Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Graphene nanoribbons as electronic switches: A new theoretical study shows the conductivity conditions under which graphene nanoribbons can become switches in externally controlled electronic devices

Graphenes conductivity is the object of many theoretical and experimental studies Dmitry Knorre/Fotolia
Graphenes conductivity is the object of many theoretical and experimental studies

Dmitry Knorre/Fotolia

Abstract:
One of graphene's most sought-after properties is its high conductivity. Argentinian and Brazilian physicists have now successfully calculated the conditions of the transport, or conductance mechanisms, in graphene nanoribbons. The results, recently published in a paper in EPJ B, yield a clearer theoretical understanding of conductivity in graphene samples of finite size, which have applications in externally controlled electronic devices.

Graphene nanoribbons as electronic switches: A new theoretical study shows the conductivity conditions under which graphene nanoribbons can become switches in externally controlled electronic devices

Heidelberg, Germany | Posted on April 8th, 2014

When the conductivity is high, the electrons, carriers of electrical current, are minimally hampered during transport through graphene. One aspect of conductivity is the electron transport gap, which is the minimal energy required for electric current to pass through the material. The electron transport gap is an important factor for applications in electronic devices, because when the transport gap is controllable, it can be used as a switch in transistors - the main components of any electronic device.
To study the electron transport gap, scientists prefer to use graphene nanoribbons, which can have variable crystallographic structures at their edges. In this EPJ B paper, the authors found that the transport gap is larger when the ribbon is narrower in width and that it is independent of the crystallographic orientation of the ribbon's edges.
The team found that the transport gap is inversely proportional to the ribbon's width and is independent of the crystallographic orientation of the ribbon's edges. Also, the conductance varies with the applied external voltage. These findings confirm previous theoretical and experimental results.
In addition, the authors focused on direct current conductivity, which is expected to jump through well-defined sharp steps, and referred to as quantisation. However, the authors' theoretical models present a somewhat different picture: the steps are not equally spaced and are not clearly separate but more blurred. By comparison, the conductance quantisation in graphene nanoribbons was previously observed experimentally in several works.
Unfortunately, none of the experiments can yet resolve the form of the steps. Further, the precision of existing measurements cannot yet clearly discriminate between different predictions for quantisation. More precise theoretical models are now required for a better understanding of the experimental behaviour of nanoribbons.

####

For more information, please click here

Contacts:
Saskia Rohmer

49-622-148-78414

Copyright © Springer

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Reference: C. G. Beneventano, I. V. Fialkovsky, E. M. Santangelo and D. V. Vassilevich (2014), Charge density and conductivity of disordered Berry-Mondragon graphene nanoribbons, European Physical Journal B, DOI 10.1140/epjb/e2014-40990-x:

Related News Press

News and information

Harris & Harris Group Notes Announcements by Its Portfolio Companies During the Third Quarter of 2016 September 30th, 2016

INVECAS to Enable ASIC Designs for Tomorrows Intelligent Systems on GLOBALFOUNDRIES' FDX Technology: INVECAS to Collaborate with GLOBALFOUNDRIES to Provide IP and End-to-End ASIC Design Services on 22FDX and 12FDX Technologies September 30th, 2016

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Innovation in Nanotechnology is Focus of Symposium: Annual event brings international experts to Northwestern Oct. 6 September 29th, 2016

Cambrios at CEATEC - Japan 2016 September 29th, 2016

Graphene/ Graphite

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Chip Technology

INVECAS to Enable ASIC Designs for Tomorrows Intelligent Systems on GLOBALFOUNDRIES' FDX Technology: INVECAS to Collaborate with GLOBALFOUNDRIES to Provide IP and End-to-End ASIC Design Services on 22FDX and 12FDX Technologies September 30th, 2016

Picosun patents ALD nanolaminate to prevent electronics from overheating September 28th, 2016

Researchers at the Catalan Institute of Nanoscience and Nanotechnology show that bending semiconductors generates electricity September 26th, 2016

Mexican scientist in the Netherlands seeks to achieve data transmission ... speed of light September 20th, 2016

Nanoelectronics

Mexican scientist in the Netherlands seeks to achieve data transmission ... speed of light September 20th, 2016

GLOBALFOUNDRIES to Deliver Industrys Leading-Performance Offering of 7nm FinFET Technology: Company extends its leading-edge roadmap for products demanding the ultimate processing power September 15th, 2016

Semiconducting inorganic double helix: New flexible semiconductor for electronics, solar technology and photo catalysis September 15th, 2016

A versatile method to pattern functionalized nanowires: A team of researchers from Hokkaido University has developed a versatile method to pattern the structure of 'nanowires,' providing a new tool for the development of novel nanodevices September 9th, 2016

Discoveries

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Nanosensors could help determine tumors ability to remodel tissue: Measuring enzyme levels could help doctors select appropriate treatments September 29th, 2016

Fighting cancer with sticky nanoparticles September 27th, 2016

Gold nanoparticles conjugated quercetin inhibits epithelial-mesenchymal transition, angiogenesis and invasiveness via EGFR/VEGFR-2 mediated pathway in breast cancer September 27th, 2016

Announcements

Harris & Harris Group Notes Announcements by Its Portfolio Companies During the Third Quarter of 2016 September 30th, 2016

INVECAS to Enable ASIC Designs for Tomorrows Intelligent Systems on GLOBALFOUNDRIES' FDX Technology: INVECAS to Collaborate with GLOBALFOUNDRIES to Provide IP and End-to-End ASIC Design Services on 22FDX and 12FDX Technologies September 30th, 2016

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Innovation in Nanotechnology is Focus of Symposium: Annual event brings international experts to Northwestern Oct. 6 September 29th, 2016

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Nanosensors could help determine tumors ability to remodel tissue: Measuring enzyme levels could help doctors select appropriate treatments September 29th, 2016

Fighting cancer with sticky nanoparticles September 27th, 2016

Gold nanoparticles conjugated quercetin inhibits epithelial-mesenchymal transition, angiogenesis and invasiveness via EGFR/VEGFR-2 mediated pathway in breast cancer September 27th, 2016

Crystalline Fault Lines Provide Pathway for Solar Cell Current: New tomographic AFM imaging technique reveals that microstructural defects, generally thought to be detrimental, actually improve conductivity in cadmium telluride solar cells September 26th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic