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A Non‐Enzymatic Hydrogen Peroxide Sensor Based on Gold Nanoparticles/Carbon Nanotube/Self‐Doped Polyaniline Hollow Spheres
Author(s) -
Chen Xiaojun,
Guo Buhua,
Hu Pingping,
Wang Yan
Publication year - 2014
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.201400080
Subject(s) - materials science , polyaniline , cyclic voltammetry , chronoamperometry , colloidal gold , fourier transform infrared spectroscopy , carbon nanotube , detection limit , analytical chemistry (journal) , electrochemical gas sensor , nanoparticle , chemical engineering , nanotechnology , nuclear chemistry , electrochemistry , electrode , polymerization , polymer , chemistry , organic chemistry , composite material , chromatography , engineering
In this study, a novel non‐enzymatic hydrogen peroxide (H 2 O 2 ) sensor was fabricated based on gold nanoparticles/carbon nanotube/self‐doped polyaniline (AuNPs/CNTs/SPAN) hollow spheres modified glassy carbon electrode (GCE). SPAN was in‐site polymerized on the surface of SiO 2 template, then AuNPs and CNTs were decorated by electrostatic absorption via poly(diallyldimethylammonium chloride). After the SiO 2 cores were removed, hollow AuNPs/CNTs/SPAN spheres were obtained and characterized by transmission electron microscopy (TEM), field‐emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FTIR). The electrochemical catalytic performance of the hollow AuNPs/CNTs/SPAN/GCE for H 2 O 2 detection was evaluated by cyclic voltammetry (CV) and chronoamperometry. Using chronoamperometric method at a constant potential of −0.1 V (vs. SCE), the H 2 O 2 sensor displays two linear ranges: one from 5 µM to 0.225 mM with a sensitivity of 499.82 µA mM −1 cm −2 ; another from 0.225 mM to 8.825 mM with a sensitivity of 152.29 µA mM −1 cm −2 . The detection limit was estimated as 0.4 µM (signal‐to‐noise ratio of 3). The hollow AuNPs/CNTs/SPAN/GCE also demonstrated excellent stability and selectivity against interferences from other electroactive species. The sensor was further applied to determine H 2 O 2 in disinfectant real samples.