Electric Nose : Low Concentration Pesticides and Nerve gas can now be detected by the ‘Electric Nose’

Electric Nose : Low Concentration Pesticides and Nerve gas can now be detected by the ‘Electric Nose’

An international team of researchers led by Ivo Stassen and Rob Ameloot from KU Leuven, Belgium, have made it possible to detect pesticides and nerve gas in very low concentrations.

Researchers from KU Leuven have built a very sensitive electronic nose with metal-organic frameworks (MOFs). “MOFs are like microscopic sponges,” postdoctoral researcher Ivo Stassen explains. “They can absorb quite a lot of gas into their minuscule pores.”

“We created a MOF that absorbs the phosphonates found in pesticides and nerve gases. This means you can use it to find traces of chemical weapons such as sarin or to identify the residue of pesticides on food. This MOF is the most sensitive gas sensor to date for these dangerous substances. Our measurements were conducted in cooperation with imec, the Leuven-based nanotechnology research centre. The concentrations we’re dealing with are extremely low: parts per billion – a drop of water in an Olympic swimming pool – and parts per trillion.”

The chemical sensor can easily be integrated into existing electronic devices, Professor Rob Ameloot adds. “You can apply the MOF as a thin film over

the surface of, for instance, an electric circuit. Therefore, it’s fairly easy to equip a smartphone with a gas sensor for pesticides and nerve gas.”

“Further research will allow us to examine other applications as well,” Professor Ameloot continues. “MOFs can measure very low concentrations, so we could use them to screen someone’s breath for diseases such as lung cancer and MS in an early stage. Or we could use the signature scent of a product to find out whether food has gone bad or to distinguish imitation wine from the original. This technology, in other words, offers a wide range of perspectives.”