Influence of the Silver Nanoparticles (AgNPs) Formation Conditions onto Titanium Dioxide (TiO2) Nanotubes Based Electrodes on Their Impedimetric Response

Abstract

This paper presents the comparison of the effects of three methods of production of silver spherical and near-spherical nanoparticles (AgNPs) on the titanium dioxide nanotubes (TNT) base: cyclic voltammetry, chronoamperometry, and sputter deposition. It also evaluates the influence of silver nanoparticles on the electrochemical properties of the developed electrodes. The novelty of this research was to fabricate regular AgNPs free of agglomerates uniformly distributed onto the TNT layer, which has not been accomplished with previous attempts. The applied methods do not require stabilizing and reducing reagents. The extensive electrochemical characteristic of AgNP/TNT was performed by open circuit potential and electrochemical impedance spectroscopy methods. For AgNPs/TNT obtained by each method, the impedance module of these electrodes was up to 50% lower when compared to TNT, which means that AgNPs enabled more efficient electron transfer due to the effective area increase. In addition, the presence of nanoparticles increases the corrosion resistance of the prepared electrodes. These substrates can be used as electrochemical sensors due to their high electrical conductivity, and also as implants due to the antibacterial properties of both the TNT and AgNPs.

Noble metal sensitized invasive porous bioelectrodes: advanced medical device for enhanced neuronal activity and chronic alcohol treatment

“…Ag-IPB has a larger surface area and a greater number of Ag nanoparticles applied to the surface than IPB and Ag-ICN; thus, both factors could have enhanced the electrical interaction with surrounding tissues/cells, as mentioned earlier. [50][51][52][53] In aggregate, we determined that Ag-IPB has the most excellent anxiety mitigation effect as induced by chronic alcoholism-related withdrawal syndromes, as demonstrated in this animal model.…”

“…The Ag-IPB group especially demonstrated signicantly increased WDR neuronal activity through the bioelectrode stimulation, which is believed to be a result of the high electrical conductivity and charge transfer properties of Ag nanoparticle. 50,51 Also, the increased WDR neuronal response following stimulation show increased action potential intensity, therefore potentially improving synaptic plasticity and the exibility of neuronal response. 52 This increase is signicantly different from the LT neuronal response, which can effectively generate more electrical signals depending on the stimulation.…”

Electrochemical Evaluation of the Compact and Nanotubular Oxide Layer Destruction under Ex Vivo Ti6Al4V ELI Transpedicular Screw Implantation

“…This initial increase seems to be related to the formation and thickening of the oxide film on the metallic surface, improving its corrosion protection ability [15]. It should be mentioned that a more positive corrosion potential results in higher corrosion resistance of the coating, confirming the possibility to reduce a toxic effect from a metal substrate by better corrosion protection of anodic layers [42]. On both forms, the oxide layer indicates higher corrosion potential compared to bare Ti6Al4V ELI, which confirms its better protection properties against corrosion fatigue, fretting corrosion, and stress corrosion.…”

“…Implantation causes a decrease in phase angle value and impedance modulus, both for compact and nanotubular Ti6Al4V. Higher phase angle values recorded for nanotubular Ti6Al4V are the result of a higher affinity to phosphate absorbing by titanium dioxide nanotubes [28,42,43]. Therefore, as can be seen in Table 4, the larger capacitive semicircle diameters and the increased phase angle all imply that a more protective passive layer was obtained on the nanotubular Ti6Al4V.…”

The Influence of the Parameters of a Gold Nanoparticle Deposition Method on Titanium Dioxide Nanotubes, Their Electrochemical Response, and Protein Adsorption

“…Protein adsorption has been demonstrated for nanotubes with a diameter ranging from 20 nm to 70 nm [6]. The electrical conductivity of TNT arrays can be significantly improved by introducing metal nanoparticles to the surface to facilitate electron transfer [1,[7][8][9]. Recently, much attention has been paid to using gold nanoparticles (AuNPs) in biosensor construction.…”