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Electrochemical Pretreatment of Graphene Composite CNT Encapsulated Au Nanoparticles for H 2 O 2 Sensor
Author(s) -
Abdelwahab Adel A.
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.201600032
Subject(s) - nanocomposite , graphene , materials science , dielectric spectroscopy , amperometry , electrochemical gas sensor , transmission electron microscopy , scanning electron microscope , nanoparticle , detection limit , electrochemistry , chemical engineering , carbon nanotube , nanotechnology , composite number , nuclear chemistry , electrode , composite material , chemistry , chromatography , engineering
A new analytical strategy based on potentiostatically pretreated graphene/CNT nanocomposite encapsulated Au nanoparticles (AuNPs/PPG/CNT) for the fabrication of H 2 O 2 sensor was developed. The PPG/CNT nanocomposite was obtained through the potentiostatical of G and CNT mixture solution at an applied potential of −1.8 V, while AuNPs were immobilized on the PPG/CNT film via the produced active sites in the nanocomposite structure. The morphology and structure of the AuNPs/PPG/CNT nanocomposite were investigated by transmission electronic microscopy (TEM), UV‐visible spectroscopy, scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The nanocomposite displays intensive electrocatalytic activity towards the reduction of H 2 O 2 by enhancing the cathodic peak current and completely eliminating the interference of other species. The AuNPs/PPG/CNT sensor showed an excellent amperometric response to H 2 O 2 reduction with linear range from 1.0–150 µM and detection limit of 0.017 µM. Moreover, the sensor showed good reproducibility as well as anti‐interfering ability and long term stability. In addition, the proposed sensor was further applied for analytical determination of H 2 O 2 in human urine real samples.