Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > X-Ray Probe Finds New Organic Transistors Do Well in Hot Water

Abstract:
Materials scientists from the National Institute of Standards and Technology (NIST), working with an international research team, have helped prove the stability of a novel—and rugged—thin-film membrane that could prove key to a new class of sterilizable, flexible organic electronics for medical applications.

X-Ray Probe Finds New Organic Transistors Do Well in Hot Water

Gaithersburg, MD | Posted on April 19th, 2012

The work at the NIST low-energy X-ray beam line at the National Synchrotron Light Source (NSLS) in Brookhaven, N.Y., supported an international team led by researchers from the University of Tokyo and including participants from the Japan Science and Technology Agency, Princeton University, the Max Planck Institute for Solid State Research, Hiroshima University and Nippon Kayaku Co., Ltd. of Tokyo.*

Recent years have seen significant advances in organic microelectronics that replace rigid crystalline materials such as silicon with flexible polymeric materials. Engineers are eyeing a long list of potential applications, such as lightweight computer displays that could be printed on a film and rolled up or folded. But as the study's authors point out, flexible organic circuits also could have broad application in medical devices—especially implantable devices, like soft pacemakers.

But such devices would have to be sterilized at high temperatures, and organic electronics that don't break down under such temperatures have been hard to make. A particular problem is the all-important "gate insulation" layer in an organic transistor, which has to be extremely thin—to hold down the operating voltage to a reasonable level—while maintaining electrical integrity under heating. When heated to sterilizing temperatures, the thin films have tended to develop multiple "pinholes" that wreck performance.

To solve this, the Tokyo-based team proposed a novel gate material** that "self-assembles" into an ultrathin single layer of densely packed linear molecules that line up at a slight angle to the surface rather like the hairs on a retriever. The thickness of this self-assembled monolayer (SAM) can be as small as 2 nanometers, according to the research team.

Making accurate structural measurements of such a thin film is difficult. To check the molecular orientation and thermal stability of the SAM, samples from before and after heat treatment were examined on the NIST beamline using a technique called "near-edge X-ray absorption fine-structure spectroscopy" (NEXAFS). The technique essentially detects chemical bonds both at the surface of a sample and in the interior, and is extremely sensitive—capable of telling the difference between a single and double carbon bond in a molecule, for instance. Pinholes in the SAM are visible because NEXAFS sees through them to the underlying substrate. The NEXAFS measurements demonstrated that the new SAM thin films maintained their stability and integrity at temperatures in excess of 150º Celsius. This is believed to be the first time such high thermal stability has been observed in such a thin film.

* K. Kuribara, H. Wang, N. Uchiyama, K. Fukuda, T. Yokota, U. Zschieschang, C. Jaye, D. Fischer, H. Klauk, T. Yamamoto, K. Takimiya, M. Ikeda, H. Kuwabara, T. Sekitani, Y-L. Loo and T. Someya. Organic transistors with high thermal stability for medical applications. Nature Communications. 3, 723. Mar. 6, 2012. doi:10.1038/ncomms1721

** alkylphosphonic acids

####

About National Institute of Standards and Technology (NIST)
The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce.

For more information, please click here

Contacts:
Michael Baum

301-975-2763

Copyright © National Institute of Standards and Technology (NIST)

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 Links

For more details, see the Brookhaven National Laboratory news announcement, "The World's First Sterilizable Flexible Organic Transistor," at:

Related News Press

News and information

A step closer to understanding quantum mechanics: Swansea University’s physicists develop a new quantum simulation protocol October 22nd, 2017

Creation of coherent states in molecules by incoherent electrons October 21st, 2017

Strange but true: turning a material upside down can sometimes make it softer October 20th, 2017

Leti Coordinating Project to Develop Innovative Drivetrains for 3rd-generation Electric Vehicles: CEA Tech’s Contribution Includes Liten’s Knowhow in Magnetic Materials and Simulation And Leti’s Expertise in Wide-bandgap Semiconductors October 20th, 2017

MIPT scientists revisit optical constants of ultrathin gold films October 20th, 2017

Imaging

Creation of coherent states in molecules by incoherent electrons October 21st, 2017

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

Seeing the next dimension of computer chips: Researchers image perfectly smooth side-surfaces of 3-D silicon crystals with a scanning tunneling microscope, paving the way for smaller and faster computing devices October 11th, 2017

Thin films

MIPT scientists revisit optical constants of ultrathin gold films October 20th, 2017

Laboratories

Spin current detection in quantum materials unlocks potential for alternative electronics October 15th, 2017

Injecting electrons jolts 2-D structure into new atomic pattern: Berkeley Lab study is first to show potential of energy-efficient next-gen electronic memory October 13th, 2017

Rice U. lab surprised by ultraflat magnets: Researchers create atom-thick alloys with unanticipated magnetic properties October 13th, 2017

Govt.-Legislation/Regulation/Funding/Policy

Leti Coordinating Project to Develop Innovative Drivetrains for 3rd-generation Electric Vehicles: CEA Tech’s Contribution Includes Liten’s Knowhow in Magnetic Materials and Simulation And Leti’s Expertise in Wide-bandgap Semiconductors October 20th, 2017

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

Long nanotubes make strong fibers: Rice University researchers advance characterization, purification of nanotube wires and films October 17th, 2017

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Chip Technology

Novel 'converter' heralds breakthrough in ultra-fast data processing at nanoscale: Invention bagged four patents and could potentially make microprocessor chips work 1,000 times faster October 20th, 2017

MIPT scientists revisit optical constants of ultrathin gold films October 20th, 2017

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

Spin current detection in quantum materials unlocks potential for alternative electronics October 15th, 2017

Discoveries

A step closer to understanding quantum mechanics: Swansea University’s physicists develop a new quantum simulation protocol October 22nd, 2017

Creation of coherent states in molecules by incoherent electrons October 21st, 2017

Novel 'converter' heralds breakthrough in ultra-fast data processing at nanoscale: Invention bagged four patents and could potentially make microprocessor chips work 1,000 times faster October 20th, 2017

Strange but true: turning a material upside down can sometimes make it softer October 20th, 2017

Announcements

A step closer to understanding quantum mechanics: Swansea University’s physicists develop a new quantum simulation protocol October 22nd, 2017

Creation of coherent states in molecules by incoherent electrons October 21st, 2017

Strange but true: turning a material upside down can sometimes make it softer October 20th, 2017

Leti Coordinating Project to Develop Innovative Drivetrains for 3rd-generation Electric Vehicles: CEA Tech’s Contribution Includes Liten’s Knowhow in Magnetic Materials and Simulation And Leti’s Expertise in Wide-bandgap Semiconductors October 20th, 2017

Research partnerships

Novel 'converter' heralds breakthrough in ultra-fast data processing at nanoscale: Invention bagged four patents and could potentially make microprocessor chips work 1,000 times faster October 20th, 2017

Strange but true: turning a material upside down can sometimes make it softer October 20th, 2017

Leti Coordinating Project to Develop Innovative Drivetrains for 3rd-generation Electric Vehicles: CEA Tech’s Contribution Includes Liten’s Knowhow in Magnetic Materials and Simulation And Leti’s Expertise in Wide-bandgap Semiconductors October 20th, 2017

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

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