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Matteo Tonezzer

Honorable Organizing Committee Member for Catalysis 2021 Conference -  Matteo Tonezzer
Matteo Tonezzer
IMEM-CNR, Italy
Title : Nanowires in a thermal gradient: from resistive chemosensors to smart detection

Abstract:

Resistive sensors based on metal oxide nanostructures are very interesting because they are tiny, simple, cheap to fabricate and to use, possibly low power consuming, and can sense almost any gas. Unfortunately, this last property is not so positive, because it means that these solid state sensors completely lack selectivity. This comes from the fact that their response is one-dimensional, a dimensionless ratio that indicates at most whether the gas is oxidizing or reducing. This negative aspect can be circumvented by combining the response in different conditions (for example at different working temperatures) so as to get more significant information. Indeed, combining N sensors working at different temperatures, we obtain an N-dimensional point that contains the information of N raw responses, but also the N*(N-1)/2 correlations between the responses themselves. Besides usual PCA visualization, this information can be used in different ways to achieve real smart detection: RGB coding gives a qualitative and semi-quantitative response (similar to a litmus paper), while machine learning algorithms make the system able to recognize the gas and estimate its concentration in a quantitative way. Both of these approaches make it possible to achieve a perfect classification of the gases tested and a very low error on the concentration estimate (5-15%), bridging the gap between simple resistive sensors and electronic noses. Tiny electronic noses that can be integrated into portable devices such as a smart phone are the first step towards a widespread network that will allow to monitor the quality of the air breathed by people and at the same time their health.

Biography:

Matteo Tonezzer received his PhD degree from the Faculty of Physics at the University of Trento, Italy. In 2011, he won the Young Scientist Award from the European Materials Research Society (EMRS). He worked in research centers in France (ESRF), Brazil (UFMG), Vietnam (HUST), Italy (INFM, CNR) , South Korea (INHA) and USA (GeorgiaTech). He is currently working for IMEM at the Italian National Research Council. His main area of interest concern the sensing properties of nanostructured organic and inorganic materials and the use of machine learning towards smart sensing.

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