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Abstract
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Conducting polymers such as polyaniline (PANI) and their derivatives has been widely
investigated as chemical sensors due to fast response, low cost and operation at room
temperature.
Graphene, a new class of 2D carbon nanomaterials with one atom thickness, has attracted
considerable attention in recent years [1] and could be composited to conductive for the
construction of new sensors. Graphene sheets smaller than 100 nm are called graphene
quantum dots. Due to high surface area, unique electronic properties and biocompatibility,
GQDs have been used frequently in bioimaging, electronic devices and biosensing [2, 3].
In this study a novel electrochemical Bisphenol A (BPA) sensor based on
PANI/GQDs/AuNPs nanocomposite modified carbon ceramic electrode (CCE) was
developed. The PANI/GQDs/AuNPs/CCE was constructed as follow: Firstly, PANI/GQDs
nanocomposite was electrodeposited by cyclic voltammetry on the surface of CCE.
Afterward, Au nanoparticles was electrodeposited on the surface of prepared
PANI/GQDs/CCE. Scanning electron microscope, XRD spectrum and Fourier transform
infrared spectrum demonstrated that PANI/GQDs/AuNPs composite was successfully
electrodeposited onto the CCE surface. The electrochemical activity of CCE were
significantly improved after modification, as was indicated by cyclic voltammetry tests. The
fabricated sensor responds efficiently to BPA over the concentration range of 50 to 1300 nM
with the detection limit of 22 nM and sensitivity of 47 μA μM-1. The results indicate the
suitability of PANI/GQDs/AuNPs/CCE for sensitive determination of BPA in water samples
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