An electrochemically reduced graphene oxide chemiresistive sensor for sensitive detection of Hg2+ ion in water samples

JOURNAL OF HAZARDOUS MATERIALS

卷:320

Article

Tan, Feng¹  Cong, Longchao¹  Saucedo, Nuvia Maria²  Gao, Jinsuo¹  Li, Xiaona¹  Mulchandani, Ashok² 

[1] Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn MOE, Dalian 116024, Peoples R China

[2] Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA

关键词: Reduced graphene oxide;    Electrochemical;    Mercury(II) ion;    Environment monitoring;    Aptamer;   

DOI  :  10.1016/j.jhazmat.2016.08.029

来源: Elsevier

【 摘 要 】

Divalent mercuric (Hg2+) ion is one of the most prevalent forms of mercury species in waters with high toxicity and bioaccumulation in the human body, for which sensitive and selective detection methods are highly necessary to carry out its recognition and quantification. Here an electrochemically reduced graphene oxide (RGO) based chemiresistive sensor was constructed and used for the detection of Hg2+ ion in various water samples. Monolayer GO sheets were assembled onto interdigitated electrodes, followed by reduction through linear sweep voltammetry and then modification with a single-stranded DNA aptamer. The electrochemically derived RGO based sensor showed selective response to as low as 0.5 nM Hg2+ ion in presence of other metal ions and matrices. A comparison between chemiresistive sensors prepared with electrochemically and chemically derived RGO showed that the former had better response performance for sensing Hg2+ ion. The proposed method provides a simple tool for rapid, selective and sensitive monitoring of Hg2+ ion in environmental samples. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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