Navigation Links
Carbyne morphs when stretched
Date:7/21/2014

Applying just the right amount of tension to a chain of carbon atoms can turn it from a metallic conductor to an insulator, according to Rice University scientists.

Stretching the material known as carbyne -- a hard-to-make, one-dimensional chain of carbon atoms -- by just 3 percent can begin to change its properties in ways that engineers might find useful for mechanically activated nanoscale electronics and optics.

The finding by Rice theoretical physicist Boris Yakobson and his colleagues appears in the American Chemical Society journal Nano Letters.

Until recently, carbyne has existed mostly in theory, though experimentalists have made some headway in creating small samples of the finicky material. The carbon chain would theoretically be the strongest material ever, if only someone could make it reliably.

The first-principle calculations by Yakobson and his co-authors, Rice postdoctoral researcher Vasilii Artyukhov and graduate student Mingjie Liu, show that stretching carbon chains activates the transition from conductor to insulator by widening the material's band gap. Band gaps, which free electrons must overcome to complete a circuit, give materials the semiconducting properties that make modern electronics possible.

In their previous work on carbyne, the researchers believed they saw hints of the transition, but they had to dig deeper to find that stretching would effectively turn the material into a switch.

Each carbon atom has four electrons available to form covalent bonds. In their relaxed state, the atoms in a carbyne chain would be more or less evenly spaced, with two bonds between them. But the atoms are never static, due to natural quantum uncertainty, which Yakobson said keeps them from slipping into a less-stable Peierls distortion.

"Peierls said one-dimensional metals are unstable and must become semiconductors or insulators," Yakobson said. "But it's not that simple,
'/>"/>

Contact: David Ruth
david@rice.edu
713-348-6327
Rice University
Source:Eurekalert  

Page: 1 2 3

Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Carbyne morphs when stretched
(Date:12/19/2014)... Biddeford, ME (PRWEB) December 18, 2014 ... founding director of the Center for Excellence in the ... of New England, has been selected as a member ... He is the first neuroscientist from Maine to receive ... a nonprofit organization supported entirely by the Dana Foundation. ...
(Date:12/19/2014)... With only 2 weeks left of ... Sartorius Biohit products . The product specials include Buy ... Pipette Trade-in Program, and free pipette tips. , Sartorius ... the world. They are ideal for lab technicians performing ... ,     Full volume range of 0.1 uL to ...
(Date:12/17/2014)... The Activated Carbon Manufacturing industry ... IBISWorld updated its original industry research report. , ... intensified focus on environmental policy. Over the five years ... power plants and a range of other industrial facilities ... Sarah Kahn, “a range of downstream industrial sectors rely ...
(Date:12/17/2014)... December 17, 2014 Once more, EMAAR ... a larger packaged waste water treatment plant to phase ... Economic City (KAEC). Two years ago Bioshaft successfully supplied ... Development, serving two residential towers with an occupancy of ... a quarter million gallons per day and was signed ...
Breaking Biology Technology:UNE's Ed Bilsky Named Member of Dana Alliance for Brain Initiatives 2UNE's Ed Bilsky Named Member of Dana Alliance for Brain Initiatives 3Major Pipette Distributor Pipette.com Announces Sartorius Year End Specials 2Activated Carbon Manufacturing in the US Industry Market Research Report Has Been Updated from IBISWorld 2Activated Carbon Manufacturing in the US Industry Market Research Report Has Been Updated from IBISWorld 3
... Key words: ... Imaging Beads, , ... pro-inflammatory cytokines with potent leukocyte activation and/or chemotactic activity in ... C, and CXC3) based on the number and sequential relationship of ...
... J. Chartier and H.C. Birnboim , DNA Genotek Inc., ... DNA collected with Oragene works well with TaqMan SNP Genotyping Assays. , ... detected., , ... Single-nucleotide polymorphisms (SNPs) are highly abundant, and are estimated , ...
... , , ... Research Organics, Inc.is an ISO 9001:2000 primary manufacturer and leading ... for molecular biology, , diagnostics, cell culture, ... , Founded in 1953, Research Organics pioneered manufacture ...
Cached Biology Technology:The development of a CXCR2 chemokine receptorbinding assay using the LEADseeker Multimodality Imaging System 2The development of a CXCR2 chemokine receptorbinding assay using the LEADseeker Multimodality Imaging System 3The development of a CXCR2 chemokine receptorbinding assay using the LEADseeker Multimodality Imaging System 4Oragene is compatible with TaqMan SNP genotyping 2Oragene is compatible with TaqMan SNP genotyping 3Research Organics 2Research Organics 3
(Date:12/3/2014)... , Dec. 2, 2014 As part of ... Inception Technologies is pleased to announce the release of ... customers to collect the workforce data that they need. ... have been left by existing readers. Many such devices ... connectivity and modern technology. Older models force users to ...
(Date:11/21/2014)... , Nov. 20, 2014 Strict laws against ... are piloting the North American and European automotive sector ... growing, gesture recognition systems that are intuitive and able ... in the industry. New analysis from ... Recognition Market in Europe and ...
(Date:11/18/2014)...  The Secure Identity & Biometrics Association (SIBA) ... the formation of The Airport Entry and Exit ... and Biometric Entry and Exit Solutions Framework for ... from BORDERPOL, the international non-profit organization that works ... regarding border security, traveler and migration systems. ...
Breaking Biology News(10 mins):Inception Technologies to Release New Biometric Reader 2Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 2Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 3Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 4Identity Management, Document Authentication and Biometric Companies Form "The Airport Entry and Exit Working Group", Releasing the Framework to Help Guide the Department of Homeland Security and Congress Towards Solutions 2Identity Management, Document Authentication and Biometric Companies Form "The Airport Entry and Exit Working Group", Releasing the Framework to Help Guide the Department of Homeland Security and Congress Towards Solutions 3
... Jude Children,s Research Hospital Washington University Pediatric Cancer ... half of a subtype of childhood brain tumor that ... evidence the tumors are susceptible to drugs already in ... brain tumors known as low-grade gliomas (LGGs). These slow-growing ...
... stents can keep clogged leg arteries open, preventing ... at the Society of Interventional Radiology,s 38th Annual ... disease (or PAD) is becoming increasingly prevalent due ... diabetes epidemics," said Robert A. Lookstein, M.D., FSIR, ...
... 14, 2013)Frozen balls of ice can safely kill cancerous tumors ... prospective multicenter trial of cryoablation. The results are being presented ... in New Orleans. "Cryoablation has potential as a treatment ... parts of the body and could prolong the lives of ...
Cached Biology News:Gene sequencing project finds new mutations to blame for a majority of brain tumor subtype 2Gene sequencing project finds new mutations to blame for a majority of brain tumor subtype 3Drug-coated stents prevent leg amputation 2Icy therapy spot treats cancer in the lung 2