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

• Published in: Journal of materials science Vol. 50; no. 16; pp. 5562 - 5570
• Main Authors: Bernhardt, H., Diener, R., Sungur, P., Katzer, C., Schmidl, G., Hübner, U., Uschmann, I., Fritzsche, W., Schmidl, F.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2015; Springer Nature B.V
• Subjects: Anisotropy; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Copper; Crystal growth; Crystal structure; Crystallinity; Crystallography and Scattering Methods; Dependence; Drying; Embedding; Epitaxial growth; Gold; Materials Science; Nanoparticles; Original Paper; Polymer Sciences; Pulsed laser deposition; Pulsed lasers; Resonance scattering; Solid Mechanics; Strontium titanates; Thickness; Thin films; Optical Loss Spectrum; Dewetting Process; Localize Surface Plasmon Resonance; Seed Layer Thickness; Seed Layer
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-015-9103-0

We present a possible fabrication scheme of anisotropic nanoparticles grown in a crystal high-index material (SrTiO 3 ). Different ellipsoidal Au nano-antennas were formed by changing the Au seed layer thickness and subsequent embedding in SrTiO 3 , prepared by pulsed laser deposition. Prior to the SrTiO 3 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 SrTiO 3 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.