Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 150, Issue 2, Pages 491-497Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.09.014
Keywords
Monodispersed Au nanoparticles; Mercury(II); Graphene; Heavy metal; Stripping analysis
Funding
- National Science Foundation of China [20803026]
- Natural Science Foundation of Hubei Province [2008CDB032]
- Ministry of Education of China [108097]
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We demonstrate a new highly sensitive and selective Hg(II) sensor with a graphene-based nanocomposite film as the enhanced sensing platform The platform was constructed by homogenously distributing monodispersed Au nanoparticles (AuNPs) onto the two-dimensional (2D) graphene nanosheet matrix Its surface structure and electrochemical performance were systematically investigated Such a nanostructured composite film platform could combine with the advantages of AuNPs and graphene nanosheets greatly facilitate electron-transfer processes and the sensing behavior for Hg(II) detection leading to a remarkably improved sensitivity and selectivity The detection limit was found to be as low as 6 ppt (S/N = 3) much below the guideline value from the World Health Organization (WHO) The interference from other heavy metal ions such as Cu2+ Cr3+ Co2+ Fe3+ Zn2+ and I- ions associated with mercury analysis could be effectively inhibited The performance of new sensor was also evaluated by the direct detection of Hg(II) in river water specimens suggesting it is very promising for practical environmental monitoring applications (C) 2010 Elsevier B V All rights reserved
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