Synthesis of polypyrrole coated manganese nanowires and their application in hydrogen peroxide detection (original) (raw)
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Enzymeless Hydrogen Peroxide Sensor Based on Mn-containing Conducting Metallopolymer
Procedia Engineering, 2012
The [Mn 4 IV O 5 (terpy) 4 (H 2 O) 2 ] 6+ complex, show great potential for electrode modification by electropolymerization using cyclic voltammetry. The voltammetric behavior both in and after electropolymerization process were also discussed, where the best condition of electropolymerization was observed for low scan rate and 50 potential cycles. A study in glass electrode for better characterization of polymer was also performed. Electrocatalytic process by metal centers of the conducting polymer in H 2 O 2 presence with an increase of anodic current at 0.85 V vs. SCE can be observed. The sensor showed great response from 9.9 x 10 -5 to 6.4 x 10 -4 mol L -1 concentration range with a detection limit of 8.8 x 10 -5 mol L -1 , where the electrocatalytic mechanism was based on oxidation of H 2 O 2 to H 2 O with consequently reduction of Mn IV to Mn III . After, the Mn III ions are oxidized electrochemically to Mn IV ions.
Journal of Solid State Electrochemistry, 2018
Thin layers formed by the arrays of the vertically oriented 2-dimensional nanocrystals of Birnessite-type manganese oxide Cu x MnO 2 •nH 2 O were synthesized for the first time by the reaction of gaseous ozone with the surface of aqueous solutions of manganese (II) acetate and copper (II) acetate salts mixture. The obtained layers were placed onto the surface of indium tin oxide (ITO)-coated glass electrodes and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), X-Ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The electrochemical performance of the layers was examined by cyclic voltammetry (CV). It was found that the synthesized structures are formed by the 2D nanocrystals with the thickness of 3-6 nm. The atomic concentration of copper x depends on the ratio of Cu(CH 3 COO) 2 and Mn(CH 3 COO) 2 solution concentrations and can be as much as 0.35. The obtained layers were tested as the electrochemical platform for nonenzymatic hydrogen peroxide sensing. It was shown that the electrode can provide an ultrasensitive H 2 O 2 determination with the limit of detection of 0.4 nМ and linear concentration range that lies in the region of nanomolar concentrations. We assume that the observed effects are due to the morphology of the synthesized layers, which ensures maximum contact of the analyte with the active sites of 2D nanocrystals of Cu x MnO 2 • nH 2 O. Comparison of the obtained analytical characteristics with the literature data indicates the good prospects of the synthesized nanomaterial for its use as a working electrode for nonenzymatic H 2 O 2 sensor. Keywords 2D crystals. δ-MnO 2. Gas-solution interface. H 2 O 2. Sensor
Journal of Chemistry, 2016
Binary catalyst nickel oxides (NiO) and manganese oxides (MnO) were prepared individually via hydrothermal route. The catalysts were characterized by scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) analysis, cyclic voltammetry (CV), and amperometry. Morphology studies revealed physical structure of nanowires nickel oxide and spherical manganese oxide with estimated length of 0.3–2.3 μm and diameter of 0.2–0.8 μm, respectively. Surface areas obtained for nickel oxide and manganese oxide were 68.9 m2 g−1and 45.2 m2 g−1, respectively. Cyclic voltammetry exhibits electrochemical responses corresponding to the electrode surfaces. The linear responses of the binary catalyst modified gold electrodes with NiO-MnO were observed in the concentration range from 31.8 μM to 0.5 mM with the detection limit of 62.5 μM.
Electrochimica Acta, 2015
In the present work, we have fabricated a spherical Mn 2 O 3-Au nanocomposite network on indium tin oxide (ITO) by means of one step co-electrodeposition technique. Upon careful investigation with microscopic and elemental analysis, we observed selective growth of Au cluster wrapped with Mn 2 O 3 spongy mat. The structure and phase of the co-electrodeposited material have been studied with X-Ray Diffraction (XRD), Electron Energy Loss Spectroscopy (EELS), X-ray Photoelectron Spectroscopy (XPS) and Raman spectroscopy. Combined electrochemical and microscopy studies were conducted to understand the formation mechanism of this spherical network. Furthermore, we have investigated the electrochemical property of this elegant nanostructure towards non-enzymatic hydrogen peroxide (H 2 O 2) sensing. We observed an enhanced sensitivity of 39.24 mA/mM/cm 2 and a low detection limit of 0.34 mM towards H 2 O 2 detection exhibited by Mn 2 O 3-Au nanocomposite. The sensitivity value is almost three orders higher than pristine Mn 2 O 3. The performance of our working electrode was also compared with some of the recent reports on enzyme based H 2 O 2 sensors. 2015 Elsevier Ltd. All rights reserved.
