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Electrochemical Detection of Gallic Acid-Capped Gold Nanoparticles Using a Multiwalled Carbon Nanotube-Reduced Graphene Oxide Nanocomposite Electrode
journal contribution
posted on 2019-06-28, 00:00 authored by Hashwin
V. S. Ganesh, Bhargav R. Patel, Hamid Fini, Ari M. Chow, Kagan KermanRecently, a plethora
of ecofriendly methods have been developed
for the synthesis of AuNPs using a multitude of biogenic agents. Polyphenols
from plants are particularly attractive for producing AuNPs because
in addition to helping with the synthesis of AuNPs, the polyphenol
capping of the NPs can be used as a platform for versatile applications.
Polyphenol-capped AuNPs could also make the detection of AuNPs possible,
should they be released into the environment. Because polyphenols
are redox-active, they can be used as a probe to detect AuNPs using
electrochemical techniques. In this work, we have developed an MWCNT-rGO
nanocomposite electrode for the sensitive detection of AuNPs capped
with gallic acid (GA, a green-tea-derived polyphenol) using differential
pulse voltammetry (DPV). The reduction of gallic acid-capped AuNPs
was used as the quantification signal, and the calibration curve displayed
a detection limit of 2.57 pM. Using cyclic voltammetry (CV) and electrochemical
impedance spectroscopy (EIS), we have shown that the modification
of the electrode surface with an MWCNT-rGO hybrid nanocomposite resulted
in a 10-fold increase in current response leading to the sensitive
detection of GA-AuNPs compared to unmodified electrodes. We have also
demonstrated the applicability of the electrochemical sensor in detecting
GA-AuNPs in various analytical matrixes such as human serum and natural
creek water (Highland Creek, ON) with good recovery.
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Keywords
electrochemical impedance spectroscopycyclic voltammetrydetection limitquantification signalgallic acidelectrochemical sensorGAgallic acid-capped AuNPsMWCNT-rGO nanocomposite electrodeecofriendly methodsMultiwalled Carbon Nanotube-Reduced Graphene Oxide Nanocomposite Electrodecreek waterGallic Acid-Capped Gold Nanoparticleselectrode surfaceelectrochemical techniquesbiogenic agentsElectrochemical DetectionHighland Creek2.57 pMCVgreen-tea-derived polyphenolDPVEISPolyphenol-capped AuNPspulse voltammetrycalibration curve
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