Voltammetric study of the influence of EDTA on the silver electrodeposition and morphological and structural characterization of silver films

Oliveira, G. M. de; Barbosa, Lúcio L.; Broggi, R.L.; Carlos, I.A.

doi:10.1016/j.jelechem.2004.12.033

Cited by 51 publications

(32 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A 25-mm-diameter Pt disk was then platinized to be used as a working electrode and a 76-mm-diameter Pt disk was electrodeposited with Ag layer to be used as a reference electrode. The electrodeposition of Ag layer was performed by scanning the applied potential from 0.0 to À 0.15 V (vs. Ag/AgCl) at a scan rate of 1.0 mV/s in a solution containing 0.1 M AgNO 3 , 0.2 M EDTA, 0.5 M NH 4 OH and 0.1 M NH 4 NO 3 [41]. Then the electrode was immersed in 3.0 M FeCl 3 solution for 30 min to form AgCl on the Ag layer.…”

Section: Preparation Of No Microsensormentioning

confidence: 99%

Simple Fabrication of Amperometric Nitric Oxide Microsensors Based on Electropolymerized Membrane Films

Shim

Lee

2010

Electroanalysis

View full text Add to dashboard Cite

Demand for highly sensitive, selective, and practically reliable sensors which could be easily fabricated is increasing for various applications in biological and biomedical systems. Thus, here we present a novel and simple amperometric NO microsensor based on electropolymerized polymeric films. The sensor consists of a platinized Pt disk anode (25-mm diameter) which surface is modified with electropolymerized polymer films and a Ag/AgCl wire cathode coiled around the anode. Three different electropolymerized films prepared from m-phenylenediamine (m-PD), 2,3-diaminonaphthalene (2,3-DAN), and 5-amino-1-naphthol (5A1N) are compared in terms of their permselectivity for NO over major biological interferents such as anionic nitrite, ascorbic acid, uric acid; neutral acetaminophen; and cationic dopamine. Poly-5A1N film layer among the three different polymers shows the best anti-interference characteristics for all the electroactive interferents examined. Indeed, single polymer film of electropolymerized 5A1N without any additional modification as a NO selective membrane is confirmed to be sufficient to reject anionic, neutral, as well as cationic interferents while allowing relatively high permeation of NO through it. Other analytical performance of the NO microsensor fabricated with poly-5A1N is evaluated: reliable linear dynamic range (a few tens nM to mM); sensitivity of 122.0 AE 2.5 pA/mM; detection limit of < 5.8 nM (S/N ¼ 3); response time, t 90% < 5 s, which are excellent when considering the small sensor size. Another sensor design which has both an anode (poly-5A1N modified platinized Pt) and a cathode (Ag/AgCl disk) embedded in a single sensor body is also presented.

show abstract

Section: Preparation Of No Microsensormentioning

confidence: 99%

Simple Fabrication of Amperometric Nitric Oxide Microsensors Based on Electropolymerized Membrane Films

Shim

Lee

2010

Electroanalysis

View full text Add to dashboard Cite

show abstract

“…However, it is a barrier that Ag nanoparticles often spontaneously form at the defects result in decreasing catalysis using direct electrodeposition technique. Some studies employed ethylenediaminetetraacetic acid (EDTA) or CH 3 CN to electrosynthesized dispersed silver nanoparticles by thermodynamic and kinetic influence [16,6]. The other studies took use of deactivation of organic molecular to electrodeposit of silver nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Novel Arrays Silver Nanoparticles Modified Polyrutin Coat‐Paraffin‐Impregnated Graphite Electrode for Tyrosine and Tryptophan's Oxidation

2008

View full text Add to dashboard Cite

A novel array silver nanoparticles and Rutin complex film modified paraffin-impregnated graphite electrode was proposed in this work (denoted as Ag/Rutin/WGE). The characteristics were investigated by the field emission scanning electron microscopy (FE-SEM), infrared spectra (IR), UV-visible (UV), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques. Silver ions were gradually chelated by polyrutin film at 4'-oxo-5'-OH and 5-OH-4-oxo sites accompanying adsorption, then. Silver nanoparticles were highly-dispersed electrodeposited on polyrutin film. The electrochemical behaviors of tyrosine (Tyr) and tryptophan (Trp) were studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. The Ag/Rutin/WGE electrode shows overlapping catalysis for the oxidation of Tyr and Trp. The linear response of Tyr and Trp were 0.3 -10.0 and 0.7 -70.0 mM with detection limit of 0.07 and 0.1 mM in a signal-to-noise ratio of 3.

show abstract

“…La adsorción específica reversible de las moléculas en la superficie del electrodo inhibe la difusión superficial de los adátomos. Los pares de electrones libres de los grupos oxigenados de las moléculas orgánicas interactúan fuertemente con las partículas de Pt-Ru inhibiendo el crecimiento de las cristalitas, como ha sido observado para los sistemas nano-Cu/ácido cítrico [2], nanoNi/sacarina [26], y nano-Ag/EDTA [21]. Este comportamiento puede ser relacionado con la repulsión electrostática inducida por los grupos carboxílicos desprotonados y los grupos hidroxílicos de los compuestos orgánicos adsorbidos sobre la superficie de las nanopartículas metálicas.…”

Section: Resultados Y Discusiónunclassified

Efecto de aditivos orgánicos en la deposición de catalizadores Pt-Ru

2010

View full text Add to dashboard Cite

RESUMENLa codeposición simultánea de Pt y Ru sobre materiales de carbono se llevó a cabo potenciostáticamente a -0,5 V a partir de soluciones acuosas de H 2 PtCl 6 y RuCl 3 en presencia de diferentes aditivos orgánicos: 1) etilenglicol, 2) etanol, 3) ácido fórmico, 4) citrato de sodio, 5) tartrato de sodio y 6) Na 2 H 2 EDTA. El proceso de electrodeposición fue influenciado termodinámica y cinéticamente por la presencia de los diferentes agentes estabilizantes. Los análisis SEM y AFM de los electrodos revelaron que el tamaño de las partículas y el área superficial activa de los catalizadores fueron notablemente afectados por la presencia de los agentes estabilizantes.Las diferencias en el comportamiento de los diferentes aditivos orgánicos en las soluciones de electrodeposición pueden ser asociadas con los siguientes efectos: 1) capacidad del estabilizante para acomplejar al ión metálico, 2) la adsorción específica de las moléculas orgánicas que inhiben el crecimiento de las partículas, y 3) la capacidad reductora de los compuestos orgánicos (sólo para los tres primeros aditivos).Los electrodos preparados con diferentes aditivos orgánicos presentan el siguiente orden decreciente de actividades catalíticas para la oxidación de metanol: citrato > tartrato > etanol > Na 2 H 2 EDTA > etilenglicol > ácido fórmico > sin estabilizante. Este comportamiento puede relacionarse con diferencias en el área superficial activa, tamaño de partícula y la estructura superficial del depósito metálico.Palabras claves: Electrodeposición, catalizadores bimetálicos soportados Pt-Ru, aditivos orgánicos. Effect of organic additives on the deposition of Pt-Ru catalysts ABSTRACTThe simultaneous codeposition of Pt and Ru on carbon materials was carried out potentiostatically at -0.5 V from H 2 PtCl 6 and RuCl 3 aqueous solutions in the presence of different organic additives: 1) ethylene glycol, 2) ethanol, 3) formic acid, 4) sodium citrate, 5) sodium tartrate and 6) Na 2 H 2 EDTA. The electrodeposition process was influenced thermodynamically and kinetically by the stabilizers. SEM and AFM analysis of the electrodes showed that both the particle size and the active surface area were notably affected by the presence of the stabilizing agents.The different behaviour of the stabilizing agents may be associated with the following effects: (1) the capability of the stabilizing agent to complex the metal ions, (2) the specific adsorption of organic molecules which inhibits particle growth, and (3) the reduction capability of the organic compounds.The electrodes prepared with different organic additives exhibit the following decreasing order of activities for methanol oxidation: citrate > tartrate > ethanol > Na 2 H 2 EDTA > ethylene glycol > formic acid > without stabilizer. This comportment can be related to differences in the active surface area, particle size and superficial structure of the metallic deposit.Keywords: Electrodeposition, bimetallic Pt-Ru supported catalysts, organic additives. INTRODUCCIÓNLa actividad catalítica de un sistema...

show abstract

Voltammetric study of the influence of EDTA on the silver electrodeposition and morphological and structural characterization of silver films

Cited by 51 publications

References 30 publications

Simple Fabrication of Amperometric Nitric Oxide Microsensors Based on Electropolymerized Membrane Films

Simple Fabrication of Amperometric Nitric Oxide Microsensors Based on Electropolymerized Membrane Films

Preparation of Novel Arrays Silver Nanoparticles Modified Polyrutin Coat‐Paraffin‐Impregnated Graphite Electrode for Tyrosine and Tryptophan's Oxidation

Efecto de aditivos orgánicos en la deposición de catalizadores Pt-Ru

Contact Info

Product

Resources

About