Navigation Links
ORNL microscopy reveals 'atomic antenna' behavior in graphene
Date:1/31/2012

OAK RIDGE, Tenn. -- Atomic-level defects in graphene could be a path forward to smaller and faster electronic devices, according to a study led by researchers at the Department of Energy's Oak Ridge National Laboratory.

With unique properties and potential applications in areas from electronics to biodevices, graphene, which consists of a single sheet of carbon atoms, has been hailed as a rising star in the materials world. Now, an ORNL study published in Nature Nanotechnology suggests that point defects, composed of silicon atoms that replace individual carbon atoms in graphene, could aid attempts to transfer data on an atomic scale by coupling light with electrons.

"In this proof of concept experiment, we have shown that a tiny wire made up of a pair of single silicon atoms in graphene can be used to convert light into an electronic signal, transmit the signal and then convert the signal back into light," said coauthor Juan-Carlos Idrobo, who holds a joint appointment at ORNL and Vanderbilt University.

An ORNL-led team discovered this novel behavior by using aberration-corrected scanning transmission electron microscopy to image the plasmon response, or optical-like signals, of the point defects. The team's analysis found that the silicon atoms act like atomic-sized antennae, enhancing the local surface plasmon response of graphene, and creating a prototypical plasmonic device.

"The idea with plasmonic devices is that they can convert optical signals into electronic signals," Idrobo said. "So you could make really tiny wires, put light in one side of the wire, and that signal will be transformed into collective electron excitations known as plasmons. The plasmons will transmit the signal through the wire, come out the other side and be converted back to light."

Although other plasmonic devices have been demonstrated, previous research in surface plasmons has been focused primarily on metals, which has limited the scale at which the signal transfer occurs.

"When researchers use metal for plasmonic devices, they can usually only get down to 5 - 7 nanometers," said coauthor Wu Zhou. "But when you want to make things smaller, you always want to know the limit. Nobody thought we could get down to a single atom level."

In-depth analysis at the level of a single atom was made possible through the team's access to an electron microscope that is part of ORNL's Shared Research Equipment (ShaRE) User Facility.

"It is the one of only a few electron microscopes in the world that we can use to look at and study materials and obtain crystallography, chemistry, bonding, optical and plasmon properties at the atomic scale with single atom sensitivity and at low voltages," Idrobo said. "This is an ideal microscope for people who want to research carbon-based materials, such as graphene."

In addition to its microscopic observations, the ORNL team employed theoretical first-principles calculations to confirm the stability of the observed point defects. The full paper, titled "Atomically Localized Plasmon Enhancement in Monolayer Graphene," is available online here: http://www.nature.com/nnano/journal/vaop/ncurrent/full/nnano.2011.252.html.

Coauthors are ORNL's Jagjit Nanda; and Jaekwang Lee, Sokrates Pantelides and Stephen Pennycook, who are jointly affiliated with ORNL and Vanderbilt. The research was supported by DOE's Office of Science, which also sponsors ORNL's ShaRE User Facility; by the National Science Foundation; and by the McMinn Endowment at Vanderbilt University. The study used resources of the National Energy Research Scientific Computer Center, which is supported by DOE'S Office of Science.

ORNL is managed by UT-Battelle for the Department of Energy's Office of Science. DOE's Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit http://www.science.energy.gov.


'/>"/>
Contact: Morgan McCorkle
mccorkleml@ornl.gov
865-574-7308
DOE/Oak Ridge National Laboratory
Source:Eurekalert  

Related biology technology :

1. Nikon Instruments Provides Donation to Help Clemson University Start New Core Microscopy Facility
2. Nikon Instruments Introduces Exclusive VAAS Detector Imaging Method for Confocal Microscopy
3. Carbon Design Innovations, Inc. Introduces Carbon Nanotube Probe Technology for Atomic Force Microscopy, CNT-Probes Deliver New Level of AFM Imaging Performance
4. QImaging Introduces EXi Aqua™ Microscopy Camera for Bio-Imaging
5. Potential leap forward in electron microscopy
6. Nikon Corporation Acquires License From Harvard University For STORM Super Resolution Microscopy -- Will Create Innovative New N-STORM Microscope
7. A little less force: Making atomic force microscopy work for cells
8. Carl Zeiss Offers Online Promotions – Discounts on Stereomicroscopy and Converting to 3D Imaging
9. Depth charge: Using atomic force microscopy to study subsurface structures
10. Livermores DTEM earns innovation award from Microscopy Today
11. Applied Precision Installs New DeltaVision
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
ORNL microscopy reveals 'atomic antenna' behavior in graphene
(Date:4/29/2016)... ALBANY, New York , April 29, 2016 ... market report published by Transparency Market Research "Separation ... Analysis, Size, Share, Growth, Trends, and Forecast 2015 ... market was valued at US$ 10,665.5 Mn in ... CAGR of 6.8% from 2015 to 2023 to ...
(Date:4/29/2016)... ... 2016 , ... Intelligent Implant Systems announced today that the two-level components for ... the United States. These components expand the capabilities of the system and allow ... in October of 2015, the company has seen significant sales growth in 1Q 2016, ...
(Date:4/28/2016)... 28, 2016 Q BioMed ... Company,s CEO  was featured in an article he ... VCs Fear To Tread: http://www.lifescienceleader.com/doc/accelerators-enter-when-vcs-fear-to-tread-0001 ... is an essential business journal for life ... biotechs to Big Pharmas. Their content is designed ...
(Date:4/28/2016)... NY (PRWEB) , ... April 28, 2016 , ... ... has made significant investments in recruiting top industry experts, and expanding its LATAM ... which provides industry-leading tools for clients to manage their clinical trial projects. , ...
Breaking Biology Technology:
(Date:3/10/2016)... BLUE BELL, Pa. , March 10, 2016   ... U.S. Customs and Border Protection (CBP) is testing ... in San Diego to help identify ... United States . The test, designed to help determine ... outdoor, pedestrian environment, began in February and will run until ...
(Date:3/9/2016)... 2016 Nigeria . ... than 23,000 public service employees either did not exist ... salary unlawfully.    --> Nigeria ... more than 23,000 public service employees either did not ... their salary unlawfully.    --> DERMALOG, the ...
(Date:3/8/2016)... N.C. , March 8, 2016   ... sensor technology, today announced it has secured $11M ... by GII Tech, a new venture fund being ... with additional participation from existing investors TDF Ventures ... the funds to continue its triple-digit growth and ...
Breaking Biology News(10 mins):