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:7/1/2015)... ... July 01, 2015 , ... A newly launched business plan contest ... the barriers to innovation in life sciences R&D. The Pistoia Alliance President’s Startup Challenge ... of US$15,000 and a period of expert mentorship from a senior industry figure drawn ...
(Date:7/1/2015)... 2015  UCB, a multinational biopharmaceutical company, and ... in designing, transforming, and running intelligent business operations, ... of their close collaboration in driving transformation that ... services (GBS) finance organization. The Aecus ... work together effectively to embrace the innovative promise ...
(Date:6/30/2015)... CA (PRWEB) , ... June 30, 2015 , ... ... (AFM) is hosting a webinar to provide advanced scientific research into new classes ... bio science and energy. Touted as 'the wonder material of the 21st ...
(Date:6/30/2015)... ... June 30, 2015 , ... uBiome and ... insights on mechanics of fecal microbiota transplantation in C. difficile patients. , SAN ... of patients undergoing fecal microbiota transplantation (FMT) as a treatment for Clostridium difficile ...
Breaking Biology Technology:Pistoia Alliance Launches Startup Challenge 2Pistoia Alliance Launches Startup Challenge 3UCB and Genpact Receive Aecus Innovation Award for Success in Global Business Services 2UCB and Genpact Receive Aecus Innovation Award for Success in Global Business Services 3UCB and Genpact Receive Aecus Innovation Award for Success in Global Business Services 4UCB and Genpact Receive Aecus Innovation Award for Success in Global Business Services 5How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 2How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 3How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 4uBiome and OpenBiome Partner for Microbiome Study in FMT Patients 2uBiome and OpenBiome Partner for Microbiome Study in FMT Patients 3
... platform for antibody therapeutics, BASEL, Switzerland, Sept. ... it has completed the acquisition of 100% of ... Research (TSX: ARI). On,September 19th, the Ontario Superior ... by the security holders and announced in a,press ...
... at The University of Texas at San Antonio (UTSA) South ... Texas Health Science Center at San Antonio (UTHSCSA) have identified ... the early infectious process against Francisella tularensis, a ... tularemia. The findings will be released this week in a ...
... LAFAYETTE, Ind. - Fingerprints can reveal critical evidence, as ... new technology developed at Purdue University that detects trace ... in the prints. , The new technology also can ... a difficult task for current optical forensic methods. , ...
Cached Biology Technology:Roche completes acquisition of ARIUS 2UTSA/UTHSCSA publish results on bio-threat agent 2Fingerprints provide clues to more than just identity 2
(Date:6/24/2015)... 22, 2015 Research ... of the "Huawei Ascend Mate 7 Fingerprint ... their offering. Huawei,s technological choice for ... direction than Apple,s and Samsung,s one. The Ascend ... by Fingerprint Cards, a main actor in capacitive ...
(Date:6/23/2015)... GARDENS, Fla. , June 23, 2015 ... identity management and authentication solutions, today announced enhanced ... strong, multi-factor authentication solution.  The enhancements build ... use of the DigitalPersona Altus platform and ... reader compatibility. In today,s environment ...
(Date:6/17/2015)... JOSE, Calif. , June 17, 2015 /PRNewswire/ ... in human interface solutions, today announced that Xiaomi, ... adopted the Synaptics ® ClearPad ® ... of display driver integrated circuits (DDICs) for its ... Pro. By leveraging ClearPad for full in-cell display ...
Breaking Biology News(10 mins):Huawei Ascend Mate 7 Fingerprint Sensor - Reverse Costing Analysis 2Crossmatch Releases Enhanced DigitalPersona Altus Advanced Authentication Functionality 2Synaptics Touchscreen and Display Driver IC Solutions Power Xiaomi's Latest Flagship Smartphones 2Synaptics Touchscreen and Display Driver IC Solutions Power Xiaomi's Latest Flagship Smartphones 3
... the former President of the Deutsche Forschungsgemeinschaft (DFG, ... the Rising Sun, Gold Rays with Neck Ribbon ... of service to scientific cooperation between Japan and ... research. Professor Winnacker received the Order, together with ...
... synoptic view of European shipping routes can be seen for ... seven years of radar data from ESA,s Envisat satellite. ... years, but this is the first time this amount of ... produce an overview of ship traffic patterns. ,Dr ...
... issue of S cience in China Series C: Life Sciences ... field. Early 2009, eight human infection cases of H5N1 ... were reported in China. This again made the world alert ... virus. Again H5N1 is in the spotlight of the world, ...
Cached Biology News:Ernst-Ludwig Winnacker awarded the Order of the Rising Sun 2Ernst-Ludwig Winnacker awarded the Order of the Rising Sun 3ESA map reveals European shipping routes like never before 2The challenges of avian influenza virus: Mechanism, epidemiology and control 2The challenges of avian influenza virus: Mechanism, epidemiology and control 3The challenges of avian influenza virus: Mechanism, epidemiology and control 4
...
Takara's Mutan-Super Express Km Kit is designed to achieve site-directed mutagenesis in just one day. It is based on Oligonucleotide-directed Dual Amber (ODA) method, using the advantages of LA (Long...
... atoms at the 9, 10, 12, and 13 ... internal standard for the quantification of 13(S)-HODE by ... incubation of linoleic acid with plant and mammalian ... adhesion of tumor cells to the endothelium at ...
... Insect Cell Medium are recommended for protein ... combination has been selected based on rapid, ... levels observed specifically with baculoviruses derived from ... Ready-Plaque Sf9 Cells and BacVector Insect Cell ...
Biology Products: