Navigation Links
Sniffing out shoe bombs: A new and simple sensor for explosive chemicals
Date:10/19/2010

CHAMPAIGN, Ill. University of Illinois chemists have developed a simple sensor to detect an explosive used in shoe bombs. It could lead to inexpensive, easy-to-use devices for luggage and passenger screening at airports and elsewhere.

Triacetone triperoxide (TATP) is a high-powered explosive that in recent years has been used in several bombing attempts. TATP is easy to prepare from readily available components and has been difficult to detect. It defies most standard methods of chemical sensing: It doesn't fluoresce, absorb ultraviolet light or readily ionize.

The few methods available to screen for TATP aren't feasible for on-the-ground use in airports, as they require large, expensive equipment, extensive sample preparation, or relatively high concentrations of TATP in solid or liquid form. There is no simple way to detect TATP vapor.

Kenneth Suslick, the Schmidt Professor of Chemistry at the U. of I., and postdoctoral researcher Hengwei Lin have developed a colorimetric sensor array that can quantitatively detect even very low levels of TATP vapor down to a mere 2 parts per billion. They wrote about their findings in an article published in the Journal of the American Chemical Society.

To create the sensor array, the researchers print a series of 16 tiny colored dots each a different pigment on an inert plastic film. A solid acid catalyst breaks down TATP into detectable components that cause the pigments to change color, like litmus paper.

Each pigment changes colors depending on the concentration of TATP in the air. The array is digitally imaged with an ordinary flatbed scanner or an inexpensive electronic camera before and after exposure to the air.

"Imagine a polka-dotted postage stamp sensor that can sniff out the shoe-bomber explosive simply by using a digital camera to measure the changing colors of the sensor's spots," Suslick said. "The pattern of the color change is a unique molecular fingerprint for TATP at any given concentration and we can identify it in a matter of seconds."

The array is uniquely sensitive to TATP. Unlike many other chemical sensors, Suslick and Lin's array is unaffected by changes in humidity or exposure to other chemicals, such as personal hygiene products or laundry detergents. It also has a long shelf life, so airport security and other users can keep a supply on hand.

In addition to demonstrating their sensing technique with an ordinary flatbed scanner, the researchers also developed a functional prototype hand-held device. The portable instrument, designed to easily screen luggage or shoes, uses inexpensive white LED illumination and an ordinary digital camera similar to a cell-phone camera.

"The hand-held device makes the whole process portable, sensitive, fast and inexpensive," Suslick said. The hand-held sensor now is being commercialized by iSense, a senor manufacturer based in Palo Alto, Calif.

"One of the nice things about this technology is that it uses components that are readily available and relatively inexpensive," said David Balshaw, Ph.D. program administrator at National Institute of Environmental Health Sciences, which supported the project.


'/>"/>

Contact: Liz Ahlberg
eahlberg@illinois.edu
217-244-1073
University of Illinois at Urbana-Champaign
Source:Eurekalert

Related biology news :

1. Sniffing out a better chemical sensor
2. Diversity of trees in Ecuadors Amazon rainforest defies simple explanation
3. Simple chemical procedure augments therapeutic potential of stem cells
4. A simple fusion to jump-start evolution
5. Artificial cells, simple model for complex structure
6. Simple test helps predict heart attack risk
7. Pitt-led researchers create quick, simple fluorescent detector for TB
8. Author says challenging simple concepts can save planet
9. Simple drug treatment may prevent nicotine-induced SIDS: Study
10. New blood tests promise simple, cost-effective diagnosis of gastrointestinal cancers
11. Scientists take step toward simple and portable tuberculosis tests for developing world
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/27/2017)... CENTRE, N.Y. , March 27, 2017 /PRNewswire-USNewswire/ ... Healthcare Information and Management Systems Society (HIMSS) Analytics ... Outpatient EMR Adoption Model sm . In addition, ... 12% of U.S. hospitals using an electronic medical ... CHS for its high level of EMR usage ...
(Date:3/24/2017)... -- Research and Markets has announced the addition of ... - Industry Forecast to 2025" report to their offering. ... The Global Biometric Vehicle ... around 15.1% over the next decade to reach approximately $1,580 million ... estimates and forecasts for all the given segments on global as ...
(Date:3/23/2017)... Research and Markets has announced the addition of the "Global ... 2025" report to their offering. ... The Global Vehicle Anti-Theft System Market is ... next decade to reach approximately $14.21 billion by 2025. ... all the given segments on global as well as regional levels ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... BioMedGPS announces expanded coverage of ... newest module, US Hemostats & Sealants. , SmartTRAK’s US Market for Hemostats and ... synthetic sealants and biologic sealants used in surgical applications. BioMedGPS estimates the market ...
(Date:10/11/2017)... ... October 11, 2017 , ... The CRISPR-Cas9 system ... experiments and avoiding the use of exogenous expression plasmids. The simplicity of programming ... systematic gain-of-function studies. , This complement to loss-of-function studies, such as with ...
(Date:10/11/2017)... , Oct. 11, 2017  VMS BioMarketing, a leading provider ... nationwide oncology Clinical Nurse Educator (CNE) network, which will launch ... for communication among health care professionals to enhance the patient ... office staff, and other health care professionals to help women ... cancer. ...
(Date:10/11/2017)... ... October 11, 2017 , ... Singh Biotechnology today announced ... to SBT-100, its novel anti-STAT3 (Signal Transducer and Activator of Transcription 3) B ... to cross the cell membrane and bind intracellular STAT3 and inhibit its function. ...
Breaking Biology Technology: