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:3/29/2017)... the health IT company that operates the largest health ... today announced a Series B investment from BlueCross BlueShield ... investment and acquisition accelerates higi,s strategy to create the ... activities through the collection and workflow integration of ambient ... secures data today on behalf of over 36 million ...
(Date:3/27/2017)... , March 27, 2017  Catholic Health Services ... Management Systems Society (HIMSS) Analytics for achieving Stage ... Model sm . In addition, CHS previously earned ... hospitals using an electronic medical record (EMR). ... high level of EMR usage in an outpatient ...
(Date:3/24/2017)... , Mar 24, 2017 Research and Markets ... System Market Analysis & Trends - Industry Forecast to 2025" ... ... grow at a CAGR of around 15.1% over the next decade ... industry report analyzes the market estimates and forecasts for all the ...
Breaking Biology News(10 mins):
(Date:5/23/2017)... ... May 23, 2017 , ... Vortex Biosciences , ... “Label-free isolation of prostate circulating tumor cells using Vortex microfluidic technology ” in Nature ... a collaboration with Dr. Dino Di Carlo and Dr. Matthew Rettig at the University ...
(Date:5/23/2017)... , ... May 23, 2017 , ... Bacterial biofilms, surface ... molecules, can cause diverse pathologies ranging from food poisoning and catheter infections to gum ... is in the tens of billions of dollars per year, there is currently a ...
(Date:5/22/2017)... ... May 22, 2017 , ... Stratevi, a boutique firm that partners ... Coast. It has opened an office in downtown Boston at 745 Atlantic Ave. ... more important to generate evidence on the value they provide, not just to patients, ...
(Date:5/21/2017)... ... May 19, 2017 , ... Ovation Fertility scientists’ work is ... of Bioanalysts (AAB) and the College of Reproductive Biology (CRB) today and Saturday ... to excellence in clinical laboratory services and regulations. , “We are pleased ...
Breaking Biology Technology:
Cached News: