polycrystalline gold

[PDF] Electrochemical Pretreatment of Polycrystalline

The pulsed-potential pretreatment procedure described in this paper can, in a reproducible way, reduce the surface roughness of mechanically polished polycrystalline gold electrodes by a factor 2. The developed procedure, in which the gold is alternately oxidized and reduced, has been optimized for use in a flow system (100 mM phosphate buffer pH 7.4).

Single-Crystal vs Polycrystalline Gold: A Non-linear ...

Standard gold in the field of plasmonics is obtained by evaporation or sputtering and therefore is polycrystalline. Yet, this gold presents numbers of drawbacks such as roughness, grains and ill-defined electronic band diagrams in addition to the lack of reproducibility from one instrument to another.

Oxygen Reduction on Au(100)-like Polycrystalline Gold ...

2016-11-13 Catalytic properties of polycrystalline gold, Au(poly), were examined for the oxygen reduction reaction in alkaline solution using the rotating disc electrode technique. On electrochemically prepared Au(poly), oxygen reduction proceeds partly through 4e-reaction pathway resembling the activity of bare Au(100) in alkaline solution.

Grain size effects in polycrystalline gold nanoparticles ...

We report a structure–property relationship in gold nanoparticles (NPs), grain-size effects, which not only allow material properties observed on different characteristic length scales to be engineered in a single NP but further enhance those properties due to the coupling among different-size grains. The grain size effects were achieved by creating polycrystalline gold NPs (pAuNPs) with two distinct grain-size

Multifractal properties of polycrystalline gold films

SPIE Digital Library Proceedings. CONFERENCE PROCEEDINGS Papers Presentations

Adsorption of nitrogen dioxide on polycrystalline gold ...

The adsorption of nitrogen dioxide (NO 2) on a polycrystalline Au surface was studied by temperature programmed desorption (TPD) and high resolution electron energy loss spectroscopy (HREELS).Three desorption states due to chemisorbed NO 2 were observed using TPD, with desorption activation energies, E d, of 11,13, and 17 kcal/mol.The desorption energies reflect the heats of adsorption of NO

The interaction of a polycrystalline gold electrode with ...

2013-2-1 The electrochemical behavior of ethanethiol was studied on polycrystalline gold electrodes in alkaline solution. With the help of cyclic voltammetry, differential pulse voltammetry and ex-situ X-ray photoelectron spectroscopy it is possible to propose a coherent reaction mechanism.

Oxygen Reduction on Au(100)-like Polycrystalline

Catalytic properties of polycrystalline gold, Au (poly), were examined for the oxygen reduction reaction in alkaline solution using the rotating disc electrode technique. On electrochemically...

HYDROXYLAMINE OXIDATION ON POLYCRYSTALLINE

A method is herein presented that allows quantitative determination of faradaic efficiencies for dinitrogen, N2, generation, during the electrochemical oxidation of hydroxylamine, NH2OH, on a polycrystalline, Au (poly), gold disk electrode in aqueous electrolytes over a wide pH range.

Polycrystalline Gold Electrodes: A Comparative Study

The influence of different surface pretreatment procedures on the electrochemical response of a polycrystalline gold electrode was evaluated. Mechanical polishing with slurry alumina (M), chemical oxidation with H 2 SO 4 /H 2 O 2 (C), electrochemical polishing (potential cycling between −0.1 V and 1.2 V vs. SCE) (E), chemical reduction with ethanol, and combinations among these treatments ...

Electrochemical study of the polycrystalline gold ...

17 小时前 Abstract The polycrystalline gold electrode has been studied in dilute LiClO4 solutions in dimethylsulphoxide using cyclic voltammetry and admittance measurements. Specific ionic adsorption is negligible in solutions more dilute than 0.1 M. The double-layer capacity depends on the potential programme applied to the electrode. It seems possible that some preferred crystallographic orientation ...

HYDROXYLAMINE OXIDATION ON POLYCRYSTALLINE

A method is herein presented that allows quantitative determination of faradaic efficiencies for dinitrogen, N2, generation, during the electrochemical oxidation of hydroxylamine, NH2OH, on a polycrystalline, Au(poly), gold disk electrode in aqueous electrolytes over a wide pH range.

Grain size effects in polycrystalline gold nanoparticles ...

We report a structure–property relationship in gold nanoparticles (NPs), grain-size effects, which not only allow material properties observed on different characteristic length scales to be engineered in a single NP but further enhance those properties due to the coupling among different-size grains. The grain size effects were achieved by creating polycrystalline gold NPs (pAuNPs) with two ...

The Differential Capacitance of Polycrystalline Gold in ...

adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A

Oxygen reduction reaction on polycrystalline gold ...

The mechanism of oxygen electroreduction on polycrystalline gold is studied in the acidic medium. Hydrogen peroxide is the main reaction product. However, two potential regions can be singled out in which the oxygen electroreduction reaction proceeds by different pathways. The first region is the potential interval close to the steady-state ...

Tailoring of a smooth polycrystalline gold surface as a ...

Tailoring of a smooth polycrystalline gold surface as a suitable anchoring site for a self-assembled monolayer. Satoshi Tsuneda, Takao Ishida, Naoki Nishida, Masahiko Hara, Hiroyuki Sasabe, Wolfgang Knoll. School of Advanced Science and Engineering; Research output: Contribution to journal › Article ›

Hydroxylamine Oxidation on Polycrystalline Gold

Herein, a method is presented that allows quantitative determination of faradaic efficiencies for dinitrogen (N 2) generation during the electrochemical oxidation of hydroxylamine (NH 2 OH), , on a polycrystalline gold Au(poly) disk electrode in aqueous electrolytes over a wide pH range.This tactic involves the use of an impinging jet electrolyte configuration incorporating a gas porous ring ...

Oxidation of the Polycrystalline Gold Foil Surface and XPS ...

—Gold oxide ﬁlms obtained on the surface of polycrystalline gold foil upon oxidation by oxygen acti- vated by a high-frequency discharge have been studied by X-ray photoelectron spectroscopy ...

Adsorption of nitrogen dioxide on polycrystalline gold ...

The adsorption of nitrogen dioxide (NO 2) on a polycrystalline Au surface was studied by temperature programmed desorption (TPD) and high resolution electron energy loss spectroscopy (HREELS).Three desorption states due to chemisorbed NO 2 were observed using TPD, with desorption activation energies, E d, of 11,13, and 17 kcal/mol.The desorption energies reflect the heats of adsorption of NO

Polycrystalline Gold Electrodes: A Comparative Study

The influence of different surface pretreatment procedures on the electrochemical response of a polycrystalline gold electrode was evaluated. Mechanical polishing with slurry alumina (M), chemical oxidation with H 2 SO 4 /H 2 O 2 (C), electrochemical polishing (potential cycling between −0.1 V and 1.2 V vs. SCE) (E), chemical reduction with ethanol, and combinations among these treatments ...

Electrochemical study of the polycrystalline gold ...

17 小时前 Abstract The polycrystalline gold electrode has been studied in dilute LiClO4 solutions in dimethylsulphoxide using cyclic voltammetry and admittance measurements. Specific ionic adsorption is negligible in solutions more dilute than 0.1 M. The double-layer capacity depends on the potential programme applied to the electrode. It seems possible that some preferred crystallographic orientation ...

Multifractal properties of polycrystalline gold films

SPIE Digital Library Proceedings. CONFERENCE PROCEEDINGS Papers

The Differential Capacitance of Polycrystalline Gold in ...

adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A

Hydroxylamine Oxidation on Polycrystalline Gold

Herein, a method is presented that allows quantitative determination of faradaic efficiencies for dinitrogen (N 2) generation during the electrochemical oxidation of hydroxylamine (NH 2 OH), , on a polycrystalline gold Au(poly) disk electrode in aqueous electrolytes over a wide pH range.This tactic involves the use of an impinging jet electrolyte configuration incorporating a gas porous ring ...

Tailoring of a smooth polycrystalline gold surface as a ...

Tailoring of a smooth polycrystalline gold surface as a suitable anchoring site for a self-assembled monolayer. Satoshi Tsuneda, Takao Ishida, Naoki Nishida, Masahiko Hara, Hiroyuki Sasabe, Wolfgang Knoll. School of Advanced Science and Engineering; Research output: Contribution to journal › Article ›

Oxygen reduction reaction on polycrystalline gold ...

The mechanism of oxygen electroreduction on polycrystalline gold is studied in the acidic medium. Hydrogen peroxide is the main reaction product. However, two potential regions can be singled out in which the oxygen electroreduction reaction proceeds by different pathways. The first region is the potential interval close to the steady-state ...

