36Cl labelling and electrochemical study of chloride adsorption on a gold electrode from perchloric acid media

Kolics, A.; Thomas, A. E.; Wiȩckowski, Andrzej

doi:10.1039/ft9969203727

Cited by 51 publications

(35 citation statements)

References 40 publications

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“…Upper reaction pathway is known to be thermodynamically preferred [19][20][21] so that we can assume the faradaic oxidation of three electron transfer process in the presence of sufficient bromide ions. While there was a report of 1.9 and 1.5 electron processes for this reaction, it could have come from combination of two pathways [1,19].…”

Section: Resultsmentioning

confidence: 99%

Surface coverage and size effects on electrochemical oxidation of uniform gold nanoparticles

Han

Kim

et al. 2015

Electrochemistry Communications

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Section: Resultsmentioning

confidence: 99%

Surface coverage and size effects on electrochemical oxidation of uniform gold nanoparticles

Han

Kim

et al. 2015

Electrochemistry Communications

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“…The dissolution process of gold is also depending on the proton concentration in the solution where a low pH in the presence of chloride ions increases the dissolution [ 35 , 36 ]. During the anodic stripping, the gold will be oxidized [ 37 – 39 ], and the outcome will result in the species from the following equilibrium: …”

Section: Resultsmentioning

confidence: 99%

Counting the number of enzymes immobilized onto a nanoparticle-coated electrode

et al. 2017

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To immobilize enzymes at the surface of a nanoparticle-based electrochemical sensor is a common method to construct biosensors for non-electroactive analytes. Studying the interactions between the enzymes and nanoparticle support is of great importance in optimizing the conditions for biosensor design. This can be achieved by using a combination of analytical methods to carefully characterize the enzyme nanoparticle coating at the sensor surface while studying the optimal conditions for enzyme immobilization. From this analytical approach, it was found that controlling the enzyme coverage to a monolayer was a key factor to significantly improve the temporal resolution of biosensors. However, these characterization methods involve both tedious methodologies and working with toxic cyanide solutions. Here we introduce a new analytical method that allows direct quantification of the number of immobilized enzymes (glucose oxidase) at the surface of a gold nanoparticle coated glassy carbon electrode. This was achieved by exploiting an electrochemical stripping method for the direct quantification of the density and size of gold nanoparticles coating the electrode surface and combining this information with quantification of fluorophore-labeled enzymes bound to the sensor surface after stripping off their nanoparticle support. This method is both significantly much faster compared to previously reported methods and with the advantage that this method presented is non-toxic. Graphical abstractA new analytical method for direct quantification of the number of enzymes immobilized at the surface of gold nanoparticles covering a glassy carbon electrode using anodic stripping and fluorimetry

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“…However, while the nondoped mats have monotonically varying I–V curves measured with both electrodes, the doped mat exhibited peaks at around ±0.4 V only when measured with the Au electrodes, and a monotonically varying I–V curves when measured with the Ti electrodes. The presence of the peaks in the forward and reverse sweeps (Figure S11, Supporting Information), together with the change of the peaks' locations as a function of the distance between the electrodes (Figure S12 of the Supporting Information and text within), leads us to speculate that the observed redox peaks are due to an oxidation and reduction electrochemical process involving the hemin, and specifically the one between the chloride ion of hemin to the Au electrode (since the peaks were observed only by using the Au electrodes) . Nevertheless, it is important to note that the measured DC conductance (current at low bias) for the doped BSA mats is very similar between the Au and Ti electrodes ( Figure ; Figure S13, Supporting Information), suggesting a similar physical origin.…”

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confidence: 97%

Electron Hopping Across Hemin‐Doped Serum Albumin Mats on Centimeter‐Length Scales

et al. 2017

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Exploring long‐range electron transport across protein assemblies is a central interest in both the fundamental research of biological processes and the emerging field of bioelectronics. This work examines the use of serum‐albumin‐based freestanding mats as macroscopic electron mediators in bioelectronic devices. In particular, this study focuses on how doping the protein mat with hemin improves charge‐transport. It is demonstrated that doping can increase conductivity 40‐fold via electron hopping between adjacent hemin molecules, resulting in the highest measured conductance for a protein‐based material yet reported, and transport over centimeter length scales. The use of distance‐dependent AC impedance and DC current–voltage measurements allows the contribution from electron hopping between adjacent hemin molecules to be isolated. Because the hemin‐doped serum albumin mats have both biocompatibility and fabrication simplicity, they should be applicable to a range of bioelectronic devices of varying sizes, configurations, and applications.

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36Cl labelling and electrochemical study of chloride adsorption on a gold electrode from perchloric acid media

Cited by 51 publications

References 40 publications

Surface coverage and size effects on electrochemical oxidation of uniform gold nanoparticles

Surface coverage and size effects on electrochemical oxidation of uniform gold nanoparticles

Counting the number of enzymes immobilized onto a nanoparticle-coated electrode

Electron Hopping Across Hemin‐Doped Serum Albumin Mats on Centimeter‐Length Scales

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