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Nanomaterials 2018, 8(11), 869; https://doi.org/10.3390/nano8110869

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

1
Peter Grünberg Institut 7 and JARA-FIT, Forschungszentrum Jülich, 52425 Jülich, Germany
2
Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany
3
Ernst Ruska-Center for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
*
Author to whom correspondence should be addressed.
Received: 13 September 2018 / Revised: 5 October 2018 / Accepted: 18 October 2018 / Published: 23 October 2018
(This article belongs to the Special Issue Nanoscale Surface Engineering)
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Abstract

We investigated the possibility of tuning the local switching properties of memristive crystalline SrTiO 3 thin films by inserting nanoscale defect nucleation centers. For that purpose, we employed chemically-synthesized Au nanoparticles deposited on 0.5 wt%-Nb-doped SrTiO 3 single crystal substrates as a defect formation template for the subsequent growth of SrTiO 3 . We studied in detail the resulting microstructure and the local conducting and switching properties of the SrTiO 3 thin films. We revealed that the Au nanoparticles floated to the SrTiO 3 surface during growth, leaving behind a distorted thin film region in their vicinity. By employing conductive-tip atomic force microscopy, these distorted SrTiO 3 regions are identified as sites of preferential resistive switching. These findings can be attributed to the enhanced oxygen exchange reaction at the surface in these defective regions. View Full-Text
Keywords: resistive switching; memristive devices; memristor; SrTiO3; Au nanoparticles resistive switching; memristive devices; memristor; SrTiO3; Au nanoparticles
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Raab, N.; Schmidt, D.O.; Du, H.; Kruth, M.; Simon, U.; Dittmann, R. Au Nanoparticles as Template for Defect Formation in Memristive SrTiO3 Thin Films. Nanomaterials 2018, 8, 869.

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