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Keywords
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Graphenized Pencil Lead, Bisphenol A, Electron Transfer Rate, Differential Pulse
Voltammetry, Active Surface Area
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Abstract
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This study reports a sensitive, reproducible and fast voltammetric Bisphenol A (BPA) sensor based
on graphenized pencil lead electrode (GPLE). The GPLE was prepared by electrochemical exfoliation
of pencil lead electrode (PLE) by applying an optimized potential in acidic media. The prepared
GPLE was characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD)
and electrochemical techniques. Active surface area and electron transfer rate of the prepared
GPLE was improved remarkably in comparison with regular pencil lead electrode. In order to evaluate
the electrocatalytic performance of the GPLE, determination of Bisphenol A in canned food
and plastic bottled drinking water was studied in details using differential pulse voltammetry (DPV)
technique. The fabricated sensor responds efficiently to BPA over the concentration range of 5 to
700 nM with the detection limit of 0.82 nM and sensitivity of 14 A M−1. Low cost, simplicity of
fabrication, renewability, high sensitivity and accuracy makes this electrode as a suitable choice for
rapid determination of BPA in routine and clinical analysis.
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