Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Innovative method to fabricate complex 3D microstructures

Illustration of CNT forest growth and capillary forming sequence
Illustration of CNT forest growth and capillary forming sequence

Abstract:
Researchers from imec and the University of Michigan have reported a new technology to fabricate complex three-dimensional microstructures, with intricate bends, twists, and multidirectional textures, starting from vertically aligned carbon nanotubes (CNT). The resulting assemblies have a mechanical stiffness exceeding that of microfabrication polymers, and can be used as molds for the mass production of 3D polymer structures. The method is straightforward, in that it requires only standard two-dimensional patterning and thermal processing at ambient pressure.

Innovative method to fabricate complex 3D microstructures

Leuven, Belgium & Ann Arbor, MI | Posted on December 18th, 2010

Complex surfaces with precisely fabricated nanosized features are needed in, for example, metamaterials, substrates for cell culture and tissue engineering, smart active surfaces, and lab-on-a-chip systems. But existing methods of fabricating 3D microstructures all have their drawbacks, requiring tradeoffs in feature geometry, heterogeneity, resolution, and throughput. This new method, which the researchers have termed ‘capillary forming', promises a path to robust, deterministic fabrication of intricate structures with high mechanical stiffness.

The approach to capillary forming of CNTs starts with patterning a catalyst layer on a silicon wafer, using optical lithography. Second, that layer is used to grow microstructures made of vertically aligned CNTs - CNT forests - through thermal chemical vapor deposition (CVD) at atmospheric pressure. Next, a solvent such as acetone is condensed on the substrate. This is done by positioning the substrate, with the CNT patterns facing downward, over a container with the boiling solvent. The solvent vapor rises through the container and condenses on the substrate. Due to capillary rise, the solvent is drawn into each CNT microstructure independently. After the substrate has been exposed to the vapor for the desired duration, it is removed from the container. As a result of the process of infiltration and evaporation of the solvent liquid, capillary forces will bundle the CNTs, resulting in a transformation of the initial 2D geometries into intricate 3D structures.

With this method, it is possible to construct robust 3D assemblies of filamentary nanostructures. The researchers have demonstrated this method through the fabrication of a library of diverse CNT microarchitectures. A bending motion, for example, can be combined into twisting and bridge-shaped architectures which cannot be made using standard lithography. This new approach to manipulate nanoscale filaments using local mechanical deformations makes it easier to deterministically design and fabricate 3D microarchitectures with complex geometries as well as nanotextured surfaces. Yet it only requires a standard patterning and thermal processing at ambient pressure.

This work received the Robert M. Caddell award for outstanding research in materials and manufacturing.

Michael De Volder, Sameh H. Tawfick, Sei Jin Park, Davor Copic, Zhouzhou Zhao, Wei Lu, A. John Hart, "Diverse 3D Microarchitectures Made by Capillary Forming of Carbon Nanotubes", Advanced Materials Volume 22, Issue 39, pages 4384-4389, October 15, 2010.

####

For more information, please click here

Contacts:
Imec:
Katrien Marent
Director of External Communications
T: +32 16 28 18 80
M: +32 474 30 28 66


For Imec:
Barbara Kalkis
Maestro Marketing & PR
T: +1 408 996 9975
M: +1 408 529 4210

Copyright © imec

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

Nanoparticles Increase Durability of Concrete Decorations in Cold Areas January 26th, 2015

Iranian Researchers Boost Solar Cells Efficiency Using Anti-Aggregates January 26th, 2015

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

Possible Futures

GS7 Graphene Sensor maybe Solution in Fight Against Cancer January 25th, 2015

Nanotechnology in Energy Applications Market Research Report 2014-2018: Radiant Insights, Inc January 15th, 2015

'Mind the gap' between atomically thin materials December 23rd, 2014

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

Academic/Education

Rice's Naomi Halas to direct Smalley Institute: Optics pioneer will lead Rice's multidisciplinary science institute January 15th, 2015

SUNY Board Appoints Dr. Alain Kaloyeros as Founding President of SUNY Polytechnic Institute January 13th, 2015

CNSE's Smart System Technology & Commercialization Center Successfully Recertifies as ISO 9001:2008 January 12th, 2015

SUNY Poly Now Accepting Applications to the Colleges of Nanoscale Science and Engineering for Fall 2015: Full Scholarships Available to Incoming CNSE Students January 7th, 2015

Nanotubes/Buckyballs

Chromium-centered cycloparaphenylene rings for making functionalized nanocarbons January 26th, 2015

GS7 Graphene Sensor maybe Solution in Fight Against Cancer January 25th, 2015

Toyocolor to Launch New Carbon Nanotube Materials at nano tech 2015 January 24th, 2015

Carbon nanotube finding could lead to flexible electronics with longer battery life January 14th, 2015

Nanomedicine

Engineering self-assembling amyloid fibers January 26th, 2015

Promising use of nanodiamonds in delivering cancer drug to kill cancer stem cells: NUS study shows that delivery of Epirubicin by nanodiamonds resulted in a normally lethal dosage of Epirubicin becoming a safe and effective dosage for treatment of liver cancer January 26th, 2015

Teijin to Participate in Nano Tech 2015 January 22nd, 2015

2nd International Conference on Infectious Diseases & Nanomedicine (December 15-18, 2015, Kathmandu, NEPAL) January 22nd, 2015

Announcements

Nanoparticles Increase Durability of Concrete Decorations in Cold Areas January 26th, 2015

Iranian Researchers Boost Solar Cells Efficiency Using Anti-Aggregates January 26th, 2015

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

Grants/Awards/Scholarships/Gifts/Contests/Honors/Records

OCSiAl supports NanoART Imagery Contest January 23rd, 2015

EnvisioNano: An image contest hosted by the National Nanotechnology Initiative (NNI) January 22nd, 2015

Laser-generated surface structures create extremely water-repellent metals: Super-hydrophobic properties could lead to applications in solar panels, sanitation and as rust-free metals January 20th, 2015

NREL Scientist Brian Gregg Named AAAS Fellow: Gregg honored for distinguished contributions to the field of organic solar photoconversion January 20th, 2015

Nanobiotechnology

Nanoshuttle wear and tear: It's the mileage, not the age January 26th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

DNA 'glue' could someday be used to build tissues, organs January 14th, 2015

Photonic crystal nanolaser biosensor simplifies DNA detection: New device offers a simpler and potentially less expensive way to detect DNA and other biomolecules through changes in surface charge density or solution pH January 13th, 2015

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 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE