Journal
TALANTA
Volume 85, Issue 3, Pages 1344-1349Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2011.06.016
Keywords
Monodispersed Au nanoparticles; Graphene; Solid phase extraction (SPE); Stripping voltammetric analysis; Methyl parathion
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Funding
- National Science Foundation of China [20803026]
- CCNU from the Colleges' Basic Research and Operation of MOE [CCNU10A01006]
- Program for Innovation Team of Hubei Province [2009CDA048]
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A sensitive enzymeless organophosphate pesticides COPS) sensor is fabricated by using Au nanoparticles (AuNPs) decorated graphene nanosheets (GNs) modified glassy carbon electrode as solid phase extraction (SPE). Such a nanostructured composite film, combining the advantages of AuNPs with two dimensional GNs, dramatically facilitates the enrichment of nitroaromatic OPs onto the surface and realizes their stripping voltammetric detection of OPs by using methyl parathion (MP) as a model. The stripping voltammetric performances of captured MP were evaluated by cyclic voltammetric and square-wave voltammetric analysis. The combination of the nanoassembly of AuNPs-GNs, SPE, and stripping voltammetry provides a fast, simple, and sensitive electrochemical method for detecting nitroaromatic OPs. The stripping analysis is highly linear over the MP concentration ranges of 0.001-0.1 and 0.2-1.0 mu g mL(-1) with a detection limit of 0.6 ng mL(-1). This designed enzymeless sensor exhibits good reproducibility and acceptable stability. (C) 2011 Elsevier B.V. All rights reserved.
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