Dresden 2014 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Interfaces and Thin Films II
CPP 16.13: Talk
Tuesday, April 1, 2014, 12:45–13:00, ZEU 114
Morphology, Mechanical Stability and Protective Properties of Ultrathin Gallium Oxide Coatings — •Frank Lawrenz1, Philipp Lange2, Nikolai Severin2, Jürgen P. Rabe2, Christiane A. Helm1, and Stephan Block3 — 1Inst. f. Physik, Uni Greifswald, 17487 Greifswald, Germany — 2Dept. of Physics, Humboldt-Universität zu Berlin,12489 Berlin, Germany — 3Chalmers University of Technology, Gothenburg, Sweden
Scanning Force Microscopy (SFM) imaging of surfaces treated with liquid gallium shows extended, ultrathin layers, which are attributed to gallium oxide (GaOx) films. These 3 nm thick GaOx layers exhibit high mechanical stability as can be concluded from large forces required to rupture them with the SFM tip. We investigate the permeability of the films to oxygen and water. For this we cover fluorescent thin films made of conjugated polymers with the GaOx layers and investigate the degradation of fluorescence under ambient conditions. We estimated the upper limit of oxygen and water permeation rate of 0.06 molecules/day, this complies with the industrial requirements onto permeation barriers. Similar to other highly functional materials like graphene ultrathin GaOx layers could also be used for prospective transparent barrier applications.