The research interest on gas sensors has been increased during the last decade due to their wide use to a variety of sectors such as environment, air quality, health, energy, ‘smart’ food packaging etc. as well as to the on-line monitoring of the corresponding gases through the Internet of Things (IoT). The sensing element is the “heart” of a sensing device, thus it determines the performance of the sensor. Plenty of materials has been investigated as sensing elements against various gases, using different measurement techniques.
In this presentation, the synthesis, characterization and investigation of gas sensing performance of materials such as metal oxide semiconductors (MOS), metal oxide heterostructures, perovskites as well as of metal coordinated thiocyanates will be presented. The sensing technique that was mainly used was the conductometric one, however the results of both surface acoustic waves (SAW) and optical gas sensing methods will also be showed.