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Nanotechnology helps scientists make bendy sensors for hydrogen vehicles

ity and shock resistance. The sensors are also able to be wrapped around curved surfaces, and this proves useful in many applications, notably in vehicles, aircraft and portable electronics.

The leakage of hydrogen caused by tiny pinholes in the pipe of a space shuttle, for example, could not be easily detected by individual rigid detectors because the locations of pinholes are not predetermined, said Sun. However, laminating a dense array of flexible sensors on the surfaces of the pipe can detect any hydrogen leakage prior to diffusion to alert control units to take action.

Flexible hydrogen sensors show a change of 75 percent in their resistance when exposed to hydrogen at a concentration of 0.05 percent in air. The devices can detect the presence of 1 percent hydrogen at room temperature in 3 seconds. Even after bendingwith a bending radius of approximately 7.5 mmand relaxing 2,000 times, the devices still perform with as much effectiveness.


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Contact: Sylvia Carson
scarson@anl.gov
630-252-5510
DOE/Argonne National Laboratory
31-Jul-2007


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