Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Nanoparticle assembly: Bridging spheres

Fig. 1: Micrograph view through the glass substrate showing the formation of a liquid bridge network during the evaporation of solvent. Reproduced from Ref. 1 © 2009 The American Chemical Society
Fig. 1: Micrograph view through the glass substrate showing the formation of a liquid bridge network during the evaporation of solvent. Reproduced from Ref. 1 © 2009 The American Chemical Society

Abstract:
A lithographic approach based on evaporating solutions makes conducting networks of microwires for electronics

Nanoparticle assembly: Bridging spheres

Singapore | Posted on February 3rd, 2010

A process to rival traditional lithography approaches, and which can be used to create microwire networks, is now a step closer to real applicability in future electronics. By optimizing the processing conditions for ‘evaporative lithography', a research team from Singapore and Australia has maximized the connectivity and conductivity of the microwire networks that conduct electricity1.

"Evaporative lithography could offer a cost-effective and environmentally friendly bench-top alternative to existing lithographic techniques such as photolithography, soft lithography and nanoimprinting," says team member Ivan Vakarelski from the A*STAR Institute of Chemical and Engineering Sciences, Singapore. He explains that the team is aiming primarily at creating large conducting microwire networks that, when deposited onto a glass substrate, could be used as transparent electrodes. These could be an alternative to the industry standard of indium tin oxide coatings, which would help circumvent the high cost and limited supply of indium.

Vakarelski and his co-workers created the microwire networks from solutions of gold nanoparticles of 20 nanometers diameter. As in their earlier work2, they first established a template of much larger latex microparticles on a substrate, then deposited solutions of the nanoparticles on top and allowed them to dry gradually. Surface tension then drove the solution into lines that formed ‘bridges' between neighboring latex particles (Fig. 1). Once the pattern was completely dry and the researchers removed the latex particles, the gold nanoparticles from the solution remained in a network of microwires.

The network pattern depends on the original positioning of the latex particles in the template, allowing different microwire designs to be easily realized. Vakarelski and his co-workers found that the networks can be improved for maximum conductivity and connectivity by adding a surfactant and treating the latex spheres with heat and oxygen plasma. They believe that these factors act to stabilize the latex spheres and the liquid bridges during drying to encourage full microwire networks to form.

Vakarelski is optimistic that the technique will progress to a level such that it will be used in manufacturing processes. He explains that this can be achieved by adapting the template production and expanding the size capacity to the scale of silicon wafers used in electronics.

The team's approach potentially has broader applications beyond electronics. "We can create special functional networks using semiconducting particles," Vakarelski says. Other examples include magnetic particles, carbon nanotubes, DNA, proteins and other macromolecules and even mixtures of these to create networks and nodes with desired properties.

The A*STAR affiliated authors in this highlight are from the Institute of Chemical and Engineering Sciences and the Institute of Materials Research and Engineering.

Reference

1. Vakarelski, I.U., Kwek, J.W., Tang, X.S., O'Shea, S.J. & Chan, D.Y.C. Particulate templates and ordered liquid bridge networks in evaporative lithography. Langmuir 25, 13311-13314 (2009).
2. Vakarelski, I.U., Chan, D.Y.C., Nonoguchi, T., Shinto, H. & Higashitani, K. Assembly of gold nanoparticles into microwire networks induced by drying liquid bridges. Physical Review Letters 102, 058303 (2009).

####

About A*STAR
A*STAR Research is an online and print publication highlighting some of the best research and technological developments at the research institutes of Singapore’s Agency for Science, Technology and Research (A*STAR). Established in 2002, A*STAR has thrived as a global research organization with a principal mission of fostering world-class scientific research and talent for a vibrant knowledge-based Singapore. A*STAR currently oversees 14 research institutes as well as 7 consortia and centers located in the Biopolis and Fusionopolis complexes and the vicinity, and supports extramural research in collaboration with universities, hospital research centers and other local and international partners. The various A*STAR institutes are involved in research in a wide range of scientific fields, coordinated and funded by Singapore’s Biomedical Research Council (BMRC) and Science and Engineering Research Council (SERC).

For more information, please click here

Copyright © A*STAR

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

Measuring the Smallest Magnets July 28th, 2014

WITec to host the 11th Confocal Raman Imaging Symposium from September 29th - October 1st in Ulm, Germany July 28th, 2014

FEI adds Phase Plate Technology and Titan Halo TEM to its Structural Biology Product Portfolio: New solutions provide the high-quality imaging and contrast necessary to analyze the 3D structure of molecules and molecular complexes July 28th, 2014

Production of Toxic Gas Sensor Based on Nanorods July 28th, 2014

Possible Futures

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Virus structure inspires novel understanding of onion-like carbon nanoparticles April 10th, 2014

Local girl does good March 22nd, 2014

Surface Characteristics Influence Cellular Growth on Semiconductor Material March 12th, 2014

Chip Technology

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Nanometrics Announces Upcoming Investor Events July 22nd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

Nanoelectronics

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

3-D nanostructure could benefit nanoelectronics, gas storage: Rice U. researchers predict functional advantages of 3-D boron nitride July 15th, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Announcements

Measuring the Smallest Magnets July 28th, 2014

WITec to host the 11th Confocal Raman Imaging Symposium from September 29th - October 1st in Ulm, Germany July 28th, 2014

FEI adds Phase Plate Technology and Titan Halo TEM to its Structural Biology Product Portfolio: New solutions provide the high-quality imaging and contrast necessary to analyze the 3D structure of molecules and molecular complexes July 28th, 2014

Production of Toxic Gas Sensor Based on Nanorods July 28th, 2014

Environment

Production of Toxic Gas Sensor Based on Nanorods July 28th, 2014

Researchers Use Various Zinc Oxide Nanostructures to Boost Efficiency of Water Purification Process July 13th, 2014

Using Sand to Improve Battery Performance: Researchers develop low cost, environmentally friendly way to produce sand-based lithium ion batteries that outperform standard by three times July 8th, 2014

Development of an interactive tool for the implementation of environmental legislation for nanoparticles manufacturers July 4th, 2014

Alliances/Partnerships/Distributorships

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

Organometallics welcomes new editor-in-chief: Paul Chirik, Ph.D. July 22nd, 2014

Haydale and Goodfellow Announce Major Distribution Agreement for Functionalised Graphene Materials July 21st, 2014

SentiMag® Now Available in Australia and New Zealand July 21st, 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