Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists carve nanowires out of ultrananocrystalline diamond thin films

04.11.2011
A team of scientists working at Argonne National Laboratory's (ANL) Center for Nanoscale Materials has successfully carved ultrananocrystalline diamond (UNCD) thin films into nanowires, boosting the material's functionality and providing potential improvements to the fabrication of biosensors.

The team, led by Anirudha Sumant, a materials scientist at ANL, will present their research during AVS' 58th International Symposium & Exhibition, held Oct. 30 – Nov. 4, 2011, in Nashville, Tenn.

UNCD thin films are a special form of diamond invented at ANL, and the subject of tremendous interest because of the material's highly desirable ability to alter its electrical properties when the chemical bonding between grain boundaries is modified. "It's a highly attractive carbon-based material with a wide range of applications in communications, medicine, and defense," notes Sumant.

A primary motive behind their studies, he explains, is to understand the electrical transport properties of UNCH when it's fabricated into a nanowire geometry. They also want to see how these properties can be altered by changing chemical bonding at the grain boundary and by taking advantage of increased surface-to-volume ratio at the same time.

"We've demonstrated a pathway to fabricate UNCD nanowires, with widths as small as 30 nanometers at a thickness of 40nanometers, by using a top-down fabrication approach that combines electron beam lithography and [a] reactive ion etching process," says Sumant.

Among the exceptional electrical properties of the UNCD nanowires, the researchers also discovered a resistance that is extremely sensitive to the adsorption of gas molecules at the grain boundaries. This discovery opens up new possibilities for the fabrication of advanced nanoscale sensors for specific use, according to the team.

The main advantage of UNCD over other materials, he explains, is that it provides stable functionalization, which could be very useful for fabricating a new breed of sensors.

UNCD nanowires are initially expected to find applications in the biosensor area, or in pressure or gas sensors, which could be used by the micro-electromechanical systems (MEMS) and semiconductor industries.

The AVS 58th International Symposium & Exhibition will be held Oct. 30 – Nov. 4 at the Nashville Convention Center.

Presentation MN-FrM6 "Fabrication and Characterization of Structural and Electrical Properties of Ultrananocrystalline Diamond Nanowires" is at 10 a.m. on Friday, Nov. 4.

USEFUL LINKS:

Main meeting website: http://www2.avs.org/symposium/AVS58/pages/greetings.html

Technical Program: http://www2.avs.org/symposium

Catherine Meyers | EurekAlert!
Further information:
http://www.aip.org

More articles from Physics and Astronomy:

nachricht What happens when we heat the atomic lattice of a magnet all of a sudden?
17.07.2018 | Forschungsverbund Berlin

nachricht Subaru Telescope helps pinpoint origin of ultra-high energy neutrino
16.07.2018 | National Institutes of Natural Sciences

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Microscopic trampoline may help create networks of quantum computers

17.07.2018 | Information Technology

In borophene, boundaries are no barrier

17.07.2018 | Materials Sciences

The role of Sodium for the Enhancement of Solar Cells

17.07.2018 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>