Journal
ELECTROCHIMICA ACTA
Volume 111, Issue -, Pages 441-446Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.08.036
Keywords
Graphene; Gold nanoparticles; Electrochemical sensor; Nitric oxide detection; Nanocomposite
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Funding
- AcRF Tier 2 grants from Ministry of Education of Singapore [MOE2011-T2-2-010, MOE2012-T2-2-049]
- NNSF of China [61328401]
- GlobalFoundries (Singapore)
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In this work, we report the preparation of a nanocomposite consisting of gold nanoparticles (AuNPs) electrochemically deposited on electrochemically reduced graphene oxide (ERGO), and its use for sub-micromolar detection of nitric oxide (NO). ERGO network provides highly conductive pathways for electron conduction and a large surface area for catalyst support, while AuNPs act as efficient electrocatalysts toward the oxidation of NO. The synergistic integration of ERGO and AuNP realizes the electrochemical detection of NO with high sensitivity (5.38 mu A/mu M/cm(2)), low detection limit (133 nM with a S/N = similar to 5.5), and a fast response time (3 s). Furthermore, we demonstrate the use of the AuNP-ERGO hybrid electrode to detect the dynamic release of NO from live human umbilical vein endothelial cells (HUVECs). (C) 2013 Elsevier Ltd. All rights reserved.
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