报告题目：Operando Investigations of Gas Sensors Based on Semiconducting Metal Oxides (SMOX)

报 告 人 ：Dr. Nicolae Barsan   

     Institute of Physical and Theoretical Chemistry, University of Tübingen，Germany

主 持 人 ：张彤 教授

报告时间：2016年9月13日 09:00

报告地点：南区唐敖庆楼D区311报告厅

主办单位：电子科学与工程学院

     集成光电子学国家重点联合实验室

     物质科学吉林省高校高端科技创新平台

 Abstract：The Course will provide the physic-chemical knowledge basis needed for the understanding of gas sensing with semiconducting metal oxides (SMOX). 1.Motivation – historical perspective, will shortly present the rationale behind the development of SMOX gas sensors as a response to concrete application demands. 2.Functioning principle will explain the link between the surface reactions of atmospheric gases and the associated charge transfer processes. 3.General surface reactions will present the boundary conditions in which the gas sensing takes place. 4.Modelling of CO sensing: effect on carrier concentration will use the case of CO detection in dry air by an n-type SMOX as an example in order to show how the phenomena can be described. 5.Transduction: conduction in the sensing layer will examine the process of transduction of the variation of surface free charge carriers into a change of the electrical resistance of the SMOX sensitive layer.

 Dr Barsan’s research focuses on the understanding and application of surface interactions of materials with gases. Since 1984, when he started his scientific carrier at the Institute of Materials Physics and Technology in Bucharest, he was interested in the basic understanding of phenomena taking place at the surface of metal oxides operated in realistic conditions for gas sensing applications. Since 1995 he is a senior researcher at the Institute of Physical Chemistry of the University of Tübingen where, since 1999, is leading together with Prof. Udo Weimar the Gas Sensor research group. At the Institute of Physical Chemistry, he advanced his interest in the basic understanding of sensing with metal oxide pioneering the operando approach; the latter employs a host of spectroscopic and phenomenological characterization techniques, applied in sensor operation conditions, for a complete description of the gas sensing and transduction processes. Besides the obvious scientific value, the wealth of information gained by applying this approach has important practical applications.