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Electrogenerated chemiluminescence of luminol on a gold nanocluster-graphene-Nafion composite-modified electrode in neutral aqueous solution

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Title
Electrogenerated chemiluminescence of luminol on a gold nanocluster-graphene-Nafion composite-modified electrode in neutral aqueous solution
Author(s)
Jaeyoon Kim; Hanseok Yi; Daeho Jeong; Dongil Lee; Won-Yong Lee
Subject
CATHODIC ELECTROCHEMILUMINESCENCE, ; HYDROGEN-PEROXIDE, ; NANOPARTICLES, ; OXYGEN, ; BIOSENSOR, ; GLUCOSE, ; REDUCTION, ; CATALYSIS, ; IRON(II), ; CLUSTER
Publication Date
2021-01-15
Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v.881
Publisher
ELSEVIER SCIENCE SA
Abstract
The electrogenerated chemiluminescence (ECL) behavior of luminol on a glassy carbon (GC) electrode modified with gold nanocluster-graphene-Nafion composite films has been investigated in neutral aqueous solution (pH 7). In the present study, atomically well-defined gold nanoclusters of Au-25(SC6H13)(18), where SC6H13 is hexanethiolate, were used for the preparation of composite films. Due to the highly enhanced electrocatalytic activity of the composite towards the reduction of molecular oxygen, strong cathodic luminol ECL response related to the electrochemical oxygen reduction was observed on the composite-modified GC electrode at ca. -1.34 V vs. Ag/AgCl (3 M NaCl) in a neutral aqueous solution, while no cathodic ECL response was observed on a bare GC electrode. The addition of hydrogen peroxide led to a decrease in the cathodic luminol ECL response related to the oxygen reduction, whereas a new ECL response related to the electrochemical reduction of hydrogen peroxide was observed at ca. -0.01 V vs. Ag/AgCl (3 M NaCl). The possible ECL mechanisms were discussed. Under the optimum conditions, the ECL response was linear with the concentration of hydrogen peroxide in the range of 1.0 x 10(-8) M similar to 4.0 x 10(-6) M with a detection limit of 2.21 x 10(-9) M (S/N = 3) in neutral aqueous solution.
URI
https://pr.ibs.re.kr/handle/8788114/9433
DOI
10.1016/j.jelechem.2020.114947
ISSN
1572-6657
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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