Navigation Links
3-dimensional view of 1-dimensional nanostructures
Date:1/6/2012

Just 100 nanometers in diameter, nanowires are often considered one-dimensional. But researchers at Northwestern University have recently reported that individual gallium nitride nanowires show strong piezoelectricity a type of charge-generation caused by mechanical stress in three dimensions.

The findings, led by Horacio Espinosa, James N. and Nancy J. Farley Professor in Manufacturing and Entrepreneurship at the McCormick School of Engineering and Applied Science, were published online Dec. 22 in Nano Letters.

Gallium nitride (GaN) is among the most technologically relevant semiconducting materials and is ubiquitous today in optoelectronic elements such as blue lasers (hence the blue-ray disc) and light-emitting-diodes (LEDs). More recently, nanogenerators based on GaN nanowires were demonstrated capable of converting mechanical energy (such as biomechanical motion) to electrical energy.

"Although nanowires are one-dimensional nanostructures, some properties such as piezoelectricity, the linear form of electro-mechanical coupling are three-dimensional in nature," Espinosa said. "We thought these nanowires should show piezoelectricity in 3D, and aimed at obtaining all the piezoelectric constants for individual nanowires, similar to the bulk material."

The findings revealed that individual GaN nanowires as small as 60 nanometers show piezoelectric behavior in 3D up to six times of their bulk counterpart. Since the generated charge scales linearly with piezoelectric constants, this finding implies that nanowires are up to six times more efficient in converting mechanical to electrical energy.

To obtain the measurements, researchers applied an electric field in different directions in single nanowire and measured small displacements, often in pico-meter (10-12 m) range. The group devised a method based on scanning probe microscopy leveraging high-precision displacement measurement capability of an a
'/>"/>

Contact: Megan Fellman
fellman@northwestern.edu
847-491-3115
Northwestern University
Source:Eurekalert  

Page: 1 2

Related biology technology :

1. Heated AFM tip allows direct fabrication of ferroelectric nanostructures on plastic
2. Intricate, curving 3-D nanostructures created using capillary action forces
3. High-speed filter uses electrified nanostructures to purify water at low cost
4. New security and medical sensor devices made possible by metallic nanostructures
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
3-dimensional view of 1-dimensional nanostructures
(Date:7/24/2014)... -- Research and Markets has announced the ... report to their offering.  ... in vitro growth of plant or animal cells for ... production. Cell culture is a crucial step in tissue ... culture consumables are necessary for the in vitro production ...
(Date:7/24/2014)... 24, 2014 Three companies from the ... Livestrong’s Big C Competition. Out of 700 competition entrants, ... to the semi-final round. In this round twenty teams ... program, complete with mentoring from thought-leaders and medical entrepreneurs ... of the angelMD commitment to the Livestrong vision around ...
(Date:7/24/2014)... 2014 The first part of the ... First in Human Studies” will cover comprehensive clinical support ... , With increasing R&D costs and declining industry success ... maximize the knowledge collected in early Phase I/IIa study ... in late stage development. , Next, the presenters will ...
(Date:7/24/2014)... CA (PRWEB) July 24, 2014 ... reporting of molecular diagnostic test results. It also ... necessary for the validation and reporting of high ... Molecular diagnostics is a rapidly growing area of ... disease, genetic predisposition, cancer, and companion diagnostics in ...
Breaking Biology Technology:Global Cell Culture Market 2014-2018: Key Vendors are Becton, Dickinson and Co, EMD, GE Healthcare, Lonza Group, Sigma Aldrich and Thermo Fisher Scientific 23 angelMD Startups Make Livestrong Big C Semi-finals 2Best Practices for Optimizing Dose Escalation in First in Human Studies, New Webinar August 6th Hosted by Xtalks 2New DNA-barcode Patent Virtually Eliminates False Test Results and Sample Mix-up 2
... professor of materials science and engineering at Virginia ... the Friedrich Wilhelm Bessel Research Award presented by ... is for scholars, internationally renowned in their field, ... ago and who are expected to continue to ...
... Investor Uprising ( www.investoruprising.com ) has released "A Guide ... best biotech Exchange Traded Funds (ETFs) and mutual funds, ... Website. (Logo: http://photos.prnewswire.com/prnh/20110411/NY80781LOGO-a) "A ... market, identifying the leading biotech mutual funds and ETFs. ...
... 2011 Aaron Mitchell, managing principal at global management consulting ... consultants of 2011 by Consulting Magazine. Mitchell was recognized for ... over several years and during a major, recent product launch. ... the top consultants," said Mitchell, who has more than 10 ...
Cached Biology Technology:Virginia Tech's Kathy Lu receives Humboldt Foundation research award 2Investor Uprising Publishes Free Biotech Investment Report 2Investor Uprising Publishes Free Biotech Investment Report 3Managing Principal at ZS Associates Named One of Consulting Magazine's Top 25 Consultants of 2011 2
(Date:7/24/2014)... is available in German . ... Norway and they are a common sight on the roads ... cars topped the list of new vehicle registrations for the ... in Germany, where electric vehicles claim only a small portion ... roads in Germany, only a mere 8000 are electric powered. ...
(Date:7/24/2014)... a virus living inside your gut that has gone ... by researchers at San Diego State University has found ... to a newly described virus, named crAssphage, which infects ... Bacteroidetes . This phylum of bacteria is thought ... diseases. The research appears today in Nature Communications ...
(Date:7/23/2014)... The U.S. Environmental Protection Agency (EPA) today ... the University of Massachusetts Amherst School of Public ... three-year, $700,000 Science to Achieve Results (STAR) grant ... by Native subsistence hunters in subarctic North America ... exposure and to provide culturally-relevant recommendations for mitigation. ...
Breaking Biology News(10 mins):Nano-supercapacitors for electric cars 2Nano-supercapacitors for electric cars 3Newly discovered gut virus lives in half the world's population 2Newly discovered gut virus lives in half the world's population 3Studying impacts of indoor air pollution on tribal communities 2Studying impacts of indoor air pollution on tribal communities 3
... French . Quebec City, October 27, ... of pancreatic cells and could increase the risk of developing ... Faculty of Pharmacy. Details of this discovery were recently published ... In vitro tests conducted by Professor Frdric Picard and ...
... & Self-Service Will... -- REDWOOD SHORES, Calif., Oct. 27 ... ... if (typeof(lpUnit)==,undefined,) var lpUnit=,PRN,; --> ... { var s = ,; var first_result; // Results are keyed by longUrl, so we need to grab the ...
... global studies of future species shifts and losses foresees ... but offers new hope that it could be slowed ... experts Henrique Miguel Pereira and Paul Leadley, the 23-member ... DIVERSITAS, UNEP-WCMC and the secretariat of the CBD compared ...
Cached Biology News:Glucosamine causes the death of pancreatic cells 2CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 2CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 3CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 4CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 5CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 6CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 7CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 8CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 9CIC Announces Upcoming Webinar: Insurance Consumer Expectations; Customer Experience & Self-Service Will Hit New Highs in 2011! The Role eSignatures Will Play in Meeting that Demand 10Continuing biodiversity loss predicted but could be slowed 2Continuing biodiversity loss predicted but could be slowed 3