Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Graphene origami as a mechanically tunable plasmonic structure for infrared detection

Mechanically tunable light absorption wavelength with wrinkled graphene structures. A schematic illustration of the uniaxially wrinkled graphene structure (left panel) showing a reversible mechanical change of the wrinkled structure. Optical absorption spectra (right panel) for the wrinkled graphene structures with various aspect ratio of wrinkle height (h) to wavelength (λc)
CREDIT
University of Illinois College of Engineering
Mechanically tunable light absorption wavelength with wrinkled graphene structures. A schematic illustration of the uniaxially wrinkled graphene structure (left panel) showing a reversible mechanical change of the wrinkled structure. Optical absorption spectra (right panel) for the wrinkled graphene structures with various aspect ratio of wrinkle height (h) to wavelength (λc) CREDIT University of Illinois College of Engineering

Abstract:
Soldiers often need to see through smoke, fog, dust or any other airborne obscurant and detect the presence of toxins or other chemicals in the field or on the front lines. To identify those chemicals, they use infrared (IR) sensors and spectroscopy, which allow a specific color of light to shine at a particular frequency corresponding to each chemical. Identifying each chemical will require a soldier to coat the goggle with a unique filter, enabling the chemical signature to come through at a specific frequency (i.e., a specific color).

Graphene origami as a mechanically tunable plasmonic structure for infrared detection

Urbana, IL | Posted on April 25th, 2018

Researchers at the University of Illinois, however, have successfully developed a tunable infrared filter made from graphene, which would allow a solider to change the frequency of a filter simply by controlled mechanical deformation of the filter (i.e., graphene origami), and not by replacing the substance on the goggles used to filter a particular spectrum of colors.

The research is funded by the Air Force Office of Scientific Research, which is interested in sensors that are not only sensitive to different IR wavelengths, but also mechanically controllable and tunable. The results are published in a paper titled "Mechanically Reconfigurable Architectured Graphene for Tunable Plasmonic Resonances" in Light: Science & Applications.

This application is another in a series of discoveries of "wonder material" graphene by SungWoo Nam, an Assistant Professor of Mechanical Science and Engineering at the University of Illinois at Urbana-Champaign.

"Typically when you place graphene on a substrate, it is extremely transparent and absorbs only about three percent of light," Nam noted. "At certain angles, you can see it. We use this versatility to make other structures like flexible and transparent sensors out of graphene."

Because it's one-atom thin, graphene is normally used while flat. Nam's research team asked a question: what would happen if through origami (paper-folding art), you wrinkled the graphene? Could you change the properties of graphene by altering its topography?

According to Nam, scientists haven't tried this idea before with other conventional materials because they are brittle and not able to be bent without breaking. What's unique about graphene is that it is not only thin, but it is resilient, meaning it doesn't break easily when it is bent.

"Let's say we create graphene wrinkles by mechanical deformation," Nam said. "If you get a certain dimension, is there going be any changes in the way the light is going to be absorbed by the graphene? We wanted to link the dimensions of the wrinkled graphene to its optical absorption."

Nam's team discovered that indeed, wrinkled graphene absorbs light differently depending on the structure and dimensions through plasmonic resonances, thus producing different colors. In addition, unlike paper, which can't easily be flattened after folding or crumpling, graphene can be re-stretched to become flat and wrinkle free again. Not only that but the amount of light absorption can be altered by a factor of approximately 10.

"By changing the shape, you can absorb the light of a different frequency by controlling plasmonic resonance conditions," Pilgyu Kang, the first author of the paper and now an Assistant Professor at Mechanical Engineering Department at George Mason University, stated. "And by mechanically controlling the height and wavelength of the graphene wrinkles, I can excite different surface plasmons and thus absorb different frequency. At the end of the day, you get a tunable filter."

By choosing graphene as a filter for infrared goggles, the user can turn a knob to mechanically stretch and compress the graphene. That allows for a change of the light wavelength being absorbed. So as an example of its application, a solider can thus easily tune the graphene filter to a desired wavelength to match the type of chemical he/she is looking for.

