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

New tool allows scientists to visualize 'nanoscale' processes May 4th, 2016

FEI Launches Apreo – Industry-Leading Versatile, High-Performance SEM: The Apreo SEM provides high-resolution surface information with excellent contrast, and the flexibility to accommodate a large range of samples, applications and conditions May 4th, 2016

Little ANTs: Researchers build the world's tiniest engine May 3rd, 2016

An Experiment Seeks to Make Quantum Physics Visible to the Naked Eye May 3rd, 2016

Thin films

Flipping a chemical switch helps perovskite solar cells beat the heat April 26th, 2016

Thin-film solar cells: How defects appear and disappear in CIGSe cells: Concentration of copper plays a crucial role April 23rd, 2016

Making electronics out of coal: Instead of burning up this complex hydrocarbon, let's make devices from it April 20th, 2016

Atomically thin sensor detects harmful air pollution in the home April 18th, 2016

Govt.-Legislation/Regulation/Funding/Policy

New tool allows scientists to visualize 'nanoscale' processes May 4th, 2016

A compact, efficient single photon source that operates at ambient temperatures on a chip: Highly directional single photon source concept is expected to lead to a significant progress in producing compact, cheap, and efficient sources of quantum information bits for future appls May 3rd, 2016

Little ANTs: Researchers build the world's tiniest engine May 3rd, 2016

An Experiment Seeks to Make Quantum Physics Visible to the Naked Eye May 3rd, 2016

Possible Futures

New tool allows scientists to visualize 'nanoscale' processes May 4th, 2016

Nuclear pores captured on film: Using an ultra fast-scanning atomic force microscope, researchers from the University of Basel have filmed 'living' nuclear pore complexes at work for the first time May 3rd, 2016

Little ANTs: Researchers build the world's tiniest engine May 3rd, 2016

An Experiment Seeks to Make Quantum Physics Visible to the Naked Eye May 3rd, 2016

Academic/Education

JPK reports on the use of a NanoWizard AFM system at the University of Kaiserslautern to study the interaction of bacteria with microstructured surfaces April 28th, 2016

The Ottawa Hospital Research Institute uses the ZetaView from Particle Metrix to study membrane microparticles as potential biomarkers for underlying diseases April 12th, 2016

FEI Partners with Five Pharmaceutical Companies, the Medical Research Council and the University of Cambridge to form Cryo-EM Research Consortium April 5th, 2016

SUNY Poly, in Collaboration with the George Washington School of Medicine and Health Sciences and Stony Brook University, Demonstrates Pioneering Method to Visualize and Identify Engineered Nanoparticles in Tissue March 25th, 2016

Chip Technology

A compact, efficient single photon source that operates at ambient temperatures on a chip: Highly directional single photon source concept is expected to lead to a significant progress in producing compact, cheap, and efficient sources of quantum information bits for future appls May 3rd, 2016

Spintronics for future information technologies: Spin currents in topological insulators controlled May 2nd, 2016

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Exploring phosphorene, a promising new material April 29th, 2016

Nanotubes/Buckyballs/Fullerenes

Non-animal approach to predict impact of nanomaterials on human lung published Archives of Toxicology publishes workshop recommendations May 2nd, 2016

Clay nanotube-biopolymer composite scaffolds for tissue engineering May 1st, 2016

NREL finds nanotube semiconductors well-suited for PV systems April 27th, 2016

Researchers create artificial protein to control assembly of buckyballs April 27th, 2016

Nanoelectronics

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Exploring phosphorene, a promising new material April 29th, 2016

With simple process, UW-Madison engineers fabricate fastest flexible silicon transistor April 21st, 2016

All powered up: UCI chemists create battery technology with off-the-charts charging capacity April 21st, 2016

Announcements

New tool allows scientists to visualize 'nanoscale' processes May 4th, 2016

FEI Launches Apreo – Industry-Leading Versatile, High-Performance SEM: The Apreo SEM provides high-resolution surface information with excellent contrast, and the flexibility to accommodate a large range of samples, applications and conditions May 4th, 2016

Nuclear pores captured on film: Using an ultra fast-scanning atomic force microscope, researchers from the University of Basel have filmed 'living' nuclear pore complexes at work for the first time May 3rd, 2016

Little ANTs: Researchers build the world's tiniest engine May 3rd, 2016

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

A compact, efficient single photon source that operates at ambient temperatures on a chip: Highly directional single photon source concept is expected to lead to a significant progress in producing compact, cheap, and efficient sources of quantum information bits for future appls May 3rd, 2016

An Experiment Seeks to Make Quantum Physics Visible to the Naked Eye May 3rd, 2016

Brookhaven's Oleg Gang Named a Battelle 'Inventor of the Year': Recognized for work using DNA to guide and regulate the self-assembly of nanoparticles into clusters and arrays with controllable properties April 25th, 2016

Zip software can detect the quantum-classical boundary: Compression of experimental data reveals the presence of quantum correlations April 21st, 2016

Research partnerships

Making invisible physics visible: The Jayich Lab has created a new sensor technology that captures nanoscale images with high spatial resolution and sensitivity May 2nd, 2016

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Personal cooling units on the horizon April 29th, 2016

Exploring phosphorene, a promising new material April 29th, 2016

Printing/Lithography/Inkjet/Inks

Electrically Conductive Graphene Ink Enables Printing of Biosensors April 23rd, 2016

Highlights from the Graphene Flagship April 22nd, 2016

Penn engineers develop first transistors made entirely of nanocrystal 'inks April 11th, 2016

Researchers use 3-D printing to create structure with active chemistry April 4th, 2016

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