Free Newsletter
Register for our Free Newsletters
Newsletter
Zones
Advanced Composites
LeftNav
Aerospace
LeftNav
Amorphous Metal Structures
LeftNav
Analysis and Simulation
LeftNav
Asbestos and Substitutes
LeftNav
Associations, Research Organisations and Universities
LeftNav
Automation Equipment
LeftNav
Automotive
LeftNav
Biomaterials
LeftNav
Building Materials
LeftNav
Bulk Handling and Storage
LeftNav
CFCs and Substitutes
LeftNav
Company
LeftNav
Components
LeftNav
Consultancy
LeftNav
View All
Other Carouselweb publications
Carousel Web
Defense File
New Materials
Pro Health Zone
Pro Manufacturing Zone
Pro Security Zone
Web Lec
Pro Engineering Zone
 
 
 
News

Nanoscale chemical sensors

University Of California, Davis : 23 August, 2004  (New Product)
New types of chemical sensors for environmental monitoring, food safety or security applications could be based on nanotechnology.
New types of chemical sensors for environmental monitoring, food safety or security applications could be based on nanotechnology, according to Frank Osterloh, an assistant professor of chemistry at UC Davis.

'Nanomaterials are very well suited for chemical sensor applications, because their physical properties often vary considerably in response to changes of the chemical environment,' Osterloh said. Because nanomaterials can be made up of structures just a few atoms across, just a few molecules of chemical can trigger a response, he said.

Osterloh, with graduate student Xiubin Qi and former student Jason Martino, discovered that nanowires made of lithium, molybdenum and selenium atoms show changes in electrical resistance of up to 200 percent when exposed to vapours of organic solvents. By depositing the nanowires between two conductors, they made a simple chemical sensor.

By attaching chemical groups to the nanowires, the researchers could modify the sensor to measure the acidity of a solution. The team is now investigating if this 'programming' property can be extended to make sensors for the detection of explosives or environmental contaminants such as lead in drinking water, Osterloh said.

The work was presented at the 228th national meeting of the American Chemical Society in Philadelphia, 22-26 August 2004.

Osterloh's laboratory is also experimenting with nanoscale chemical sensors based on materials that change color; nanomaterials that can be manipulated in magnetic fields; and luminescent materials.
Bookmark and Share
 
Home I Editor's Blog I News by Zone I News by Date I News by Category I Special Reports I Directory I Events I Advertise I Submit Your News I About Us I Guides
 
   © 2012 NewMaterials.com
Netgains Logo