Allgemeines Physikalisches Kolloquium - WS 2013/14

Ort:	48149 Münster, Wilhelm-Klemm-Straße 10, IG 1, HS 2
Zeit:	Donnerstag, 31.10.2013, 16 Uhr c.t.
	Kolloquiums-Kaffe: ab 15:45 Uhr vor dem Hörsaal

functional nanocomposites - preparation and physical properties

Prof. Dr. F. Faupel, Institut für Materialwissenschaft, Lehrstuhl für Materialverbunde, Universität Kiel

Nanocomposite films consisting of metal nanoparticles in a dielectric matrix have unique functional properties with hosts of applications [1]. The present review demonstrates how vapor phase deposition techniques can be employed for tailoring the nanostructure and the resulting properties. Vapor phase deposition, inter alia, allows excellent control of the metallic filling factor and its depth profile as well as the incorporation of alloy nanoparticles with well-defined composition. The metallic nanoparticles typically form via a self-organization during co-deposition of the metallic and matrix components due to the high cohesive energy of the metals and the low metal-matrix interaction energy. Various methods such as sputtering, evaporation, and plasma polymerization have been applied for the deposition of the matrix component, while the metallic component has mostly been sputter-deposited or evaporated. Moreover, gas aggregation cluster sources were utilized to obtain independent control of filling factor and size of the embedded nanoparticles. Examples presented include optical composites with tuned particle surface plasmon resonances for plasmonic applications [2], magnetic high frequency materials with cut-off frequencies well above 1 GHz [3], sensors that are based on the dramatic change in the electronic properties near the percolation threshold [4], and antibacterial coatings which benefit from the large effective surface of nanoparticles and the increased chemical potential which both strongly enhance ion release [5].

Einladender: Prof. Dr. N.A. Stolwijk

Im Auftrag der Hochschullehrer des Fachbereichs Physik

Prof. Dr. N.A. Stolwijk