HOME >> BIOLOGY >> NEWS
New gas sensors patterned with conducting polymer

An improved method for depositing nanoporous, conducting polymer films on miniaturized device features has been demonstrated by researchers at the National Institute of Standards and Technology (NIST).

Described in the April 6 issue of the Journal of the American Chemical Society,* the method may be useful as a general technique for reproducibly fabricating microdevices such as sensors for detecting toxic chemicals.

Unlike most polymers, conducting polymers have the electrical and optical properties of metals or semiconductors. These materials are of increasing interest in microelectronics because they are inexpensive, flexible and easy to synthesize.

Polyaniline is a particularly promising conducting polymer for microelectronics applications, but it is difficult to process because it doesn't dissolve in most solvents. NIST researchers have circumvented this problem by dispersing nanoscale particles of polyaniline into a mild solvent.

"The beauty of the method," says NIST guest researcher Guofeng Li, "is that the polyaniline chain carries a natural positive charge." Once the particles are formed, electrostatic repulsion prevents them from clumping together. Moreover, the positively charged particles then can be manipulated and patterned on complex device structures by applying an electrical field.

The process produces a sponge-like coating that efficiently captures gaseous molecules. So far NIST researchers have demonstrated that such coatings can detect the difference between methanol and water vapor. Additional tests will be needed before the polymer devices could be used for detecting toxic gases.

NIST holds patents for previous work using microheaters coated with nanostructured tin oxide films. As the microheaters cycle through a series of temperatures, changes in electrical resistance are used to detect toxic gases at part per billion levels. Ultimately, NIST researchers hope to develop inexpensive arrays of mi
'"/>

Contact: Gail Porter
gail.porter@nist.gov
301-975-3392
National Institute of Standards and Technology (NIST)
12-Apr-2005


Page: 1 2

Related biology news :

1. Space-borne sensors help Africa tackle water shortage problems
2. Nanotechnology helps scientists make bendy sensors for hydrogen vehicles
3. Magnetic computer sensors may help study biomolecules
4. Flexible electronics could find applications as sensors, artificial muscles
5. Microscopic sea creatures provide foundation for gas sensors and other devices
6. Biologically inspired sensors can augment sonar, vision system in submarines
7. Breakthrough in nanodevice synthesis revolutionizes biological sensors
8. Salk scientist Ron Evans wins 2006 Gairdner Award for his discovery of hormone sensors
9. DNA-wrapped carbon nanotubes serve as sensors in living cells
10. MERIS/AATSR Workshop looks at twin sensors with many uses
11. MERIS/AATSR Workshop: Focus on Envisat sensors measuring heat and light

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: New gas sensors patterned with conducting polymer

(Date:7/24/2014)... gathered at NJIT this week for an all-day public ... Environmental Protection Agency (EPA) to dredge toxic sediment from ... The EPA has called the plan, which proposes removing ... sections of the riverbed, one of the largest cleanups ... dredged and disposed off-site. , "We need to ensure ...
(Date:7/24/2014)... To reduce fire hazard in the United States, wildland ... woody shrubs and suppressed trees (ladder fuels). These ... periods of low fire danger in order to dispose ... hazardous air pollutants, managers often cover all or part ... referred to as agricultural plastic, in order to keep ...
(Date:7/24/2014)... by the New Jersey Recovery Fund and conducted by ... and Public Policy at Rutgers University has found that ... the likelihood of community-based rebuilding solutions. Of the more ... were "pessimistic" or "very pessimistic" that the parts of ... better than they were before the storm; another 24 ...
Breaking Biology News(10 mins):Experts Weigh the Pros and Cons of a $1.7 Billion EPA Cleanup Plan for the Passaic River at an NJIT 2Study gives new perspective on agricultural plastic, debris burning, and air quality 2Rutgers study explores attitudes, preferences toward post-Sandy rebuilding 2
(Date:7/25/2014)... WABC Radio show out of New York City, ... will be hosting California-based Vet-Stem, Inc.’s Founder and CEO, Robert ... pets. Dr. Harman first visited the show in November ... pets suffering from osteoarthritis and other degenerative diseases, as well ... , Young has invited Dr. Harman back to dial down ...
(Date:7/25/2014)... (PRWEB) July 25, 2014 The Conferee ... for Topics for Conferee Networking. These two-hour sessions provide ... to meet and resolve problems, discuss new techniques, or ... deadline to submit a topic for consideration is August ... pittcon.org . The Conferee Networking committee will review the ...
(Date:7/25/2014)... California (PRWEB) July 25, 2014 Lawrence ... named to Thomson Reuters list of " The World's ... are part of the 3,000 researchers who were identified ... to recognize those who published the highest-impact work (2002-2012 ... research papers on combustion modeling . , "This ...
(Date:7/25/2014)... , July 25, 2014  Galmed Pharmaceuticals Ltd. ... company focused on the development and commercialization of a ... and cholesterol gallstones, today announced financial results for the ... 2014 Financial Summary: , Reported cash and cash ... with $137,000 at December 31, 2013.  , Reported ...
Breaking Biology Technology:Robert J. Harman, DVM, Founder and CEO of Vet-Stem, Inc. to Join New York Radio Host Lorry Young in Upcoming Episode of A “Paws” For Your Pet 2Robert J. Harman, DVM, Founder and CEO of Vet-Stem, Inc. to Join New York Radio Host Lorry Young in Upcoming Episode of A “Paws” For Your Pet 3Pittcon 2015 Announces Call for Topics for Conferee Networking Sessions 2Scientists Burst onto Influential List for Combustion Research 2Scientists Burst onto Influential List for Combustion Research 3Scientists Burst onto Influential List for Combustion Research 4Galmed Pharmaceuticals Reports First Half 2014 Financial Results 2Galmed Pharmaceuticals Reports First Half 2014 Financial Results 3Galmed Pharmaceuticals Reports First Half 2014 Financial Results 4Galmed Pharmaceuticals Reports First Half 2014 Financial Results 5Galmed Pharmaceuticals Reports First Half 2014 Financial Results 6
Cached News: