Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > New information on binding gold particles over metal oxide surfaces

This is a visualization of an atomic structure of the studied system where a negatively charged (charge -1) gold adatom is adsorbed on molybdemun-doped calcium oxide. The molebdenum dopant has an oxidation state of +3. The adsorption energy consists of ionocovalent, redox and Coulombic contributions. Yellow: gold; green: molybdenum; blue: calcium; red: oxygen.

Credit: Karoliina Honkala
This is a visualization of an atomic structure of the studied system where a negatively charged (charge -1) gold adatom is adsorbed on molybdemun-doped calcium oxide. The molebdenum dopant has an oxidation state of +3. The adsorption energy consists of ionocovalent, redox and Coulombic contributions. Yellow: gold; green: molybdenum; blue: calcium; red: oxygen.

Credit: Karoliina Honkala

Abstract:
The strong binding of gold on electronically modified calcium oxide can now be understood in detail. In a computational study, researchers Jenni Andersin, Janne Nevalaita, Karoliina Honkala and Hannu Häkkinen at the University of Jyväskylä Nanoscience Center have shown how redox chemistry entirely determines the adsorption strength of gold on the modified oxide where one metal atom is replaced with molybdenum. The study was funded by the Academy of Finland.

New information on binding gold particles over metal oxide surfaces

Finland | Posted on January 22nd, 2013

The research team applied the so-called Born-Haber cycle to analyse how different terms contribute to adsorption energy. The calculations were done at the supercomputers of the CSC - IT Center of Science by employing quantum mechanical simulation methods.

In the oxide lattice, the molybdenum atom donates two electrons into the oxide. When a gold atom adsorbs on the oxide surface, a redox reaction takes place. In this process, a third electron transferred by the dopant is gained by gold, and energy is released. By varying the dopant among several transition metal atoms, the researchers found that the amount of energy released linearly correlates with the ability of the dopant to give an electron. The trend can be used to estimate how much a guest atom stabilises gold adsorption without calculating the adsorption energy.

The research results are important for understanding catalyst-support interaction. The results fully support the experimental observation where gold nanoparticles have been seen to form flat structures over modified calcium oxide surfaces. A similar Born-Haber cycle, as applied in this study, can also be employed to analyse oxide-catalysed chemical reactions that follow the redox mechanism.

Catalysts are commonly used by industry, for instance, in the production of fuels, plastics, fertilisers and other similar products. Metal oxide surfaces are widely used as support materials for metal catalysts particles. The binding properties and shape of metal nanoparticles sensitively depend on the interaction between the support and the catalyst. By tuning this interaction, it is possible to affect the number and properties of catalytically active sites, or even create new sites. One way to modify the interaction is to dope the oxide with guest metal atoms that can donate extra electrons into a material.

####

For more information, please click here

Contacts:
Docent Karoliina Honkala
University of Jyväskylä
Department of Chemistry
Nanoscience Center

358-408-053-686

Academy of Finland Communications
Communications Specialist
Leena Vähäkylä
tel. +358 29 533 5139
firstname.lastname(at)aka.fi

Copyright © Academy of Finland

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

The results of the research team were published in December 2012 in the prestigious chemistry journal Angewandte Chemie: "The Redox Chemistry of Gold with High-Valence Doped Calcium Oxide":

Related News Press

News and information

University of Tehran Researchers Invent Non-Enzyme Sensor to Detect Blood Sugar April 23rd, 2014

Gold nanoparticles help target, quantify breast cancer gene segments in a living cell April 23rd, 2014

Study finds long-term survival of human neural stem cells transplanted into primate brain April 23rd, 2014

High-Performance, Low-Cost Ultracapacitors Built with Graphene and Carbon Nanotubes: Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles April 23rd, 2014

Chemistry

Thinnest feasible membrane produced April 17th, 2014

Targeting cancer with a triple threat: MIT chemists design nanoparticles that can deliver three cancer drugs at a time April 15th, 2014

Scientists Succeed in Simultaneous Determination of Acetaminophen, Codeine in Drug Samples April 9th, 2014

Making clothes from sugar: IBN researchers have found a green and efficient method to produce nylon from sugar April 1st, 2014

Govt.-Legislation/Regulation/Funding/Policy

Gold nanoparticles help target, quantify breast cancer gene segments in a living cell April 23rd, 2014

Atomic switcheroo explains origins of thin-film solar cell mystery April 23rd, 2014

High-Performance, Low-Cost Ultracapacitors Built with Graphene and Carbon Nanotubes: Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles April 23rd, 2014

Guo Lab Shows Potential of RNA as Heat-resistant Polymer Material for Nanoarchitectures April 23rd, 2014

Discoveries

University of Tehran Researchers Invent Non-Enzyme Sensor to Detect Blood Sugar April 23rd, 2014

Gold nanoparticles help target, quantify breast cancer gene segments in a living cell April 23rd, 2014

Atomic switcheroo explains origins of thin-film solar cell mystery April 23rd, 2014

Characterizing inkjet inks: Malvern Instruments presents new rheological research April 23rd, 2014

Announcements

Characterizing inkjet inks: Malvern Instruments presents new rheological research April 23rd, 2014

NanoSafe, Inc. announces the addition of the Labconco Protector® Glove Box to its NanoSafe Tested™ registry April 23rd, 2014

Study finds long-term survival of human neural stem cells transplanted into primate brain April 23rd, 2014

High-Performance, Low-Cost Ultracapacitors Built with Graphene and Carbon Nanotubes: Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles April 23rd, 2014

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals

Gold nanoparticles help target, quantify breast cancer gene segments in a living cell April 23rd, 2014

Economics = MC2 -- A portrait of the modern physics startup: Successful companies founded by physicists often break the Silicon Valley model, according to new American Institute of Physics report April 23rd, 2014

Study finds long-term survival of human neural stem cells transplanted into primate brain April 23rd, 2014

High-Performance, Low-Cost Ultracapacitors Built with Graphene and Carbon Nanotubes: Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles April 23rd, 2014

NanoNews-Digest
The latest news from around the world, FREE







  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE