Navigation Links
'High Q' NIST nanowires may be practical oscillators
Date:11/27/2007

Nanowires grown at the National Institute of Standards and Technology (NIST) have a mechanical quality factor at least 10 times higher than reported values for other nanoscale devices such as carbon nanotubes, and comparable to that of commercial quartz crystals. Because a high Q factor indicates a capacity for stable vibrations, the nanowires might be used as oscillators in nano-electromechanical systems for future nano-sensors and communications devices.

We think the most interesting thing about these wires is the very high quality factor observed for such a small object, says NIST researcher and co-author Kris Bertness, who grew the nanowires.

NIST has developed a unique way of growing hexagonal gallium nitride (GaN) nanowires featuring low defect density and high luminescence intensity. In a new paper*, researchers at NIST and the University of Colorado at Boulder report high Q factors in wires that are 30 to 500 nanometers in diameter and 5 to 20 micrometers long, vibrating between 400,000 and 2.8 million times per second. (For comparison, the quartz crystals used in watches usually vibrate about 32,000 times a second.) The nanowires vibrated when placed on a piezoelectric device stimulated by an electrical signal. The nanowires also oscillated when excited directly by an electron beam, apparently due to the GaN materials intrinsic piezoelectric ability to covert voltage to mechanical force.

Q measures the damping of oscillations in a mechanical system as a function of frequencythe higher its Q, the longer a bell rings after being struck. Ordinarily, Q factors of mechanical resonators tend to drop as their diameters shrink. But GaN nanowires have a number of properties that may boost their Q and make them suitable as practical oscillators. They have extremely flat and smooth surfaces (irregularities have reduced performance in other oscillators.) GaN also has a resonant frequency similar to silicon (commonly used in microelec
'/>"/>

Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)  
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Dendreon Announces Publication of Phase 1 Study Highlighting Immunologic and Clinical Activity of Lapuleucel-T (Neuvenge(R)) in Advanced Breast Cancer Patients
2. Pharmatek Adds Cytotoxic and High-Potent Drug Development Capabilities to San Diego Laboratory
3. ImmuneRegen BioSciences Files 8-K that Highlights Enclosed Shareholder Letter Discussing Recent Achievements and Outlook
4. KAPE to Honor High-Performing Pennsylvania Organizations
5. SportCoatings; The North American Booster Club Association (NABCA); the Coatings Specialist Group New Booster Program Goes High Tech With Invisible Antimicrobial Defense
6. Safety Profile of TAXUS(R) Liberte(TM) Stent System Highlighted in Worlds Largest Stent Registry
7. New Survey Reveals Many Adults With High Cholesterol Fail to Take Necessary Steps to Improve Their Condition
8. Stimuvax(R) Phase II data highlight three-year survival results for patients with non-small cell lung cancer
9. Three Studies by Independent Scientists Highlighting Pressure Cycling Technology (PCT) to be Presented this Week at the British Mass Spectrometry Societys 29th Annual Meeting
10. Access Highlighted in Recent BusinessWeek Article
11. Caliper Life Sciences Introduces High Throughput RNA Assay to Improve Workflow in Gene Expression Studies
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
'High Q' NIST nanowires may be practical oscillators
(Date:1/14/2014)... SAN DIEGO and BETHESDA, ... announced today that they are joining together with ... (NIH) to help scientists develop more reliable tools ... on a faster timeline. Organovo is collaborating with ... and the National Eye Institute (NEI) to develop ...
(Date:1/14/2014)... Jan. 14, 2014  RXi Pharmaceuticals Corporation ... discovering, developing and commercializing innovative therapies addressing ... today announced that it received the Notice ... and Trademark Office on its unique self-delivering ... fibrosis. The patent covers the use of ...
(Date:1/14/2014)... and Cardiff, UK (PRWEB) January 13, 2014 ... development leader with more than 20 years in the ... optics and photonics . Hainsey will serve as the ... to have Dr. Hainsey join SPIE as our Technology ... staff,” said Dr. Andrew Brown, SPIE Senior Director for ...
(Date:1/14/2014)... 2014 Independent publisher Bitingduck Press, with ... Canada, has big ideas for 2014 in production and ... are to produce high-quality, low-cost, DRM-free ebooks and to ... , The first major development will be bookstore ... called WebBytez . WebBytez is a patent-pending way ...
Breaking Biology Technology:Organovo Announces Collaboration with National Institutes of Health 2Organovo Announces Collaboration with National Institutes of Health 3RXi Pharmaceuticals Receives US Notice of Allowance for a Key Patent Relating to its Self-Delivering Technology with sd-rxRNAs targeting CTGF, including RXI-109, for the Treatment of Fibrotic Disorders 2RXi Pharmaceuticals Receives US Notice of Allowance for a Key Patent Relating to its Self-Delivering Technology with sd-rxRNAs targeting CTGF, including RXI-109, for the Treatment of Fibrotic Disorders 3Photonics R&D Leader Bob Hainsey Joins SPIE Technical Staff 2Bitingduck Press Looks Forward to 2014 With Multimedia E-books 2
... becoming increasingly flatter - some have even become almost as ... dimensions, much to the delight of home cinema fans. Cellphones ... All of these developments owe their thanks to miniature light-emitting ... multitude of devices. However, LED technology does have a ...
... 16 Accuray Incorporated (Nasdaq: ARAY ), a global leader in ... at the Wells Fargo Securities Healthcare Conference in Boston on ... PT . , , , ... the presentation will be available online from the investor relations page of the ...
... Trans World Alloys (TWA), one of the country,s premier titanium sheet ... joined the company, as its new Chief Operating Officer. ACCORDING TO SANDY SHADROW, ... the metal business in a variety of areas." , ... Ed has attended the University of Baltimore , the ...
Cached Biology Technology:World of lights in the microcosmos 2Accuray Incorporated to Speak at Wells Fargo Securities Healthcare Conference 2Ed Brennan - New C.O.O. of Trans World Alloys 2
(Date:4/16/2014)... and soil processes are to blame for significant baseline ... a study published recently in the Journal of ... samples from all corners of Ohio showed that every ... of concern recommended by the U.S. Environmental Protection Agency. ... authors, who note that regulatory levels typically are set ...
(Date:4/16/2014)... Leo Heim and their colleagues at the University of ... of generating hydrogen using water and formaldehyde. The generation ... it comes to fuel cell technologies. The results of ... water and formaldehyde", have recently been published in the ... the new approach can be used to recycle industrial ...
(Date:4/15/2014)... Calif. UC Irvine neurobiologists have found that genetically ... into the brains of mice with the symptoms and ... in the journal Stem Cells Research and Therapy ... in two different mouse models. , Alzheimer,s disease, ... associated with accumulation of the protein amyloid-beta in the ...
Breaking Biology News(10 mins):Significant baseline levels of arsenic found in Ohio soils are due to natural processes 2Significant baseline levels of arsenic found in Ohio soils are due to natural processes 3Significant baseline levels of arsenic found in Ohio soils are due to natural processes 4UCI study finds modified stem cells offer potential pathway to treat Alzheimer's disease 2
... 2010) When researchers tested three different labeling agents ... effect the labeling agents had on stem cell phenotype, ... stem cell proliferation depending on the type of contrast ... and Spain tested USPIO (ultra small superparamagnetic iron oxide) ...
... voracious predatory crabs due to global warming could threaten ... published findings. "King crabs are ecologically important ... fisheries," said Dr Sven Thatje, an evolutionary ecologist at ... Science (SOES), which is based at the National Oceanography ...
... to spot prey, vision keeps many animals, including humans, alive. ... is it easier for us to spot movement of small ... things? The complexity of the neural network that supports vision ... and support from the National Science Foundation, Claire Wyart in ...
Cached Biology News:MRI contrast agents change stem cell proliferation 2King crab distributions limited by temperature in the Southern Ocean 2The zebrafish's neural circuit prevents it from biting off more than it can chew 2
PAb to Hu-IFN-Alpha/Beta R2 [(IFNAR2) CD118], Rabbit Serum, neutralizing Binds to but does not neutralize human interferon alpha/beta receptor...
IMAGEQUANT 100 IQTL, 1 EA. Category: ImageQuant CCD Imagers....
Request Info...
RayBio Human Cytokine Antibody Array 1.1 (4 array membranes) with Accessory, detects 20 cytokines (for lysate) Class: Antibody Array Products Product Group: Antibody Array...
Biology Products: