Silver nanoparticles (AgNPs) were
synthesized separately and loaded
onto the expanded layers of exfoliated graphite (EG) to form a silver
nanoparticle-exfoliated graphite nanocomposite (AgNPs-EG). The AgNPs-EG
was compressed into a pellet (0.6 cm in diameter) and used to prepare
an electrochemical sensor for bisphenol A (BPA) in standard samples
and in thermal paper. The synthesized materials were characterized
by ultraviolet–visible spectrophotometry, X-ray diffraction
spectroscopy, scanning electron microscopy, and energy-dispersive
X-ray. The electrochemical behavior of BPA on the AgNPs-EG sensor
was investigated by cyclic voltammetry and square wave voltammetry.
Under optimized experimental conditions, the oxidation peak current
was linearly proportional to bisphenol A concentrations in the range
from 5.0 to100 μM, with a coefficient of determination (
R
2
) of 0.9981. The obtained limit of detection
of the method was 0.23 μM. The fabricated sensor was able to
overcome electrode fouling with good reproducibility (RSD = 2.62%,
n
= 5) by mechanical polishing of the electrode on emery
paper. The proposed method was successfully applied to determine bisphenol
A in thermal paper samples and demonstrated good accuracy of 93.1
to 113% recovery.
A nanocomposite platform of silver nanoparticles and carbon nanofibres (AgCNFs) was used to immobilise a bisphenol A specific 63‐mer ssDNA aptamer to form a biosensor. The fabrication process of the biosensor was studied with electrochemical impedance spectroscopy and cyclic voltammetry in the presence of [Fe(CN)6]3−/4− as redox probe. The biosensor detected bisphenol A in a linear range of 0.1–10 nM, with a limit of detection of 0.39 nM using square wave voltammetry (SWV). The biosensor exhibited good selectivity in the presence of interfering species at 100‐fold concentrations and was used to detect BPA in real water sample.
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