HOME >> BIOLOGY >> NEWS
UCSD chemists develop portable nerve gas sensor

cules of hydrogen fluoride hit its surface. "These silicon interferometers can detect very, very small changes in color," says Sailor.

The key to their sensitive detection is the use of a small laser, similar to that found in CD players, which measures the small changes in intensity of light reflecting from the optical coating on the surface of the silicon chip. "It turns out that if you take a laser that's at the right frequency that matches the properties of that layer, you can measure very small amounts of chemicals as they enter the coating," says Sailor.

While the diode laser that the UCSD scientists built for their sensor is a bit more sophisticated than those in inexpensive CD players, it can be reproduced cheaply. In fact, the researchers' first sensors were constructed from five inexpensive CD players they purchased at Fry's, a local electronics discounter. "Our program manager at the Defense Advanced Projects Research Agency, which sponsored our research, raised an eyebrow when I told him that story," says Sailor. "But for 24 bucks, we got an interferometer that was sensitive enough to detect chemicals in the parts per billion range."

The low-cost feature of the UCSD design should make it possible to deploy handfuls of sensors in a terrorist nerve-gas attack, like the 1995 Tokyo subway bombing, in which sarin was used. Because the laser is capable of recording the accumulation of hydrogen fluoride molecules on the silicon chip's surface, the sensor can also be used as a dosimeter. "You can tell how much nerve gas an area has been exposed to," says Sailor.

He says the main advantage of the sensor is that it is more specific to the detection of G-type nerve agents than the surface acoustic-wave devices, which are currently used to detect nerve gas, but which tend to produce an excess of false alarms.

"The advantage of this new development is that we'll be able to reduce the false-alarm rate," adds Sailor, whose team p
'"/>

Contact: Kim McDonald
kimmcdonald@ucsd.edu
858-534-7572
University of California - San Diego
20-Aug-2000


Page: 1 2 3

Related biology news :

1. NIH roadmap for biomedical research focus of chemists at American Chemical Society meeting
2. New multidisciplinary research tops chemists meeting Aug. 22-26
3. Wisconsin chemists find a new chink in TBs armor
4. UCLA chemists develop new coating for nanoscale probes
5. NJIT chemists pave way for cheap, usable field test for polluted, toxic, water, air, food
6. Frog skin and supercomputers lead Penn chemists to designing better bacteria killers
7. Purdue chemists put the twist on protein building block
8. New pollutant cleanup technique puzzles, pleases chemists
9. Homeland security symposium covers what chemists can do to help protect the nation
10. Michigan, Connecticut and Illinois chemists receive award for drug to combat antibiotic resistance
11. Carnegie Mellon University chemists create versatile polymer brushes

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/22/2016)... June 22, 2016   Acuant , ... verification solutions, has partnered with RightCrowd ® ... for Visitor Management, Self-Service Kiosks and Continuous ... that add functional enhancements to existing physical ... and venues with an automated ID verification ...
(Date:6/16/2016)... FRANCISCO , June 16, 2016 ... size is expected to reach USD 1.83 ... by Grand View Research, Inc. Technological proliferation and ... banking applications are expected to drive the market ... ) , The development of advanced ...
(Date:6/7/2016)... 7, 2016  Syngrafii Inc. and San Antonio ... that includes integrating Syngrafii,s patented LongPen™ eSignature "Wet" ... collaboration will result in greater convenience for SACU ... while maintaining existing document workflow and compliance requirements. ... Highlights: ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... On Wednesday, June 22, 2016, the ... the Dow Jones Industrial Average edged 0.27% lower to finish ... 0.17%. Stock-Callers.com has initiated coverage on the following equities: Infinity ... NKTR ), Aralez Pharmaceuticals Inc. (NASDAQ: ... ). Learn more about these stocks by accessing their free ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... regulatory and technical consulting, provides a free webinar on Performing Quality ... 13, 2016 at 12pm CT at no charge. , Incomplete investigations are still ...
(Date:6/23/2016)... , June 22, 2016  Amgen (NASDAQ: ... of the QB3@953 life sciences incubator to ... health. The shared laboratory space at QB3@953 was created ... a key obstacle for many early stage organizations - ... of the sponsorship, Amgen launched two "Amgen Golden Ticket" ...
(Date:6/22/2016)... , June 22, 2016 Cell ... will allow them to produce up to one ... one lot within one week. These high-quality, consistent ... laboriously preparing cells and spend more time doing ... through a proprietary, high-volume manufacturing process that produces ...
Breaking Biology Technology:
Cached News: