Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Multitasking nanotechnology

Abstract:
Confocal microscope image of a self-assembled monolayer of a polychlorotriphenyl methyl radical patterned on a quartz surface. This multifunctional molecule behaves as an electroactive switch with optical and magnetic response.

Multitasking nanotechnology

France | Posted on July 10th, 2008

Tiny electronically active chemicals can be made to form ordered layers on a surface, thanks to research supported by the European Science Foundation (ESF) through the EUROCORES programne SONS 2 (Self-Organised NanoStructures).

These nanostructured layers may one day be used to build the components of electronics devices, such as transistors and switches, for a future generation of powerful computers based on molecules rather than silicon chips.

Speaking at the European Materials Research Society (EMRS) meeting in Strasbourg, SONS II scientist Marta Mas-Torrent explained the potential of nanotechnology: "Currently, there is a great interest in employing functional molecules as building blocks for preparing devices since this will facilitate the move towards device miniaturization."

On this scale, manipulating nanoscopic components requires skill and determination but by exploiting molecular self assembly, the researchers hope to build ordered layers just a single molecule thick using microcontact printing techniques borrowed from the electronics industry.

They are now creating different arrangements of monolayers on gold, silica, and other materials.

Mas-Torrent works with Nuria Crivillers and Concepcio Rovira in Jaume Veciana's group at CSIC, in Barcelona, Spain, and is a member of the Fun-SMARTs project of ESF's SONS initiative. In her talk, which won the symposium's most original research work, sponsored by Advanced Materials, she explained the importance of multifunctional organic radicals, molecules with a spare electron, such as polychorotriphenylmethyl (PTM) radicals, which can undergo self-assembly into these organised layers.

Organic free radicals are usually highly reactive because of their spare electron. The moment they come into contact with another molecule the electron triggers an often-explosive chemical reaction. PTM radicals are different because their spare electron is shrouded by bulky chlorine atoms that hinder any explosive behaviour.

PTM radicals are often highly coloured and exhibit fluorescence in the red region of the visible spectrum, colour and fluorescence always have the potential to be exploited in optical electronics devices. Just as importantly, PTM radicals are also electroactive. This means they can be easily and reversibly reduced (or oxidized) to their positively or negatively charged (cationic or anionic) species. The different oxidised and reduced forms of PTM are different colours but neither oxidized nor reduced form is magnetic or fluorescent.

Mas-Torrent explained the relevance of this clutch of changeable properties for her self-assembled monolayers (SAMs). "The preparation of SAMs functionalised with PTM radicals on substrates results in multifunctional surfaces which are electrochemically, optically and magnetically active," she said, "We have demonstrated that these SAMs can be used as chemical and electrochemical redox switches with optical and magnetic responses."

Mas-Torrent and her colleagues did not stop with standalone SAMs. They have now added long hydrocarbon side-chains to their PTMs and found that these can also self-assemble on a graphite surface. They then studied behaviour at the interface between the graphite surface and a liquid and found that the self-assembly process is hierarchical and can give rise to complex three-dimensional ordered nanostructures that form double rows composed by a magnetic core of radicals surrounded by the side-chains.

By modifying a surface with molecules that can switch between two states - bistable compounds - the team hopes to open up the possibility of using these systems in memory devices. Surfaces functionalised with PTM radicals will allow them to fabricate multifunctional surfaces which can be interconverted between two states that exhibit different optical and magnetic properties that can be used as read-out mechanisms.

"The ultimate goal is to employ these radical building blocks to construct nanometre-scale devices addressed to specific applications," explains Mas-Torrent. By immobilizing them on specially prepared surfaces they could control and observe electrical and magnetic behaviour and in the future perhaps hook them up to input and output devices.

Key to the team's success is the collaborative possibilities opened up by the program. "Veciana's group started working on the functionalisation of surfaces after the collaboration initiated with the group of Reinhoudt from the MESA+ Research Institute in Twente within the SONS Programme," explains Mas-Torrent. "The combination of the expertise of surface functionalisation from Twente with the expertise of functional molecules of Barcelona emerged in our recent results focused on the functionalisation of different surfaces with multifunctional molecules (paramagnetic, electroactive and fluorescent) which can act as molecular switches," Mas-Torrent adds.

Mas-Torrent concedes that "much more fundamental research works need to be carried out" before applications become available. "We hope that in the future, molecular devices will play an important technological role in our society," she adds.

For more information please go to www.esf.org/sons2

or www.icmab.es/nmmo/

####

About European Science Foundation
The aim of the European Collaborative Research (EUROCORES) Scheme is to enable researchers in different European countries to develop collaboration and scientific synergy in areas where European scale and scope are required to reach the critical mass necessary for top class science in a global context. The scheme provides a flexible framework which allows national basic research funding and performing organisations to join forces to support excellent European research in and across all scientific areas. The European Science Foundation (ESF) provides scientific coordination and support for networking activities of funded scientists currently through the EC FP6 Programme, under contract no. ERAS-CT-2003-980409. Research funding is provided by participating national organisations.

For more information, please click here

Contacts:
Dr. Angela Michiko Hama

33-388-762-149

Copyright © European Science Foundation

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

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Aculon Hires New Business Development Director December 19th, 2014

Possible Futures

A novel method for identifying the body’s ‘noisiest’ networks November 19th, 2014

Researchers discern the shapes of high-order Brownian motions November 17th, 2014

VDMA Electronics Production Equipment: Growth track for 2014 and 2015 confirmed: Business climate survey shows robust industry sector November 14th, 2014

Open Materials Development Will Be Key for HP's Success in 3D Printing: HP can make a big splash in 3D printing, but it needs to shore up technology claims and avoid the temptation of the razor/razor blade business model in order to flourish November 11th, 2014

Chip Technology

Instant-start computers possible with new breakthrough December 19th, 2014

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

Pb islands in a sea of graphene magnetise the material of the future December 16th, 2014

Stanford team combines logic, memory to build a 'high-rise' chip: Today circuit cards are laid out like single-story towns; Futuristic architecture builds layers of logic and memory into skyscraper chips that would be smaller, faster, cheaper -- and taller December 15th, 2014

Self Assembly

Revealed: How bacteria drill into our cells and kill them December 2nd, 2014

Live Images from the Nano-cosmos: Researchers watch layers of football molecules grow November 5th, 2014

Outsmarting Thermodynamics in Self-assembly of Nanostructures: Berkeley Lab reports method for symmetry-breaking in feedback-driven self-assembly of optical metamaterials November 4th, 2014

NYU Researchers Break Nano Barrier to Engineer the First Protein Microfiber October 23rd, 2014

Nanoelectronics

Stacking two-dimensional materials may lower cost of semiconductor devices December 11th, 2014

Defects are perfect in laser-induced graphene: Rice University lab discovers simple way to make material for energy storage, electronics December 10th, 2014

Nanoscale resistors for quantum devices: The electrical characteristics of new thin-film chromium oxide resistors that can be tuned by controlling the oxygen content detailed in the 'Journal of Applied Physics' December 9th, 2014

'Giant' charge density disturbances discovered in nanomaterials: Juelich researchers amplify Friedel oscillations in thin metallic films November 26th, 2014

Announcements

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Aculon Hires New Business Development Director December 19th, 2014

Events/Classes

Bruker Introduces BioScope Resolve High-Resolution BioAFM System: Featuring PeakForce Tapping for Quantitative Bio-Mechanical Property Mapping December 16th, 2014

TCL Launches World’s Most Advanced TV in the World’s Largest Market: New Quantum Dot TVs with Color IQ™ Optics Deliver OLED-Quality Color at a Fraction of the Price December 15th, 2014

Stanford team combines logic, memory to build a 'high-rise' chip: Today circuit cards are laid out like single-story towns; Futuristic architecture builds layers of logic and memory into skyscraper chips that would be smaller, faster, cheaper -- and taller December 15th, 2014

PETA science consortium to present at Society for Risk Analysis meeting December 10th, 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