Adsorption of nitrogen dioxide on polycrystalline gold ...

The adsorption of nitrogen dioxide (NO 2) on a polycrystalline Au surface was studied by temperature programmed desorption (TPD) and high resolution electron energy loss spectroscopy (HREELS).Three desorption states due to chemisorbed NO 2 were observed using TPD, with desorption activation energies, E d, of 11,13, and 17 kcal/mol.The desorption energies reflect the heats of adsorption of NO

Adsorption of nitrogen dioxide on polycrystalline gold ...

Abstract. The adsorption of nitrogen dioxide (NO 2) on a polycrystalline Au surface was studied by temperature programmed desorption (TPD) and high resolution electron energy loss spectroscopy (HREELS).Three desorption states due to chemisorbed NO 2 were observed using TPD, with desorption activation energies,E d, of 11,13, and 17 kcal/mol.The desorption energies reflect the heats of ...

100 Watt Polycrystalline Solar Panel - SunGoldPower

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Electrochemical study of the polycrystalline gold ...

17 小时前 Abstract The polycrystalline gold electrode has been studied in dilute LiClO4 solutions in dimethylsulphoxide using cyclic voltammetry and admittance measurements. Specific ionic adsorption is negligible in solutions more dilute than 0.1 M. The double-layer capacity depends on the potential programme applied to the electrode. It seems possible that some preferred crystallographic orientation ...

[PDF] Electrochemical Pretreatment of Polycrystalline

It has been emphasized in several studies that the state of the surface, including the surface roughness, is very important for the reproducible formation of high-quality selfassembled monolayers on gold. The pulsed-potential pretreatment procedure described in this paper can, in a reproducible way, reduce the surface roughness of mechanically polished polycrystalline gold electrodes by a ...

Electrochemical behavior of polycrystalline gold

The electrochemical behavior of polycrystalline gold electrode (PAuE) modified by self-assembled monolayers (SAMs) of thiolated calix[4]arene (C4A) and undecanethiol (C11) was investigated by voltammetric methods and electrochemical impedance spectroscopy.

Oxygen reduction reaction on polycrystalline gold ...

The mechanism of oxygen electroreduction on polycrystalline gold is studied in the acidic medium. Hydrogen peroxide is the main reaction product. However, two potential regions can be singled out in which the oxygen electroreduction reaction proceeds by different pathways. The first region is the potential interval close to the steady-state ...

Study on fractal dimension of AFM images of polycrystalline ...

polycrystalline gold electrodes modified with C12 SH were measured and the results showed that the defect areas of SAM decreased and the monolayer tended to be integrate and compact along with increasing of C12 SH concentrations.Fractal analyses ...

Multifractal properties of polycrystalline gold films

SPIE Digital Library Proceedings. CONFERENCE PROCEEDINGS

A study of iodine adlayers on polycrystalline gold ...

Polycrystalline gold electrode Iodine adsorption In situ RBS Ion scattering Gold Etching abstract Iodine adsorption on a polycrystalline gold electrode was studied by in situ electrochemical Rutherford backscattering (ECRBS) using an ultrahigh vacuum (UHV)-electrochemical cell comprising of a thin-ﬁlm silicon nitride window.

Adsorption of pyridine on polycrystalline gold

2020-11-25 Adsorption of pyridine on smooth polycrystalline gold was studied by the use of the radioactive-labeling method and electrochemistry. The adsorption is reversible and, in the range of the structural uniformity of the adsorbate, characterized by the standard Gibbs energy of

Adsorption of nitrogen dioxide on polycrystalline gold ...

Abstract. The adsorption of nitrogen dioxide (NO 2) on a polycrystalline Au surface was studied by temperature programmed desorption (TPD) and high resolution electron energy loss spectroscopy (HREELS).Three desorption states due to chemisorbed NO 2 were observed using TPD, with desorption activation energies,E d, of 11,13, and 17 kcal/mol.The desorption energies reflect the heats of ...

Electrochemical Oxidation of Glucose on

The gold working electrode was prepared by melting the end of gold wire with an oxygen-gas torch flame, followed by cooling in air. A large area gold counter electrode concentrically surrounding the working electrode was used. layer indicated an increase of eight hundred folds in the oxide form anodic on the polycrystalline gold.

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