Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Get the Light, Beat the Heat Berkeley Lab Researchers Develop New Infrared Coating for Windows

Berkeley Lab researchers have unveiled a semiconductor nanocrystal coating material capable of controlling heat from the sun while remaining transparent. This heat passes through the film without affecting its visible transmittance, which could add a critical energy-saving dimension to “smart window” coatings.
Berkeley Lab researchers have unveiled a semiconductor nanocrystal coating material capable of controlling heat from the sun while remaining transparent. This heat passes through the film without affecting its visible transmittance, which could add a critical energy-saving dimension to “smart window” coatings.

Abstract:
Researchers with the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab) have unveiled a semiconductor nanocrystal coating material capable of controlling heat from the sun while remaining transparent. Based on electrochromic materials, which use a jolt of electric charge to tint a clear window, this breakthrough technology is the first to selectively control the amount of near infrared radiation. This radiation, which leads to heating, passes through the film without affecting its visible transmittance. Such a dynamic system could add a critical energy-saving dimension to "smart window" coatings.

Get the Light, Beat the Heat Berkeley Lab Researchers Develop New Infrared Coating for Windows

Berkeley, CA | Posted on September 9th, 2011

"To have a transparent electrochromic material that can change its transmittance in the infrared portion of sunlight is completely unprecedented," says Delia Milliron, director of the Inorganic Nanostructures Facility with Berkeley Lab's Molecular Foundry, who led this research. "What's more, the coloration efficiency of our material—a figure of merit describing the amount of current needed to make this thing go—is substantially higher than standard electrochromic materials, which means it's also very efficient."

Dynamic window coatings could translate into significant energy savings in buildings, which account for more than 40 percent of carbon emissions in the United States. According to studies conducted at the National Renewable Energy Laboratory, smart window coatings could offset the use of climate control and illumination systems by up to 49 percent for air conditioning and 51 percent for lighting.

"Traditional electrochromic windows cannot selectively control the amount of visible and near infrared light that transmits through the film. When operated, these windows can either block both regions of light or let them in simultaneously," says Guillermo Garcia, a graduate student researcher at the Foundry. "This work represents a stepping stone to the ideal smart window, which would be able to selectively choose which region of sunlight is needed to optimize the temperature inside a building."

To generate this new coating, the team developed a nanocrystal film of electrically doped indium tin oxide, a transparent semiconductor typically used as a conductive coating for flat screen TVs. By manipulating the electrons within this semiconducting film, they could tune the collective oscillations of these electrons—a phenomenon called plasmonics—across the near-infrared frequency range.

"Our ability to leverage plasmons in doped semiconductors with a very sensitive switching response in the near-infrared region also brings to mind applications in telecommunications," Milliron adds. "We've also brought this synthesis into WANDA, our nanocrystal robot, which means we will be able to provide materials for a wide variety of user projects. "

"This work expands the versatility of electrochromic devices, opening up a variety of new applications in solar and thermal control," says co-author Thomas Richardson, a staff scientist in Berkeley Lab's Environmental and Energy Technologies Division. "The innovative mechanism with high coloration efficiency offers hope for improved switching ranges and long term durability."

Garcia is the lead author and Milliron the corresponding author of a paper reporting this research in the journal Nano Letters. The paper is titled "Dynamically modulating the surface plasmon resonance of doped semiconductor nanocrystals." Co-authoring the paper with Garcia, Milliron and Richardson were Raffaella Buonsanti, Evan Runnerstrom, Rueben Mendelsberg, Anna Llordes and Andre Anders.

This work at the Molecular Foundry was supported by DOE's Office of Science.

The Molecular Foundry is one of the five DOE Nanoscale Science Research Centers (NSRCs), national user facilities for interdisciplinary research at the nanoscale, supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE's Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge and Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit science.energy.gov.

####

About Berkeley Lab
Lawrence Berkeley National Laboratory addresses the world’s most urgent scientific challenges by advancing sustainable energy, protecting human health, creating new materials, and revealing the origin and fate of the universe. Founded in 1931, Berkeley Lab’s scientific expertise has been recognized with 12 Nobel prizes. The University of California manages Berkeley Lab for the U.S. Department of Energy’s Office of Science. For more, visit www.lbl.gov.http://science.energy.gov.

For more information, please click here

Contacts:
Aditi Risbud
(510)486-4861

Copyright © Berkeley Lab

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

For more information about the Molecular Foundry visit the Website at:

Related News Press

News and information

Nanoparticles Give Antibacterial Properties to Machine-Woven Carpets August 4th, 2015

Nanoparticles used to breach mucus barrier in lungs: Proof-of-concept study conducted in mice a key step toward better treatments for lung diseases August 3rd, 2015

Promising Step Taken in Iran towards Treatment of Spinal Cord Injury August 3rd, 2015

Diagnosis of Salmonella Bacterium-Caused Food Poisoning by Biosensors August 3rd, 2015

Laboratories

Springer and Tsinghua University Press present the second Nano Research Award: Paul Alivisatos of the University of California Berkeley receives the honor for outstanding contributions in nanoscience July 30th, 2015

Sol-gel capacitor dielectric offers record-high energy storage July 30th, 2015

Meet the high-performance single-molecule diode: Major milestone in molecular electronics scored by Berkeley Lab and Columbia University team July 29th, 2015

New computer model could explain how simple molecules took first step toward life: Two Brookhaven researchers developed theoretical model to explain the origins of self-replicating molecules July 28th, 2015

Discoveries

Nanoparticles Give Antibacterial Properties to Machine-Woven Carpets August 4th, 2015

Nanoparticles used to breach mucus barrier in lungs: Proof-of-concept study conducted in mice a key step toward better treatments for lung diseases August 3rd, 2015

Promising Step Taken in Iran towards Treatment of Spinal Cord Injury August 3rd, 2015

Diagnosis of Salmonella Bacterium-Caused Food Poisoning by Biosensors August 3rd, 2015

Announcements

Nanoparticles Give Antibacterial Properties to Machine-Woven Carpets August 4th, 2015

Nanoparticles used to breach mucus barrier in lungs: Proof-of-concept study conducted in mice a key step toward better treatments for lung diseases August 3rd, 2015

Promising Step Taken in Iran towards Treatment of Spinal Cord Injury August 3rd, 2015

Diagnosis of Salmonella Bacterium-Caused Food Poisoning by Biosensors August 3rd, 2015

Home

Industrial Nanotech, Inc. Provides Update on PCAOB Audited Financials July 27th, 2015

Solar cells in the roof and nanotechnology in the walls June 16th, 2015

Industrial Nanotech, Inc. Continues Global Development Focus on Original Equipment Manufacturer (OEM) Applications: Industrial Nanotech Continues Connecting With Manufacturers Who Seek Out Their Patented Thermal Insulation and Protective Coatings June 11th, 2015

Industrial Nanotech, Inc. Article About the Evolution of Roof Coatings in Durability + Design Magazine June 9th, 2015

Industrial

Thin films offer promise for ferroelectric devices: Researchers at Tokyo Institute of Technology demystify the ferroelectric properties observed in hafnium-oxide-based thin films, revealing a potentially useful device material August 3rd, 2015

Industrial Nanotech, Inc. Provides Update on PCAOB Audited Financials July 27th, 2015

Iranian Scientists Create Best Conditions for Synthesis of Gold Nanolayers July 23rd, 2015

Nanosorbents Reduce Amount of Heavy Metals in Petrochemical Wastewater July 23rd, 2015

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