A Non‐Enzymatic Hydrogen Peroxide Sensor Based on Gold Nanoparticles/Carbon Nanotube/Self‐Doped Polyaniline Hollow Spheres

Abstract

In this study, a novel non‐enzymatic hydrogen peroxide (H2O2) 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 SiO2 template, then AuNPs and CNTs were decorated by electrostatic absorption via poly(diallyldimethylammonium chloride). After the SiO2 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 H2O2 detection was evaluated by cyclic voltammetry (CV) and chronoamperometry. Using chronoamperometric method at a constant potential of −0.1 V (vs. SCE), the H2O2 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 H2O2 in disinfectant real samples.

Polyaniline–DNA based sensor for the detection of anthracycline drugs

“…Thus, PANI based sensors are applied for pH measurements [22], alone or coupled with various chemical and biochemical reactions, e.g., oxidation of organic species [24,25] or acid-base interactions in solution [26]. Various electrocatalytic materials [27,28] and redox active counter ions [29] can be additionally introduced in the PANI structure to enhance its mediation properties or specificity to an analyte conversion.…”

Water-soluble Au nanocages for enzyme-free H2O2sensor and 4-nitrophenol reduction

“…The performance of our Au nanocages H 2 O 2 sensor is also compared with those previously published enzyme or enzymefree H 2 O 2 sensors based on Au-based nanomaterials, [38][39][40][41][42][43][44][45] as shown in Table 2. Due to water-solubility and the increase of holes of NCs, the Au nanocages biosensor shows superior performance.…”

New Titanium Dioxide-Based Heterojunction Nanohybrid for Highly Selective Photoelectrochemical–Electrochemical Dual-Mode Sensors

“…The presence of PANI type π-conjugated structurals in PAPBA and Au NPs in TiO 2 (G) NW@PAPBA−Au HJNH facilitate the e − transfer to the electrode. 64,65 3.3.3. PEC Glucose Sensor Performances.…”