Engineering crystalline Au nanoparticles of anisotropic shape in epitaxially grown high-index SrTiO3

in: Journal of Materials Science (2015)
Bernhardt, Henrik; Diener, R.; Katzer, Christian; Schmidl, Gabriele; Fritzsche, Wolfgang; Schmidl, Frank; Sungur, Pelin; Hübner, Uwe; Uschmann, Ingo
We present a possible fabrication scheme of anisotropic nanoparticles grown in a crystal high index material (SrTiO3). Different ellipsoidal Au nano-antennas were formed by changing the Au seed layer thickness and subsequent embedding in SrTiO3, prepared by pulsed laser deposition (PLD). Prior to the SrTiO3 deposition a temperature induced dewetting process of the thin Au films results in different particle sizes and size distributions, which are the basis for anisotropic particle formation after embedding in a crystalline SrTiO3 matrix. The dependence of the anisotropy on the Au seed layer thickness was investigated by x-ray diffraction (XRD) measurements. At this was noticed a stronger increase in size in c-axis direction than in a/b-axis direction for an increase of the Au seed layers. Additionally, the optical response of the particles was detected via the plasmon resonance shift in extinction and scattering spectra.

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