Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Magic Trick with Gold and Glass

Abstract:
Glasses doped with gold particles of controllable size and shape deliver new materials for optoelectronic applications

Magic Trick with Gold and Glass

November 07, 2005

Even the ancient Romans were familiar with processes for coloring glass by adding gold. Initially colorless, the glass takes on a ruby-red color when heated in a controlled fashion. The source of this color is finely divided gold clusters. The light absorption depends on the concerted oscillation of the conducting electrons in all of the gold atoms in the cluster, called plasmon oscillation. Variation of the size, shape, or electrical properties of the particles’ surroundings should influence the frequency of the oscillation and thus the color of the absorbed light. This could allow for the production of materials that are suitable for use in nanophotonic components, including tiny optoelectronic circuits or optical storage devices.

How to make this work has been questionable until now, as the chemistry of gold in glass has long been a mystery. Newly published investigations have allowed K. Rademann and M. Eichelbaum in collaboration with the German Federal Institute for Materials Research and Testing to unravel this secret a little. Their first step was to produce soda–lime–silica glasses containing gold trichloride. They irradiated these glasses for five minutes with synchrotron radiation. Synchrotron radiation is extremely energetic, high-intensity light; it is produced when electrons are strongly accelerated—they nearly reach light speed within the synchrotron—and then are deflected by a magnet.

The synchrotron radiation effected a photochemical reduction of the trivalent gold ions to elemental gold, producing an even brown tone in the irradiated areas of the glasses. These were then heated to over 550 °C for a longer time (30–45 minutes) which led to the development of the red color that is characteristic of plasmon oscillation—evidence for the aggregation of gold clusters with a radius of between 3 and 6 nm, depending on the length of the treatment and the temperature. As the size of the gold particles increases, the researchers observe a red shift of the plasmon oscillation; that is, a shift to higher wavelength regions of the spectrum.

Simple heating thus allows the control of the size of gold particles in glasses that were previously activated with light; this allows for control of the absorption wavelength of the plasmon oscillation. This is a requirement for the use of these glasses as nanoscale components of optoelectronic circuits.

####


Author: Klaus Rademann, Humboldt-Universität zu Berlin (Germany),
www.chemie.hu-berlin.de/agrad/index.html

Title: On the Chemistry of Gold in Silicate Glasses: Studies on a Nonthermally Activated Growth of Gold Nanoparticles

Angewandte Chemie International Edition, doi: 10.1002/anie.200502174

Contact:
Editorial office:
angewandte@wiley-vch.de

or David Greenberg (US)
dgreenbe@wiley.com

or Julia Lampam (UK)
jlampam@wiley.co.uk

Copyright © Angewandte Chemie

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 News Press

Possible Futures

Air Force’s 30-year plan seeks 'strategic agility' August 1st, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Virus structure inspires novel understanding of onion-like carbon nanoparticles April 10th, 2014

Local girl does good March 22nd, 2014

Materials/Metamaterials

Big Results Require Big Ambitions: Three young UCSB faculty receive CAREER awards from the National Science Foundation September 18th, 2014

Wear-resistant ceramic powder maximises component lifespan in high-stress applications: Innovnano’s nanostructured 3YSZ offers improved tribological performance for manufacturing components September 18th, 2014

Next-Gen Luxury RV From Global Caravan Technologies Will Offer MagicView Roof and Windshield Using SPD-SmartGlass Technology From Research Frontiers: Recreational Vehicle Manufacturer Global Caravan Technologies (GCT) Features 28 Square Feet of MagicView™ SPD-SmartGlass September 17th, 2014

Nanoribbon film keeps glass ice-free: Rice University lab refines deicing film that allows radio frequencies to pass September 16th, 2014

Announcements

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 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