Electrochemical Properties of Silver Nanoparticle Doped Aminosilica Nanocomposite

Choi, Yong-Jae; Luo, Tzy-Jiun M.

doi:10.4061/2011/404937

Cited by 33 publications

(20 citation statements)

References 18 publications

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“…This combined reaction at the working electrode reflects the increased redox wave signal of MPHs with specific broadness in the anodic peak. Earlier reports, such as for metalloid (silver-doped) aminosilica nanocomposites on a fluorine-doped tin oxide electrode 39 and for a glassy carbon electrode modified by silver nanoparticles, have observed a similar redox wave with specific broadness of the anodic peak in phosphate-buffered solution. 41 Although showing a shift in peak currents at different potentials, it is clear that the Au-PCB-FGO-GOx electrode in our study ensured the linear relationship of I p versus molar concentrations of glucose, with a wide linear range from 0.1 mM to 20 mM (R 0.9795 and R 0.9453 for I pc and I pa , respectively) and a sensitivity of 7.66 µA mM −1 cm −2 , suggesting that the synergistic effect from MPHs functionalized with graphene oxide provided the necessary conduction pathways and electron transfer kinetics at the active substrate.…”

Section: Au-pcb Wementioning

confidence: 88%

“…38 On the other hand, when the silversilica composite electrode is immersed in phosphate solution (without NaCl), redox reactions are associated with Ag → Ag 2 O and Ag 2 O → Ag at 0.37 V and −0.03 V. 38 Furthermore, studies have revealed that incorporation of silver nanoparticles with aminosilica film improves the electron transfer rate because of the smallest difference in the oxidation and reduction potential. [39][40][41] The electrochemical response of the Au-PCB-FGO-GOx electrode against different concentrations of glucose in phosphate-buffered solution (pH 7.4) is shown in Figure 4D. The CV of the Au-PCB-FGO-GOx electrode is observed to have a significant shift in peak redox potentials and broadness of the peak, especially at an anodic potential ( Figure 4B).…”

Section: Au-pcb Wementioning

confidence: 97%

“…37 Redox wave generation from conventional silver metal nanoparticles or silver-doped composites with silane-modified electrodes has been reported previously in the literature. 38,39 In short, the mechanism of redox reaction associated with silver-doped aminosilica in phosphate-buffered solution is demonstrated to involve oxidation and reduction potentials at 0.05 V and −0.09 V, respectively (Ag + Cl − → AgCl and AgCl → Ag). 38 On the other hand, when the silversilica composite electrode is immersed in phosphate solution (without NaCl), redox reactions are associated with Ag → Ag 2 O and Ag 2 O → Ag at 0.37 V and −0.03 V. 38 Furthermore, studies have revealed that incorporation of silver nanoparticles with aminosilica film improves the electron transfer rate because of the smallest difference in the oxidation and reduction potential.…”

Section: Au-pcb Wementioning

confidence: 99%

See 2 more Smart Citations

Functionalized graphene oxide for clinical glucose biosensing in urine and serum samples

Veerapandian¹,

Seo²,

Shin³

et al. 2012

IJN

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Abstract:A novel clinical glucose biosensor fabricated using functionalized metalloid-polymer (silver-silica coated with polyethylene glycol) hybrid nanoparticles on the surface of a graphene oxide nanosheet is reported. The cyclic voltammetric response of glucose oxidase modification on the surface of a functionalized graphene oxide electrode showed a surface-confined reaction and an effective redox potential near zero volts, with a wide linearity of 0.1-20 mM and a sensitivity of 7.66 µA mM. The functionalized graphene oxide electrode showed a better electrocatalytic response toward oxidation of H 2 O 2 and reduction of oxygen. The practical applicability of the functionalized graphene oxide electrode was demonstrated by measuring the peak current against multiple urine and serum samples from diabetic patients. This new hybrid nanoarchitecture combining a three-dimensional metalloid-polymer hybrid and two-dimensional graphene oxide provided a thin solid laminate on the electrode surface. The easy fabrication process and retention of bioactive immobilized enzymes on the functionalized graphene oxide electrode could potentially be extended to detection of other biomolecules, and have broad applications in electrochemical biosensing.

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Section: Au-pcb Wementioning

confidence: 88%

Section: Au-pcb Wementioning

confidence: 97%

Section: Au-pcb Wementioning

confidence: 99%

See 1 more Smart Citation

Functionalized graphene oxide for clinical glucose biosensing in urine and serum samples

Veerapandian¹,

Seo²,

Shin³

et al. 2012

IJN

View full text Add to dashboard Cite

show abstract

“…In this cyclic voltammogram, a quasi-reversible peak (aa ) and irreversible peak (bb ) appear for silver and gold. The peaks a (E pa = 0.2 V) and a (E pc = 0.1V) belong to the oxidation and reduction of silver nanoparticles (∆E p = 90 mV), respectively [41,43]. This sharp characteristic peak proves the existence of silver at the surface of the working electrode.…”

Section: Characterization Of the Modified Cpementioning

confidence: 90%

“…Also, both the CV of a bare CPE (red CV) and Cys-CPE (green CV) are shown in this figure, acting as background curves. Figure 2B represents the current potential behavior of a silver nanoparticles modified CPE, showing a characteristic peak for the oxidation and reduction of silver [41]. The cyclic voltammogram of an Ag/Au alloy nanoparticles modified CPE indicates, in Figure 2C, both the existence of Ag and Au at the surface.…”

Section: Characterization Of the Modified Cpementioning

confidence: 97%

Unique Properties of Core Shell Ag@Au Nanoparticles for the Aptasensing of Bacterial Cells

et al. 2016

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Abstract:In this article, it is shown that the efficiency of an electrochemical aptasensing device is influenced by the use of different nanoparticles (NPs) such as gold nanoparticles (Au), silver nanoparticles (Ag), hollow gold nanospheres (HGN), hollow silver nanospheres (HSN), silver-gold core shell (Ag@Au), gold-silver core shell (Au@Ag), and silver-gold alloy nanoparticles (Ag/Au). Among these nanomaterials, Ag@Au core shell NPs are advantageous for aptasensing applications because the core improves the physical properties and the shell provides chemical stability and biocompatibility for the immobilization of aptamers. Self-assembly of the NPs on a cysteamine film at the surface of a carbon paste electrode is followed by the immobilization of thiolated aptamers at these nanoframes. The nanostructured (Ag@Au) aptadevice for Escherichia coli as a target shows four times better performance in comparison to the response obtained at an aptamer modified planar gold electrode. A comparison with other (core shell) NPs is performed by cyclic voltammetry and differential pulse voltammetry. Also, the selectivity of the aptasensor is investigated using other kinds of bacteria. The synthesized NPs and the morphology of the modified electrode are characterized by UV-Vis absorption spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis, and electrochemical impedance spectroscopy.

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An Injectable Neural Stimulation Electrode Made from an In‐Body Curing Polymer/Metal Composite

Trevathan

Baumgart

Nicolai

et al. 2019

Adv Healthcare Materials

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Implanted neural stimulation and recording devices hold vast potential to treat a variety of neurological conditions, but the invasiveness, complexity, and cost of the implantation procedure greatly reduce access to an otherwise promising therapeutic approach. To address this need, a novel electrode that begins as an uncured, flowable prepolymer that can be injected around a neuroanatomical target to minimize surgical manipulation is developed. Referred to as the Injectrode, the electrode conforms to target structures forming an electrically conductive interface which is orders of magnitude less stiff than conventional neuromodulation electrodes. To validate the Injectrode, detailed electrochemical and microscopy characterization of its material properties is performed and the feasibility of using it to stimulate the nervous system electrically in rats and swine is validated. The silicone-metal-particle composite performs very similarly to pure wire of the same metal (silver) in all measures, including exhibiting a favorable cathodic charge storage capacity (CSC C ) and charge injection limits compared to the clinical LivaNova stimulation electrode and silver wire electrodes. By virtue of its simplicity, the Injectrode has the potential to be less invasive, more robust, and more cost-effective than traditional electrode designs, which could increase the adoption of neuromodulation therapies for existing and new indications.

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Electrochemical Properties of Silver Nanoparticle Doped Aminosilica Nanocomposite

Cited by 33 publications

References 18 publications

Functionalized graphene oxide for clinical glucose biosensing in urine and serum samples

Functionalized graphene oxide for clinical glucose biosensing in urine and serum samples

Unique Properties of Core Shell Ag@Au Nanoparticles for the Aptasensing of Bacterial Cells

An Injectable Neural Stimulation Electrode Made from an In‐Body Curing Polymer/Metal Composite

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