Silver Nanograins Incorporated PEDOT Modified Electrode for Electrocatalytic Sensing of Hydrogen Peroxide

Abstract

A silver nanograins (Ag NGs ) incorporated poly [3,4-ethylenedioxythiophene] (PEDOT) modified electrode was prepared by a simple electrochemical method without using any stabilizer or reducing agent. The surface morphology and thickness of the resulting modified electrode was characterized by using AFM. It was found that the size of the silver particles in the PEDOT modified electrode was smaller than that in the bare electrode. AFM studies also revealed that Ag NGs were uniformly distributed in the PEDOT modified electrode and the thickness of the film was found to be 35 nm. The Ag NGs incorporated PEDOT modified electrode exhibited good electrocatalytic activity towards the reduction of hydrogen peroxide without an enzyme or mediator immobilized in the electrode. It has shown good amperometric response to hydrogen peroxide (H 2 O 2 ) with a detection limit of 7 mM and a response time of 5 s.

Preparation and characterisation of poly(3,4-ethylenedioxythiophene) and poly(3,4-ethylenedioxythiophene)/poly(neutral red) modified carbon film electrodes, and application as sensors for hydrogen peroxide

“…In another study [36] with the polymer 5,2´:5´,2"-terthiophene-3´-carboxylic acid polymer (TCAP)), also with HRP, hydrogen peroxide reduction was measured at -0.2 V vs. Ag/AgCl and the response was more sensitive (0.48 μA cm -2 mmol -1 dm 3 ), with a wider linear range (up to 1.5 mmol dm -3 ) but the detection limit of 0.2 mmol dm -3 ) was higher than in the present work. There are very few reports in the literature concerning the determination of hydrogen peroxide without enzyme amplification at electrodes modified with conducting polymers [37] or composites containing polymer [38];…”

A Hydrogen Peroxide Sensor Based on Silver Nanoparticles Biosynthesized by Bacillus subtilis

“…The αn α was calculated to be 0.445, it meant that the rate-determining step was one electron transfer progress because the value of α ranges between 0.3 and 0.7. According to the literature, [45] the mechanism for H 2 O 2 electro-reduction may be expressed as follows:…”

Silver nanoparticles/poly(2-(N-morpholine) ethane sulfonic acid) modified electrode for electrocatalytic sensing of hydrogen peroxide

“…To the best of our knowledge, the usage of MES as a modifier for the fabrication of HP sensor had never been reported until our recent work. On the other hand, polymers films have been proven to be suitable matrices for dispersing metallic nanomaterial, and the composites of polymer and metal nanomaterial can exhibit some new properties than polymer or metal nanomaterial alone [25,[36][37][38][39]. Chen et al [25] reported a HP sensor based on silver nanograins incorporated poly(3,4-ethylenedioxythiophene) modified electrode.…”

“…On the other hand, polymers films have been proven to be suitable matrices for dispersing metallic nanomaterial, and the composites of polymer and metal nanomaterial can exhibit some new properties than polymer or metal nanomaterial alone [25,[36][37][38][39]. Chen et al [25] reported a HP sensor based on silver nanograins incorporated poly(3,4-ethylenedioxythiophene) modified electrode. Zhang et al [39] fabricated an amperometric HP sensor based on the silver nanoparticles/poly(alizarin yellow R) modified electrode.…”

“…Recent studies show that silver nanomaterial has excellent characteristic and can exhibit favorable catalytic activity for HP [19][20][21][22][23][24]. Various electrochemical HP sensors based on silver nanomaterial have been reported [25][26][27][28][29]. Ju et al [27] prepared silver-DNA hybrid nanoparticles modified electrode for detection of HP and glucose; Hu et al [28] reported a HP sensor based on myoglobin immobilized on silver nanoparticles-doped carbon nanotubes film.…”