Dresden 2006 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 1: Optical properties of thin films I

DS 1.3: Vortrag

Montag, 27. März 2006, 10:00–10:15, GER 37

Optical properties of noble metal alloy nanocomposites prepared by vapor phase co-deposition. — •Haile Takele, Venkata Sai Kiran Chakravadhanula, Henry Greve, Vladmir Zaporjtchenko, and Franz Faupel — Lehrstuhl für Materialverbunde, Technische Fakultät der CAU Kiel, Kaiserstr. 2, 24143 Kiel, Germany.

Ag-Au and Ag-Cu nanoparticles have been prepared in a Teflon AF matrixes, by co-deposition of the components from three different evaporators in a high vacuum. The microstructure of the nanocomposites, alloy formation, and there optical properties were investigated by using TEM, XRD, and UV-Visble spectroscopy, respectively. A complete alloy formation of Ag-Au nanoparticles in a Teflon AF matrix provides a single surface plasmon resonance (SPR) that allows tuning over a large range of the visible spectrum. The resonance wavelength of Ag-Au alloy nanocomposites were defined by varying the ratio of the Ag and Au volume fraction at a constant metal volume fraction in the composites. Moreover, multiple resonance wavelengths were observed from immiscible elements of Ag-Cu alloy nanoparticles in a Teflon matrix. The effect of substrate temperature during deposition and post deposition annealing on the alloy formation and nanocomposite morphology were studied as well.