In this paper, we investigate the hydrogen peroxide (mathrm{H}_{2}mathrm{O}_{2}) sensing characteristics of shape-tunable triangular Ag nanoplates (NPT) thin films. To fabricate the electrochemical sensor, the Ag NPT colloidal solutions, synthesized using the seed-mediated growth method, were deposited by drop casting onto commercial screen printed carbon electrodes (SPCE). The developed sensor showed good performances for the electro-reduction of mathrm{H}_{2}mathrm{O}_{2}, selected as a model analyte of reactive oxygen species (ROS) involved in the regulation of metabolic/inflammatory diseases. The electroanalytical behavior of the various Ag modified-electrodes in the presence of mathrm{H}_{2}mathrm{O}_{2} has been studied by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). LSV data show a sensor sensitivity of 0.046 mu mathrm{A}/mu mathrm{M} for mathrm{H}_{2}mathrm{O}_{2} concentrations lower than 100 mu mathrm{M}, and of 0.0085 mu mathrm{A}/mu mathrm{M} for higher concentrations up to 1 mM of mathrm{H}_{2}mathrm{O}_{2}. The electrochemical sensing response to this analyte has been correlated with the Ag NPT aspect ratio and Surface Plasmon Resonance (SPR) peak position, changing from 3 up to 18 and from 485 to 900 nm, respectively. We have observed that the plasmon-enhanced hydrogen peroxide reduction reaction leads to a kinetic improvement and the improved sensitivity is wavelength-dependent. The reported results suggest that these Ag-based nanomaterials can play a key role in the production of disposable, portable and on-site devices for the detection of mathrm{H}_{2}mathrm{O}_{2}.
H2O2 electrochemical sensing properties of size-tunable triangular Ag nanoplates
Zribi R.;Fazio E.;Neri G.;Corsaro C.;Neri F.;Neri G.
2022-01-01
Abstract
In this paper, we investigate the hydrogen peroxide (mathrm{H}_{2}mathrm{O}_{2}) sensing characteristics of shape-tunable triangular Ag nanoplates (NPT) thin films. To fabricate the electrochemical sensor, the Ag NPT colloidal solutions, synthesized using the seed-mediated growth method, were deposited by drop casting onto commercial screen printed carbon electrodes (SPCE). The developed sensor showed good performances for the electro-reduction of mathrm{H}_{2}mathrm{O}_{2}, selected as a model analyte of reactive oxygen species (ROS) involved in the regulation of metabolic/inflammatory diseases. The electroanalytical behavior of the various Ag modified-electrodes in the presence of mathrm{H}_{2}mathrm{O}_{2} has been studied by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). LSV data show a sensor sensitivity of 0.046 mu mathrm{A}/mu mathrm{M} for mathrm{H}_{2}mathrm{O}_{2} concentrations lower than 100 mu mathrm{M}, and of 0.0085 mu mathrm{A}/mu mathrm{M} for higher concentrations up to 1 mM of mathrm{H}_{2}mathrm{O}_{2}. The electrochemical sensing response to this analyte has been correlated with the Ag NPT aspect ratio and Surface Plasmon Resonance (SPR) peak position, changing from 3 up to 18 and from 485 to 900 nm, respectively. We have observed that the plasmon-enhanced hydrogen peroxide reduction reaction leads to a kinetic improvement and the improved sensitivity is wavelength-dependent. The reported results suggest that these Ag-based nanomaterials can play a key role in the production of disposable, portable and on-site devices for the detection of mathrm{H}_{2}mathrm{O}_{2}.Pubblicazioni consigliate
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