Track topics on Twitter Track topics that are important to you
The construction and characterization of platinum and gold disk electrodes with minimum radii of 7 nm (platinum) and 500 nm (gold) is reported. The electrodes were prepared with a micropipet puller using a two step procedure and have been characterized using scanning electron microscopy, scanning electrochemical microscopy, high speed chronoamperometry, and cyclic voltammetry. The formation and growth of platinum and gold oxide layers, on the electrodes at time scales from microseconds to seconds, is reported. Significantly, the apparent microscopic area as determined by forming and subsequently reducing an oxide layer in acidic electrolyte using cyclic voltammetry depends dramatically on the scan rate. While conventional roughness factors between 1.8 and 3 are observed on average for scan rates above 5 V s(-1), the apparent roughness can exceed 30 for scan rates less than 0.5 V s(-1). Chronoamperometry, conducted on the microsecond to millisecond time scale, is used to probe the dynamics of monolayer and multilayer oxide formation as well as the reversibility of the oxide formation and removal. The latter study suggests that (at least for platinum) the growth of the oxide layer proceeds with a lower constant rate after an oxide monolayer is formed.
Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland, and School of Chemistry, University of Nottingham, Nottingham, U.K.
This article was published in the following journal.
Name: Analytical chemistry
Nanoparticle (NP) impacts on electrode surfaces has become an important method for analyzing the properties and activity of individual NPs, by either: (i) electrocatalytic reactions; or (ii) volumetri...
Two model catalytic metal/oxide systems were investigated by photoelectron spectroscopy and scanning tunneling microscopy. The mixed-oxide support was a cerium tungstate epitaxial thin layer grown in ...
The gold(I) catalyzed reaction between phenylacetylene, pyridine N-oxide and acetonitrile leading, via a putative gold-α-oxocarbene intermediate, towards an oxazole product has been investigated. A n...
The stability and reactivity of cationic gold-cerium oxide clusters, AumCenO2n+x+ (m ≤ 4, n ≤ 7, -1 ≤ x ≤ 3), were examined experimentally and computationally. These clusters were generated by...
Selective capture of thiols from a synthetic hydrogen sulfide containing mixture using supported nano-gold materials has been explored for the potential removal of thiols from sour gas production flui...
This study is an open-label, prospective pharmacokinetic study investigating two antiretroviral agents in parallel and employing an adaptive design with two stages, whereby the results obt...
This study will investigate the effectiveness of nanohydroxyapatite (nano-HAP)-containing toothpastes and cream to relieve dentin hypersensitivity, comparing it with those of a commercial ...
The purpose of this study is to demonstrate the advantage of using a gold alloy tip electrode over a platinum/iridium alloy tip electrode in ablation of the cavotricuspid isthmus in patien...
The purpose of this study is to evaluate the safety and efficacy of nano drug interventional therapy using digital subtraction angiography（DSA） for lung cancer. The nano drug is made by ...
This study valuates the safety and efficacy of treatment with 3% Diclofenac Nano-Emulsion Cream versus Placebo in subjects with osteoarthritis of the knee.
The fusion of ceramics (porcelain) to an alloy of two or more metals for use in restorative and prosthodontic dentistry. Examples of metal alloys employed include cobalt-chromium, gold-palladium, gold-platinum-palladium, and nickel-based alloys.
Platinum. A heavy, soft, whitish metal, resembling tin, atomic number 78, atomic weight 195.09, symbol Pt. (From Dorland, 28th ed) It is used in manufacturing equipment for laboratory and industrial use. It occurs as a black powder (platinum black) and as a spongy substance (spongy platinum) and may have been known in Pliny's time as "alutiae".
A chemical element having an atomic weight of 106.4, atomic number of 46, and the symbol Pd. It is a white, ductile metal resembling platinum, and following it in abundance and importance of applications. It is used in dentistry in the form of gold, silver, and copper alloys.
Unstable isotopes of gold that decay or disintegrate emitting radiation. Au 185-196, 198-201, and 203 are radioactive gold isotopes.
Inorganic compounds which contain platinum as the central atom.