The new nanosensors, fabricated in University of Tehran, Iran, proved capability of removing some poisonous gases like NO2 to a large extent from the polluted city zones.
A view of Tehran (2009 file photo)
"The synthesized nanosensors could sense the presence of hazardous gases such as
NO2 within city environment," Azam Anaraki Firouz, researcher at Nano Center,
University of Tehran, explained to the news service of INIC.
"Based on the obtained results, addition of molybdenum compounds increases the specific area which in turn improves sensor response," she added.
Anaraki Firouz went on to say that "ultrasonic spray pyrolysis (USP) is a semi-advanced method for production of oxide or metal particles with dimensions less than one micrometer. The device has an especial design for spraying a liquid solution by ultrasonic waves. The sprayed droplets are then directed by an air stream into an electric furnace (with temperature of 1100oC)."
In the instant research work, nano and meso porous nanostructures of molybdenum oxide-doped tin dioxide have been synthesized through ultrasonic spray pyrolysis. In these compounds, SnCl4.5H2O, ammonium hepta-molybdate, and poly methyl methacrylate (PMMA) were used respectively as the precursor, doping agent, and substrate. Also the growth and sensory mechanisms of the aforementioned compounds have been investigated.
"Because of the present shortcomings the practical use of these nanosensors is not possible for streets and city centers at the moment. Yet such an implication is hoped for the near future," Anaraki Firouz said.
Details of this research work are available in the Journal of Sensors and Actuators B, volume 147, pages 554-560, 2010.
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