Combined Blip and Staircase Response of Ascorbic Acid-Stabilized Copper Single Nanoparticle Collision by Electrocatalytic Glucose Oxidation

• Published in: Chemistry, an Asian journal an Asian journal, 2016-05, Vol.11 (9), p.1338-1342
• Main Authors: Choi, Yun Dong, Jung, Seung Yeon, Kim, Ki Jun, Kwon, Seong Jung
• Format: Article
• Language: English
• Subjects: Ascorbic Acid - chemistry; Catalysis; Chemistry; Copper - chemistry; current response; electrocatalytic amplification; Electrochemical Techniques; Glucose - chemistry; glucose oxidation; Gold - chemistry; Microelectrodes; nanoparticles; Nanoparticles - chemistry; Oxidation; Oxidation-Reduction; Surface Properties; ultramicroelectrode
• ISSN: 1861-4728; 1861-471X
• DOI: 10.1002/asia.201600015

The current response of the collision of ascorbic acid‐stabilized copper (Cu) single nanoparticles (NPs) on a gold (Au) ultramicroelectrode (UME) surface was observed by using an electrocatalytic amplification method. Here, the glucose oxidation electrocatalyzed by oxidized Cu NPs was used as the indicating reaction. In this system, the NP collision signals were obtained simultaneously by both direct particle electrolysis and electrocatalytic amplification. For example, when the applied potential was high enough for Cu NP oxidation, a blip response combined with a staircase response was observed as a current signal. The blip part in the single Cu NP collision signal indicates the self‐oxidation of a Cu NP, and the staircase part indicates the steady‐state electrocatalytic reaction by oxidized Cu NP. Not so big bang: The collision of ascorbic acid‐stabilized single copper nanoparticles (NPs) on a gold ultramicroelectrode surface was observed by the electrocatalytic amplification method. The blip combined with a staircase response was observed by both self‐oxidation of Cu NPs and electrocatalytic glucose oxidation by oxidized Cu NPs.