A Japanese research team claims to have developed a high-sensitive, rapid response nitrogen oxide (NOx) sensor for use in automobile catalysts.

Koichi Hamamoto's device, from the Advanced Industrial Science and Technology (AIST), employs a multi-chamber sensor that uses a solid oxide electrolyte (oxygen-ion conductor), which offers greater heat resistance and is more robust than existing NOx sensors.

This structural feature coupled with the precise control of the nanostructure of the sensing electrode means that the sensor is able to detect NOx molecules five times faster than standard technology allows and is twice as sensitive as regular NOx sensors.

The device could prove a breakthrough in cutting NOx emissions, which are perceived as a drawback of the current range of clean burn engines, and might find a particular market from diesel vehicles.

A statement from AIST said: "We will continue our efforts to develop the cell structure to allow for an even higher sensitivity and faster response in NOx detection.

"We will also conduct further research by evaluating the effects of coexistent gases and the robustness of our cell, and we will make any improvements that are necessary for product realization of the sensor."

Source: Development of a High-Sensitivity Rapid-Response NOX Sensor, 28/08/07

http://www.aist.go.jp/aist_e/latest_research/2007/20070827/20070827.html

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