"In a conventional filter, once you make the filter, you are done," Nam concluded. "No matter the size, there is one unique light wavelength. With graphene, depending on how much you stretch and release, you can communicate in different light wavelengths."

###

This work is based on an international collaboration with Dr. Kyoung-Ho Kim and Professor Hong-Gyu Park at Korea University, and is supported by the AFOSR and National Science Foundation.

####

For more information, please click here

Contacts:
SungWoo Nam

217-300-0267

Copyright © University of Illinois College of Engineering

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

RELATED JOURNAL ARTICLE:

Related News Press

News and information

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Super-light, super-insulating ceramic aerogel keeps the hottest temperatures at bay February 17th, 2019

Molecular Lego blocks: Chemical data mining boosts search for new organic semiconductors February 15th, 2019

The smallest skeletons in the marine world observed in 3D by synchrotron techniques February 15th, 2019

Graphene/ Graphite

Laser-induced graphene gets tough, with help: Rice University lab combines conductive foam with other materials for capable new composites February 12th, 2019

Scientists image conducting edges in a promising 2-D material February 8th, 2019

Large, stable pieces of graphene produced with unique edge pattern: Breakthrough in graphene research February 1st, 2019

Fluid-inspired material self-heals before your eyes: Coating for metals rapidly heals over scratches and scrapes to prevent corrosion January 30th, 2019

‘GO dough’ makes graphene easy to shape and mold: New form of graphene oxide is fun to play with — and solves manufacturing challenges January 25th, 2019

Law enforcement/Anti-Counterfeiting/Security/Loss prevention

CEA-Leti Builds Prototype of Next-Generation Mid-Infrared Optical Sensors for Portable Devices: Coin-size, On-chip Sensors that Combine High Performance and Low Power Consumption Presented in Paper at SPIE Photonics West 2019 February 5th, 2019

Govt.-Legislation/Regulation/Funding/Policy

NRL, AFRL develop direct-write quantum calligraphy in monolayer semiconductors February 15th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Sensitive sensor detects Down syndrome DNA February 14th, 2019

Laser-induced graphene gets tough, with help: Rice University lab combines conductive foam with other materials for capable new composites February 12th, 2019

Possible Futures

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Super-light, super-insulating ceramic aerogel keeps the hottest temperatures at bay February 17th, 2019

Molecular Lego blocks: Chemical data mining boosts search for new organic semiconductors February 15th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Discoveries

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Molecular Lego blocks: Chemical data mining boosts search for new organic semiconductors February 15th, 2019

The smallest skeletons in the marine world observed in 3D by synchrotron techniques February 15th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Announcements

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Super-light, super-insulating ceramic aerogel keeps the hottest temperatures at bay February 17th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Spintronics by 'straintronics': Switching superferromagnetism with electric-field induced strain February 15th, 2019

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

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Super-light, super-insulating ceramic aerogel keeps the hottest temperatures at bay February 17th, 2019

NRL, AFRL develop direct-write quantum calligraphy in monolayer semiconductors February 15th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Homeland Security

A bullet-proof heating pad November 2nd, 2018

Northwestern researchers achieve unprecedented control of polymer grids: Materials could find applications in water purification, solar energy storage, body armor June 22nd, 2018

Powering the 21st Century with Integrated Photonics: UCSB-Led Team Selected for Demonstration of a Novel Waveguide Platform Which is Transparent Throughout the MWIR and LWIR Spectral Bands June 19th, 2018

Squeezing light at the nanoscale: Ultra-confined light could detect harmful molecules June 17th, 2018

Military

NRL, AFRL develop direct-write quantum calligraphy in monolayer semiconductors February 15th, 2019

Laser-induced graphene gets tough, with help: Rice University lab combines conductive foam with other materials for capable new composites February 12th, 2019

Rice U. lab adds porous envelope to aluminum plasmonics: Scientists marry gas-trapping framework to light-powered nanocatalysts February 10th, 2019

Disruptive by Design: Nano Now February 1st, 2019

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



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project