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Highly‐sensitive Electrochemical Sensor for Cd 2+ and Pb 2+ Based on the Synergistic Enhancement of Exfoliated Graphene Nanosheets and Bismuth
Author(s) -
Wang Jiao,
Chen Xuerong,
Wu Kangbing,
Zhang Miao,
Huang Wensheng
Publication year - 2016
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201500447
Subject(s) - graphene , exfoliation joint , electrochemistry , stripping (fiber) , bismuth , electrochemical gas sensor , materials science , nuclear chemistry , electrode , detection limit , analytical chemistry (journal) , anodic stripping voltammetry , anode , chemistry , nanotechnology , metallurgy , chromatography , composite material
Graphene nanosheets (GS) were prepared via ultrasonic exfoliation, and used to modify glass carbon electrode (GCE). Compared with GCE, the GS‐modified GCE (GS/GCE) greatly increased the anodic stripping peak currents of Cd 2+ and Pb 2+ . Moreover, the response signals of Cd 2+ and Pb 2+ on GS/GCE further enhanced remarkably in the presence of Bi 3+ . Based on the synergistic enhancement effects of GS and Bi 3+ , a novel electrochemical sensor was developed for Cd 2+ and Pb 2+ . The detection limits were 0.35 and 0.045 μg L −1 for Cd 2+ and Pb 2+ . It was used in food sample analysis, and the accuracy was tested by ICP‐MS.