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Safer, easier system for remote explosive detection
Date:4/9/2008

ANN ARBOR, Mich.---Detecting roadside bombs may become easier, thanks to chemical sensors being developed at the University of Michigan.

A team led by chemistry professor Theodore Goodson III has created materials that sniff out TNT and give off signals that can be detected remotely---from a moving Humvee, for example. Their work was recently described in the journal Nanotechnology and also is the subject of a presentation at the 235th national meeting of the American Chemical Society in New Orleans, April 9, 2008

The materials under study are large macromolecules made up of smaller active parts (chromophores), put together in a branching pattern. When TNT vapor contacts the material, "the TNT gets caught in the branches, as if in a sieve," said Goodson, who has a joint appointment in the Department of Macromolecular Science and Engineering. Normally, these materials emit light (fluoresce) when their molecules are excited with pulses of infrared light. But even the slightest trace of TNT quenches that fluorescence.

Goodson envisions a system in which sensors---which can be made for about $10 each---are positioned along the roadside and in other important locations. Passing military vehicles would be equipped with lasers to shoot infrared light at the sensors to excite the fluorescence and a specially-designed light-collection system to detect the sensors' response. Any sensors that don't fluoresce would be tip-offs to possible locations of roadside bombs.

Goodson's remote detection scheme relies on highly sensitive, low-cost, battery-free, thin film sensors which require no electronic equipment or excitation source at the sites where they are installed. In contrast, conventional chemical TNT sensors for explosive detection have no remote capability and must be used in close proximity to the suspicious site, increasing the danger for military personnel. Using infrared light to excite the remote sensors minimizes light-scatte
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Contact: Nancy Ross-Flanigan
rossflan@umich.edu
734-647-1853
University of Michigan
Source:Eurekalert

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