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

Abstract

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 temperatureinduced 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.

Optical characterization of YBa2Cu3O7− thin film modified gold nanoparticles

“…growth of the YBCO matrix. After heating the samples to 1050 K in an oxygen atmosphere of 50 Pa, a dewetting of the initial Au layers could be observed, leading to a self-organization of crystalline Au nanoparticles [16]. Apart from the Au film thickness, the dewetting process depends on the Au/substrate interfacial energies, partial pressure, temperature and time [17][18][19].…”

Au Nanoparticles as Template for Defect Formation in Memristive SrTiO3 Thin Films

“…Furthermore, AuNPs have been employed as defect formation centers to engineer the optical properties of SrTiO thin films [ 20 ]. In their work, a continuous Au layer was transformed into AuNPs by annealing-induced dewetting [ 21 ]. In this work, we employ chemically-synthesized AuNPs [ 22 ] as defect formation centers in SrTiO thin films.…”

Fabrication of self-assembled spherical Gold Particles by pulsed UV Laser Treatment

“…An intermediate route, similar to temperature dependent layer dewetting for NP manufacturing 15 – 17 , uses laser technologies based on energy transfer from laser pulses into a thin metal layer. Utilizing a laser for ablating a solid target or for heating or melting a layer by optical absorption extremely high energy is focused on and will be introduced into the metal.…”