Journal
ANALYTICAL CHEMISTRY
Volume 83, Issue 9, Pages 3244-3247Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac200384w
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Funding
- Ministry of Education, Science and Technology [R32-2008-000-10217-0, 2009-0093823, 2010-0009244]
- Yonsei University
- Ministry of Education, Science & Technology (MoST), Republic of Korea [R32-2008-000-10217-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper describes the electrocatalytic activity of quantum-sized thiolate protected Au(25) nanoparticles and their use in electrochemical sensing. The Au(25) film modified electrode exhibited excellent mediated electrocatalytic activity that was utilized for amperometric sensing of biologically relevant analytes, namely, ascorbic acid and uric acid. The electron transfer dynamics in the Au(25) film was examined as a function of Au(25) concentration, which manifested the dual role of Au(25) as an electronic conductor as well as a redox mediator. The electron transfer study has further revealed the correlation between the electronic conductivity of the Au(25) film and the sensing sensitivity.
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