Manufacturing explosive detectors from carbon nanotubes

In addition to the use of fire retardant clothing, super flexible capacitors and carbon fiber, recent carbon nanotubes have also been used as sensors to detect explosives and toxic chemicals.

>>> Israel develop explosive detectors using nanotechnology

Professor Zang with the chemical sensor prototype uses carbon nanotubes. (Photo: Gizmag)

A prototype device developed by the research team at the University of Utah (US) consists of two electrodes, the middle of which is carbon nanotubes. In the normal environment there is no explosive or toxic chemicals, the current between the two electrodes passing the nanotubes is determined at a stable level. But when there is enough chemical molecules in place, carbon nanotubes begin to react to them, increasing or decreasing the current. When the current senses a change, the sensor will warn the user.

Professor Ling Zang, the lead researcher, said the device could detect more than 10 common explosives and about 20 toxic chemicals, including sarin neural and chlorine gas. Because the nanomaterial is exposed to air, the device is more sensitive and accurate than the current explosive sensor. In addition to the fast results in seconds, the new sensor is also economically efficient when the number of nanotubes used in each device is small.

The Vaporsens, which specializes in chemical detection tools, is expected to be launched early next year. The technology could also help boost security at airports.

References: Gizmag