Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Changing the Channel in Nanoelectronics

Abstract:
New computer simulations may help in the design of efficient molecular wires

Changing the Channel in Nanoelectronics

Weinheim, Germany | Posted on April 19th, 2010

Two types of trends can be identified in the length-dependent conductance of molecular wires, according to Chinese scientists. In an article published online in ChemPhysChem, Jianwei Zhao and colleagues describe different length-conductivity relationships in molecular wires depending on the structures dominating the electron-transport channels. With the aid of computer simulations, the researchers were able to define a quantitative relation between the energy band gaps of different conjugated molecules and the attenuation factor—an important parameter that determines the distance over which charge can be conducted efficiently through a material. "The new results may be helpful in the design of molecular wires for nanoelectronic applications", the researchers say.

An important step in the development of electronic devices at the single-molecule level is the understanding of charge transport through individual molecular wires. In the macroscopic world, the resistance of a metallic wire increases linearly with length. But the situation is completely different for nanometer-long molecular wires, which may have diverse molecular structures leading to different electron-transport behaviors.

To address this problem, Zhao and co-workers investigated the length dependence of the conductance through several conjugated organic molecules, thereby identifying two different trends depending on the molecular structure: a single-channel conductance and a multichannel one. The researchers found that in the case of single-channel molecules such as oligothiophene (an organic semiconductor), the conductance decays rapidly with the length, following an exponential law. However, if the molecular wires have multichannels, the decay of conductance shows a different behavior. For example, the conductance of short porphyrin-based chains decays almost linearly with length, making this type of conjugated molecules particularly promising for applications as molecular wires, according to the authors.

The simulations carried out by the Chinese team have also allowed them to find a way to determine the attenuation factor—an important indicator of electron transport through a molecular wire—directly from the energy band gap of the organic compound. The researchers believe that this observation could be of use in reaching one of the ultimate goals in molecular electronics: the design of robust molecular wires with efficient electron transport over long distances.

Author: Jianwei Zhao, Nanjing University (China), www.51-stars.com.cn/english/facultylr.asp?fln=ZHAO,Jianwei

Title: The Diversity of Electron-Transport Behaviors of Molecular Junctions: Correlation with the Electron-Transport Pathway

ChemPhysChem 2010, 11, No. 9, Permalink to the article: dx.doi.org/10.1002/cssc.201000092

####

For more information, please click here

Copyright © ChemPhysChem

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 News Press

News and information

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Oxford Instruments Asylum Research Introduces the MFP-3D InfinityTM AFM Featuring Powerful New Capabilities and Stunning High Performance April 18th, 2014

Conductive Inks: booming to $2.8 billion by 2024 April 17th, 2014

Academic/Education

Director Wally Pfister joins UC Berkeley neuroengineers to discuss the science behind ‘Transcendence’ April 7th, 2014

First annual science week highlights STEM pipeline and partnerships: UB, SUNY Buffalo State and ECC team up with the City of Buffalo and its schools for April 7-11 events April 3rd, 2014

Global 450 consortium announces new general manager of internal operations: TSMC’s Cheng-Chung Chien Receives Unanimous Support, Brings History of Innovation and Efficiency to Global Consortium of Companies Driving Industry Transition to 450mm Wafer Technology March 26th, 2014

NanoTecNexus to Host "Chemistry of Wine" Fundraiser in Support of STEM Education - Collaborations Key to Success - March 20th, 2014

Chip Technology

'Exotic' material is like a switch when super thin April 18th, 2014

Scientists open door to better solar cells, superconductors and hard-drives: Research enhances understanding of materials interfaces April 14th, 2014

Obducat has launched a new generation of SINDRE® Nano Imprint production system April 11th, 2014

Scientists in Singapore develop novel ultra-fast electrical circuits using light-generated tunneling currents April 10th, 2014

Nanoelectronics

Better solar cells, better LED light and vast optical possibilities April 12th, 2014

Catching the (Invisible) Wave: UC Santa Barbara researchers create a unique semiconductor that manipulates light in the invisible infrared/terahertz range, paving the way for new and enhanced applications April 11th, 2014

Nanotech Business Review 2013-2014 April 9th, 2014

Preview of Hands-on Nanotechnology Demos at ‘Chemistry of Wine’ Fundraiser to Show Nanotech Magic April 8th, 2014

Announcements

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Oxford Instruments Asylum Research Introduces the MFP-3D InfinityTM AFM Featuring Powerful New Capabilities and Stunning High Performance April 18th, 2014

Transparent Conductive Films and Sensors Are Hot Segments in Printed Electronics: Start-ups in these fields show above-average momentum, while companies working on emissive displays such as OLED are fading, Lux Research says April 17th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE