Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Surface Chemical Reactions and Heterogeneous Catalysis II

O 30.9: Vortrag

Dienstag, 1. April 2014, 12:30–12:45, PHY C 213

Temperature programmed desorption from chemoelectronic nanodiodes — •Jan Philipp Meyburg, Ievgen Nedrygailov, Eckart Hasselbrink, and Detlef Diesing — Fakultät für Chemie, Universität Duisburg-Essen, Essen, Germany

Chemoelectronic nanodiodes based on metal–oxide–semiconductor thin film structures allow the in-situ detection of energy release on the top metal electrode of the devices when a surface reaction takes place. This energy can be transported through the nanodiode by hot charge carriers that lead to a detectable current. While the contribution of hot carriers during oxidation and adsorption processes is already reported, the involvement of hot carriers during desorption processes is still to be observed. In this context, temperature programmed desorption from the surface of Pt–SiO2n-Si chemoelectronic nanodiodes is demonstrated using a heating method that allows for desorbing locally from the Pt top electrode. For this purpose, the 5 nm Pt top electrode is directly heated from 80 to 300 K by a current flow. Simultaneously the temperature is monitored by measuring the Pt film resistance. Reproducible results for water desorption are obtained using this method.

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