A Novel Enzyme-Free Hydrogen Peroxide Sensor Based on Electrode Modified with Gold Nanoparticles-Overoxidized Polydopamine Composites

Li, Sujuan

doi:10.20964/110402887

Cited by 9 publications

(3 citation statements)

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“…First, eMLP was electrochemically coated on the gold electrodes in water as a deposition solvent without extra supporting electrolytes. Other studies generally use phosphate buffer , or Tris buffer − with slightly acidic or basic conditions for dip coating or electrochemical deposition of insulating MLP. In a basic phosphate buffer, the presence of HPO 4 –2 could form hydrogen bonds with the hydroxyl group of MLP, which may inhibit covalent coupling among the dopamine monomers.…”

Section: Resultsmentioning

confidence: 99%

Highly Conductive Melanin-like Polymer Composites for Nonenzymatic Glucose Biosensors with a Wide Detection Range

Ozlu

Shim

2022

ACS Appl. Polym. Mater.

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Melanin is a natural biopolymer with a conjugated backbone that supposedly provides conductive pathways. However, few studies have synthesized electrically conductive melanin-like polymers (eMLPs) so far. In this study, highly electrically conductive melanin-like polymers (eMLPs) were electrochemically synthesized with tunable morphologies. After a bare gold electrode was coated with eMLP, the electrochemical performances were dramatically improved by a 2-order of magnitude decrease in impedance and up to a 60-fold increase in charge storage capacity. The morphology of the eMLP could be modulated by the ratios of carboxylic acid-bearing poly(L-3,4-dihydroxyphenylalanine) nanoparticles (PLDA NPs) to dopamine without compromising the electrochemical properties. Unlike conventionally insulating polydopamine, eMLP was demonstrated in glucose detection to be a nonenzymatic biosensor with high sensitivity (752.5 μA mM −1 cm −2 ), a low limit of detection (23 μM), a wide linear range up to 70 mM, and physiological selectivity. This eMLP composite with superior electrochemical performances can be utilized in a wide range of bioelectronics applications from in situ biosensors to implantable bionic interfaces.

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Section: Resultsmentioning

confidence: 99%

Highly Conductive Melanin-like Polymer Composites for Nonenzymatic Glucose Biosensors with a Wide Detection Range

Ozlu

Shim

2022

ACS Appl. Polym. Mater.

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“…Also the LOD and LOQ increase from 0.68 mM and 2.29 mM, respectively for AgNP/GO-GE to 0.28 mM and 0.96 mM, respectively for AgNC/GO-GE, thus increasing sensing capabilities by a factor greater than two. This suggests that the introduction of planar silver nanostructures improve the electrochemical properties of ultrasensitive sensor materials [30] and in this case, outperforms spherically shaped nanoparticles. Several performance metrics for similar Ag-based electrochemical sensors reported in the literature indicate smaller values of sensitivity, for example, Viswanathan, P et al reports a sensitivity of 34 µA mM −1 for an electrode based on silver nanoparticles synthetized in the presence of polymers [31], also Noor, A. et al indicates a sensitivity of 0.12 µA mM −1 at a modified glassy carbon electrode with silver nanocomposites [4], this comparison reveals promising and favorable results for AgNP/GO-GE and AgNC/GO-GE.…”

Section: Electrocatalytic Reduction Of H2o2mentioning

confidence: 95%

Photochemical growth of silver nanoplates on graphene oxide for the electrochemical sensing of hydrogen peroxide

Pilicita

Briceño

Suppan

et al. 2022

Preprint

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In this work, we growth silver nanoplates on graphene oxide (GO) as an electrochemical sensor for detecting hydrogen peroxide (H2O2). Silver nanoplates on GO were obtained by the in-situ photoreduction method at 540 nm excitation wavelength. The nanocomposites were characterized using UV-Vis spectroscopy, Scanning electron microscopy (SEM), Atomic force microscopy (AFM), Transmission electron microscopy (TEM), Raman spectroscopy, and the electrochemical properties were measured by cyclic voltammetry (CV). Our results reveal the transformation of quasi-spherical silver nanoparticles from 12 nm to planar faces of 25 nm on GO. The preeminent detection range for H2O2 determination was 0.4 mM to 3 mM with a detection limit of 0.28 mM and sensitivity of 444.51 µA mM−1 cm−2. The results reveal that a synergistic effect between silver nanoplates on GO enhances the electrochemical properties for the determination of H2O2.

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“…Here, the authors achieved a long-term stability, with 85% of the initial sensor response after one month of storage at room temperature. Following the idea of using polymers for loading and stabilizing nanostructures, Li et al [ 59 ] developed an enzyme free sensor based on a gold electrode modified with Au NPs and overoxidized polydopamine composites.…”

Section: Materials Used For Electrocatalytic Hydrogen Peroxide Senmentioning

confidence: 99%

Nanostructures in Hydrogen Peroxide Sensing

Trujillo

Barraza

Zamora

et al. 2021

Sensors

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In recent years, several devices have been developed for the direct measurement of hydrogen peroxide (), a key compound in biological processes and an important chemical reagent in industrial applications. Classical enzymatic biosensors for 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 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 assess which one best suits a target application.

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A Novel Enzyme-Free Hydrogen Peroxide Sensor Based on Electrode Modified with Gold Nanoparticles-Overoxidized Polydopamine Composites

Cited by 9 publications

References 0 publications

Highly Conductive Melanin-like Polymer Composites for Nonenzymatic Glucose Biosensors with a Wide Detection Range

Highly Conductive Melanin-like Polymer Composites for Nonenzymatic Glucose Biosensors with a Wide Detection Range

Photochemical growth of silver nanoplates on graphene oxide for the electrochemical sensing of hydrogen peroxide

Nanostructures in Hydrogen Peroxide Sensing

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