collision signal was investigated to analyze the size distribution and electrocatalytic ability of Cu NPs.
Electrochemical observation of the electrocatalytic or other properties of nanoparticles (NPs) in a single NP level is recently studied by electrocatalytic amplification method by the Allen J. Bard group and many other groups. The detection techniques mostly based on amperometric methods exploiting the electrocatalytic difference between the material of NP and ultramicroelectrode (UME) or potentiometric method measuring open circuit potential change upon the NP adsorption. The amperometric methods can be classified mainly into three classes such as…

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