Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Outstanding in their field effect

Abstract:
Rice researchers print field-effect transistors with nano-infused ink

Outstanding in their field effect

Houston, TX | Posted on May 25th, 2010

Rice University researchers have discovered thin films of nanotubes created with ink-jet printers offer a new way to make field-effect transistors (FET), the basic element in integrated circuits.

While the technique doesn't exactly scale down to the levels required for modern microprocessors, Rice's Robert Vajtai hopes it will be useful to inventors who wish to print transistors on materials of any kind, especially on flexible substrates.

In results reported last week in the online edition of ACS Nano, Rice scientists working with researchers in Finland, Spain and Mexico have created nanotube-based circuitry using high-end ink-jet printers and custom inks.

Vajtai, a faculty fellow in Rice's top-ranked Mechanical Engineering and Materials Science Department, led the study. Pulickel Ajayan, Rice's Benjamin M. and Mary Greenwood Anderson Professor in Mechanical Engineering and Materials Science and of chemistry, is a co-author.

The process involved the painstaking analysis of sample circuits printed with single-walled carbon nanotubes functionalized with four types of molecules. The researchers found that a single layer of nanotubes-infused ink printed onto a transparent foil didn't conduct electricity very well. But adding layers increased the connections between nanotubes, and so increased conductivity.

"The key is printing the appropriate number of layers to get the type of conduction you want, either metallic or semiconductive," Vajtai said, adding that researchers made no attempt to separate metallic from semiconducting nanotubes, which greatly simplified the process.

They found that at room temperature, electrical transport took place through the network of semiconducting and metallic nanotubes. At low temperatures, the semiconducting nanotubes became insulators, so electron tunneling between adjacent metallic nanotubes took over.

Ultimately, for building transistors, the team used two of the four studied mixtures of functionalized nanotubes as their building blocks. Nanotubes for conductive channels were treated with polyethylene glycol (PEG) while source, drain and gate electrodes were printed with carboxylated nanotubes. A layer of PEG was used as the gate dielectric.

"This is not a perfect transistor, but it is applicable in digital electronics," Vajtai said. "There are some limitations. I doubt anyone could take a $60 ink-jet printer and print predesigned electronic circuits. But with a high-end printer, it is a fairly straightforward process and allows you to put together whatever you want." He expects manufacturing nano-FETS in bulk would require a process more akin to silk-screening.

Though the researchers' test FETs were relatively large -- about a square millimeter -- they reported that circuits could scale down to about 100 microns, about the width of a human hair, with a channel length of about 35 microns - the size of the print head. Shrinking them further might be possible with smaller print heads or pretreated hydrophilic or hydrophobic surfaces.

Vajtai said nanotube-based FETs will be good for logic-based applications that can be printed on a flexible surface but don't need a large number of circuits. "Say you want to have a raincoat made with transistors - doing whatever a raincoat needs to do that requires electricity, such as controlling and analyzing signals from several sensors and light sources, for safety. It can be done."

The paper's co-authors included primary author Eduardo Gracia-Espino of the Advanced Materials Department, Instituto Potosino de Investigacion Cientifica y Tecnologica, San Luis Potosi, Mexico; Giovanni Sala, Flavio Pino, Niina Halonen, Jani Mäklin, Géza Tóth, Krisztiçn Kordás and Heli Jantunen of the University of Oulu, Finland; Juho Luomahaara, Panu Helistö and Heikki Seppä of the VTT Technical Research Center of Finland; and Mauricio Terrones of the Universidad Carlos III of Madrid.

Funding came from Tekes, the Finnish Funding Agency for Technology and Innovation; the Academy of Finland; NGS-Nano; a National Science Foundation Materials World Network Grant; and a CONACYT-Mexico Ph.D. fellowship.

Read the abstract at: pubs.acs.org/doi/abs/10.1021/nn1000723

####

About Rice University
Located in Houston, Rice University is consistently ranked one of America's best teaching and research universities. Known for its "unconventional wisdom," Rice is distinguished by its: size -- 3,102 undergraduates and 2,237 graduate students; selectivity -- 12 applicants for each place in the freshman class; resources -- an undergraduate student-to-faculty ratio of 5-to-1; sixth largest endowment per student among American private research universities; residential college system, which builds communities that are both close-knit and diverse; and collaborative culture, which crosses disciplines, integrates teaching and research, and intermingles undergraduate and graduate work.

For more information, please click here

Contacts:
David Ruth
713-348-6327

Copyright © Rice University

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

Multi-million pound project to use nanotechnology to improve safety September 4th, 2015

Magnetic wormhole connecting 2 regions of space created for the first time: The device could have applications in medicine, opening up ways to make MRIs more comfortable for patients September 4th, 2015

Tongfang Global and QD Vision Partner to Bring Wide Color Gamut to Global Television Lines: Color IQTM quantum dots help boost company’s focus on superior color reproduction September 3rd, 2015

QEOS and GLOBALFOUNDRIES to Offer Industry’s First CMOS Platform for MillimeterWave Markets: GLOBALSOLUTIONSSM Partnership will enable next-generation wireless technologies for applications in IoT, 5G and automotive September 3rd, 2015

Thin films

Atomic Force Microscopes from Asylum Research Guide the Development of Thin Film Deposition and Etch Processes September 2nd, 2015

Hot electrons point the way to perfect light absorption: Physicists study how to achieve perfect absorption of light with the help of rough ultrathin films September 1st, 2015

Using ultrathin sheets to discover new class of wrapped shapes: UMass Amherst materials researchers describe a new regime of wrapped shapes August 31st, 2015

New material science research may advance tech tools August 31st, 2015

Govt.-Legislation/Regulation/Funding/Policy

Magnetic wormhole connecting 2 regions of space created for the first time: The device could have applications in medicine, opening up ways to make MRIs more comfortable for patients September 4th, 2015

Making nanowires from protein and DNA September 3rd, 2015

Making fuel from light: Argonne research sheds light on photosynthesis and creation of solar fuel September 3rd, 2015

Reversible Writing with Light: Self-assembling nanoparticles take their cues from their surroundings September 3rd, 2015

Possible Futures

Magnetic wormhole connecting 2 regions of space created for the first time: The device could have applications in medicine, opening up ways to make MRIs more comfortable for patients September 4th, 2015

Silk bio-ink could help advance tissue engineering with 3-D printers September 2nd, 2015

Sediment dwelling creatures at risk from nanoparticles in common household products August 13th, 2015

Harris & Harris Group Reports Financial Statements as of June 30, 2015, and Announces a Stock Repurchase Program August 10th, 2015

Academic/Education

Sustainable nanotechnology center September 1st, 2015

National Science Foundation Selects SUNY Poly CNSE for Expanded $2.1M Northeast Advanced Technological Education Center: NSF Center Locates to NanoCollege in Support of Flourishing Tech Industry in NYS September 1st, 2015

Announcing Oxford Instruments and School of Physics signing a Memorandum of Understanding August 26th, 2015

Kwansei Gakuin University in Hyogo, Japan, uses Raman microscopy to study crystallographic defects in silicon carbide wafers August 25th, 2015

Chip Technology

GLOBALFOUNDRIES and Catena Partner to Provide Next-Generation RF Connectivity Solutions for Growing Wireless Markets: Catena Wi-Fi and Bluetooth RF technologies available on GLOBALFOUNDRIES 28nm Super Low Power Process technology September 3rd, 2015

For 2-D boron, it's all about that base: Rice University theorists show flat boron form would depend on metal substrates September 2nd, 2015

Phagraphene, a 'relative' of graphene, discovered September 2nd, 2015

Nanometrics to Participate in the Citi 2015 Global Technology Conference August 26th, 2015

Nanotubes/Buckyballs/Fullerenes

For 2-D boron, it's all about that base: Rice University theorists show flat boron form would depend on metal substrates September 2nd, 2015

$200K Awarded to Develop In Vitro Lung Test for Toxicity of Inhaled Nanomaterials: In Vitro Lung Test Designed to Protect Human Health and Replace Animal Testing September 1st, 2015

Developing Component Scale Composites Using Nanocarbons August 26th, 2015

Southampton scientists find new way to detect ortho-para conversion in water August 25th, 2015

Nanoelectronics

Turning clothing into information displays September 2nd, 2015

Phagraphene, a 'relative' of graphene, discovered September 2nd, 2015

Nanotechnology that will impact the Security & Defense sectors to be discussed at NanoSD2015 conference August 25th, 2015

'Quantum dot' technology may help light the future August 19th, 2015

Announcements

Multi-million pound project to use nanotechnology to improve safety September 4th, 2015

Magnetic wormhole connecting 2 regions of space created for the first time: The device could have applications in medicine, opening up ways to make MRIs more comfortable for patients September 4th, 2015

Making nanowires from protein and DNA September 3rd, 2015

Making fuel from light: Argonne research sheds light on photosynthesis and creation of solar fuel September 3rd, 2015

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

Multi-million pound project to use nanotechnology to improve safety September 4th, 2015

Making nanowires from protein and DNA September 3rd, 2015

Reversible Writing with Light: Self-assembling nanoparticles take their cues from their surroundings September 3rd, 2015

A marine creature's magic trick explained: Crystal structures on the sea sapphire's back appear differently depending on the angle of reflection September 2nd, 2015

Research partnerships

QEOS and GLOBALFOUNDRIES to Offer Industry’s First CMOS Platform for MillimeterWave Markets: GLOBALSOLUTIONSSM Partnership will enable next-generation wireless technologies for applications in IoT, 5G and automotive September 3rd, 2015

Turning clothing into information displays September 2nd, 2015

Sustainable nanotechnology center September 1st, 2015

$200K Awarded to Develop In Vitro Lung Test for Toxicity of Inhaled Nanomaterials: In Vitro Lung Test Designed to Protect Human Health and Replace Animal Testing September 1st, 2015

Printing/Lithography/Inkjet/Inks

Silk bio-ink could help advance tissue engineering with 3-D printers September 2nd, 2015

These microscopic fish are 3-D-printed to do more than swim: Researchers demonstrate a novel method to build microscopic robots with complex shapes and functionalities August 26th, 2015

New research may enhance display & LED lighting technology: Large-area integration of quantum dots and photonic crystals produce brighter and more efficient light August 9th, 2015

Spintronics: Molecules stabilizing magnetism: Organic molecules fixing the magnetic orientation of a cobalt surface/ building block for a compact and low-cost storage technology/ publication in Nature Materials July 25th, 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







Car Brands
Buy website traffic