Specialists from Skoltech have created an «electronic nose» made of titanium nanotubes
Researchers from the Skolkovo Institute of Science and Technology «Skoltech» and the Karlsruhe Institute of Technology (KIT) have created a new kind of sensors, which in addition to high sensitivity, have an unique selectivity. The sensors may be used in devices for determining the degree of air pollution and in medical devices.
Modern gas sensors are made, among other things, from carbon materials and various polymers. These devices have a high sensitivity and can react to a small amount of gases and vapors in the air. At the same time, many sensors are not selective, and with their help it is impossible to accurately determine the gases proportion in the air, especially if gases or vapors have similar chemical properties.
The new device, created by scientists is made of ordered sets of nanotubes from titanium dioxide — a substance that changes the electrical resistance if any gases are in the air. Several sets of sensors slightly differ from each other in properties and interact with different gases in different ways. Based on the reaction of nanotubes, it is possible to determine what kind of substances are contained in the air with a high degree of accuracy, the «Skoltech» press service told.
«As a part of the laboratory studies, we were able to test the system response to the content of acetone, isopropanol, and ethanol in the air. The last two gases are very similar to each other from a chemical point of view. We were able not only to detect these gases, but also to determine their type,» the «Skoltech» representative explained. In the future, the device can find use in indicators of air pollution and in a number of medical devices that determine the content of substances in the expired air.
The study involved scientists from the Institute of Radio-engineering and Electronics RAS and the Saratov State Technical University. The study results are published in Scientific Reports.
Liked it? Share it! —