Semiconductor Oxide Gas Sensors
Electrical and Computer Engineering
3rd Cycle Studies
Semiconductors and solid-state physics.
The curricular unit uses both seminar as tutorial classes, for exposition of the subjects addressed and for preparation of the research work, respectively.
Comprehension of the physical and chemical phenomena behind the detection process of gases by means of semiconductors. Fabrication and characterisation process of sensors. Fabrication and characterisation of one semiconducting sensor.
Characterisation of semiconducting oxide gas sensors. Oxides surface: basic surface reactions. Conduction mechanisms and electrical response of the sensors. Semiconducting oxides: electrical response due to semiconducting material type. Surface oxygen relation with adsorption and desorption process. Oxidizing and reducing gases. Sensor type, function of the sensing principle. Measuring electrodes: adhesion and geometry influence, in the sensors electrical response. Catalysts.
Pedro Manuel Gens de Azevedo de Matos Faia
The evaluation of the course is the sum of two components: 1) 50% of the final mark consists in a seminar work, preparatory of the experimental work which will follow; 2) the remaining 50% will be the experimental work itself: 100.0%
Toshko G. Nenov and all, "Ceramic Sensors: Technology and Applications"
P.T.Moseley and all, "Techniques and mechanisms in gas sensing"