Journal
ELECTROCHIMICA ACTA
Volume 172, Issue -, Pages 7-11Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.01.026
Keywords
Graphene quantum dot; Gold nanoparticles; Heavy metal detection; Anodic stripping voltammetry
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Funding
- AcRF Tier 2 grants from Ministry of Education of Singapore [MOE2011-T2-2-010, MOE2014-T2-1-003]
- GlobalFoundries (Singapore)
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Graphene quantum dots (GQDs) are emerging zero dimensional materials promising various novel applications due to their extraordinary physicochemical properties. In this work, novel conjugates of GQDs and gold nanoparticles (AuNPs) are synthesized and used for sensitive electrochemical detection of heavy metal ions (Hg2+ and Cu2+). Ultralow detection limit (0.02 nM with S/N = 6.25 for Hg2+ and 0.05 nM with S/N = 4.81 for Cu2+) and high sensitivity (2.47 mu A/nM for Hg2+ and 3.69 mu A/nM for Cu2+) have been achieved. (C) 2015 Elsevier Ltd. All rights reserved.
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