Monodispersed Size-Controlled Gold Nanoparticles from Electrodeposited Aminoferrocenyl Dendrimer-Templates and Their Application as Efficient Hydrogen Peroxide Electrocatalyst

Abstract

The main target of this work is the development of efficient hydrogen peroxide non-enzymatic sensors based on size-controlled gold nanoparticles from electrodeposited aminoferrocenyl dendrimer-templates. In this work we study the kinetics and electrochemistry of the modified electrodes as well as the kinetics and the analytical responses of them to both the oxidation and reduction of hydrogen peroxide via different processes related with the absence or presence of gold nanoparticles and their size. The best responses as non-enzymatic sensors were observed at 0.5 V with the largest nanoparticles, obtained from the first generation dendrimertemplate, with two linear ranges (0.001-1.2 and 1.2-4.0 mM), sensitivities 249.5 and 185.6 μA/mM cm 2 and limit of detection of 0.07 μM; and at −0.2 V with the smallest ones, obtained from the fifth generation, with three linear ranges (0.001-2.0, 2.0-4.0 and 4.0-15.0 mM), sensitivities 172.1, 888.4 and 437.0 μA/mM cm 2 respectively , and limit of detection of 0.06 μM. The non-enzymatic peroxide sensors showed an interference-free behavior at −0.2 V.

Efficient Oxidase Biosensors Based on Bioelectrocatalytic Surfaces of Electrodeposited Ferrocenyl Polycyclosiloxanes—Pt Nanoparticles

“…All the electrode surfaces prepared with these ferrocenyl macromolecules demonstrated to be excellent electro-or bioelectrocatalysts as well as enzyme supports, to develop biosensors of first, second and third generations [18][19][20]. In the last years, we have developed several composite electrode materials based on ferrocenyl dendrimers and polymers with metallic nanoparticles, with improved properties as enzyme supports and bioelectrocatalyst [20][21][22]. The Pt surfaces are not good catalysts of hydrogen peroxide; however, ferrocene compounds have proven to be excellent catalysts for these reactions, as mentioned in the introduction section.…”

Theoretical Determination of the Stabilization Time in Galvanostatic EIS Measurements: The Simplified Randles Cell

“…Electrochemical impedance spectroscopy (EIS) is a non-destructive electrochemical method, with a broad range of applications in different fields of electrochemical science and engineering, among which are, for example, energy storage [1][2], batteries [3][4][5][6][7][8], electrochemical sensors [9][10][11][12], fuel cells [13][14][15][16][17][18], electrolysers [19][20][21], corrosion and coatings [22][23][24][25], and bioelectrochemistry [26,27]. The power of this electrochemical technique arises from its ability to distinguish the different physicchemical processes undergoing at different timescales in the system [28].…”

Fabrication of Non-Enzymatic Electrochemical Hydrogen Peroxide Sensor Based on Ag NPs/Co3O4/ERGO Composite

“…3 Considering these aspects, direct electro-catalytic oxidation of hydrogen peroxide can be a desirable solution. Efforts to improve the electrochemical non-enzymatic detection of hydrogen peroxide have been documented on the basis of Au nanoparticles, 4 Ag nanoparticles, 5 Cu 2 O nanoparticles, 6 Ag-polyaniline nanotube, 7 and Pt nanoflowers. 8 Since the discovery of graphene in 2004, the single atomic layer carbon material has received considerable attention from researchers across the world due to its fascinating properties, such as high surface area, good thermal conductivity, outstanding electrical conductivity, and optical transparency.…”