Sensors and Actuators B: Chemical, 2014
We report the synthesis and application of MnO 2 nanotubes/reduced graphene oxide nanocomposite (MnO 2 NTs/RGO NCs) for the detection of hydrogen peroxide. The MnO 2 NTs/RGO NCs were synthesized via a simple single-step hydrothermal process in acidic KMnO 4 solution without the use of surfactants or templates. The nanocomposites were synthesized with different percentages of RGO (1, 3 and 5%). Field emission scanning electron microscopy, transmission electron microscopy and X-ray diffraction results confirmed the growth of MnO 2 NTs on the RGO surface. Electrochemical properties of the MnO 2 NTs/RGO NCs electrode were investigated by amperometry, cyclic voltammetry and electrochemical impedance spectroscopy. The observations confirmed that the charge transfer resistance of the glassy carbon electrode (GCE) coated with MnO 2 NTs/RGO NCs was significantly decreased. The limit of detection and limit of quantification S/N = 3) of two linear segments (0.1-30 mM and 40-80 mM of H 2 O 2 ) are estimated as 1.29 M, 4.29 M and 0.82 M, 2.75 M, respectively. The reproducibility experiment results prove that the use of MnO 2 NTs/RGO NCs is feasible for the quantitative detection of H 2 O 2 in the range of 0.1-80 mmol L −1 .
The Analyst
A conducting polymer was used for the immobilization of various transition metal ion-substituted Dawson-type polyoxometalates (POMs) onto glassy carbon electrodes. Voltammetric responses of films of different thicknesses were stable within the pH domain 2-7 and reveal redox processes associated with the conducting polymer, the entrapped POMs and incorporated metal ions. The resulting POM doped polypyrrole films were found to be extremely stable towards redox switching between the various redox states associated with the incorporated POM. An amperometric sensor for hydrogen peroxide detection based upon the POM doped polymer films was investigated. The detection limits were 0.3 and 0.6 μM, for the Cu(2+)- and Fe(3+)-substituted POM-doped polypyrrole films respectively, with a linear region from 0.1 up to 2 mM H(2)O(2). Surface characterization of the polymer films was carried out using atomic force microscopy, X-ray photoelectron spectroscopy and scanning electron microscopy.
Chemosensors, 2019
Amperometric hydrogen peroxide (H2O2) and glucose biosensors based on unzipped carbon nanotubes with modified glassy carbon electrode (GCE) have been successfully fabricated via a facile electrochemical oxidative method. In this work, we investigated the feasibility of this new form of carbon nanomaterial as a substrate electrode material for fabricating sensitive platform for H2O2 and glucose sensors. For this purpose, the manganese oxide (MnO2)/unzipped single-walled carbon nanotubes (SWCNTs) film was synthesized by the cyclic voltammetry method. The developed sensing film, MnO2/unzipped SWCNTs/GCE, displayed a satisfactory analytical performance for H2O2, including a wide linear range of 2.0 × 10−6 to 5.0 × 10−3 M with a detection limit of 0.31 × 10−6 M (10.7 ppb). This film was further applied for glucose sensing with a linearity range of 0.01 to 1.2 mM with a correlation coefficient of 0.9822 in the physiological pH (7.4). This facile, fast, environmentally-friendly, and econom...
RSC Advances, 2018
The current study aims at the development of an electrochemical sensor based on a silver nanoparticlereduced graphene oxide-polyaniline (AgNPs-rGO-PANI) nanocomposite for the sensitive and selective detection of hydrogen peroxide (H 2 O 2). The nanocomposite was fabricated by simple in situ synthesis of PANI at the surface of rGO sheet which was followed by stirring with AEC biosynthesized AgNPs to form a nanocomposite. The AgNPs, GO, rGO, PANI, rGO-PANI, and AgNPs-rGO-PANI nanocomposite and their interaction were studied by UV-vis, FTIR, XRD, SEM, EDX and XPS analysis. AgNPs-rGO-PANI nanocomposite was loaded (0.5 mg cm À2) on a glassy carbon electrode (GCE) where the active surface area was maintained at 0.2 cm 2 for investigation of the electrochemical properties. It was found that AgNPs-rGO-PANI-GCE had high sensitivity towards the reduction of H 2 O 2 than AgNPs-rGO which occurred at À0.4 V vs. SCE due to the presence of PANI (AgNPs have direct electronic interaction with N atom of the PANI backbone) which enhanced the rate of transfer of electron during the electrochemical reduction of H 2 O 2. The calibration plots of H 2 O 2 electrochemical detection was established in the range of 0.01 mM to 1000 mM (R 2 ¼ 0.99) with a detection limit of 50 nM, the response time of about 5 s at a signal-to-noise ratio (S/N ¼ 3). The sensitivity was calculated as 14.7 mA mM À1 cm À2 which indicated a significant potential as a non-enzymatic H 2 O 2 sensor.
Nanostructures in Hydrogen Peroxide Sensing
Sensors
In recent years, several devices have been developed for the direct measurement of hydrogen peroxide (H2O2), a key compound in biological processes and an important chemical reagent in industrial applications. Classical enzymatic biosensors for H2O2 have been recently outclassed by electrochemical sensors that take advantage of material properties in the nano range. Electrodes with metal nanoparticles (NPs) such as Pt, Au, Pd and Ag have been widely used, often in combination with organic and inorganic molecules to improve the sensing capabilities. In this review, we present an overview of nanomaterials, molecules, polymers, and transduction methods used in the optimization of electrochemical sensors for H2O2 sensing. The different devices are compared on the basis of the sensitivity values, the limit of detection (LOD) and the linear range of application reported in the literature. The review aims to provide an overview of the advantages associated with different nanostructures to ...