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O: Fachverband Oberflächenphysik
O 40: Heterogeneous Catalysis: Experiment
O 40.8: Talk
Tuesday, March 8, 2016, 15:45–16:00, S053
In-situ temperature measurement using chemoelectronic nanodiodes — •Jan Philipp Meyburg, Detlef Diesing, and Eckart Hasselbrink — Fakultät für Chemie, Universität Duisburg-Essen, Essen, Germany
Chemoelectronic nanodiodes based on metal–insulator–metal thin film structures allow the detection of hot charge carriers that are excited in the course of surface reactions. In this context, the Pt-catalyzed oxidation of carbon monoxide is studied on a Pt–Ta2O5–Ta nanodiode. In order to activate this surface reaction locally the nanodiode is heated while the sample holder is held at a constant temperature below 80 K. Thus, a temperature gradient results and an accurate in-situ temperature measurement is required. During a continuous variation of the potential between the Pt electrode and the Ta electrode a device current is recorded that exhibits a temperature dependence. Consequently, this current can be used in order to monitor the device temperature. Therewith, exclusively the temperature of the nanoscopic MIM volume is measurable during the reaction process.