Au Nanoparticles as Template for Defect Formation in Memristive SrTiO3 Thin Films
Peter Grünberg Institut 7 and JARA-FIT, Forschungszentrum Jülich, 52425 Jülich, Germany
Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany
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
We investigated the possibility of tuning the local switching properties of memristive crystalline SrTiO
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
single crystal substrates as a defect formation template for the subsequent growth of SrTiO
. We studied in detail the resulting microstructure and the local conducting and switching properties of the SrTiO
thin films. We revealed that the Au nanoparticles floated to the SrTiO
surface during growth, leaving behind a distorted thin film region in their vicinity. By employing conductive-tip atomic force microscopy, these distorted SrTiO
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.
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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.
Raab N, Schmidt DO, Du H, Kruth M, Simon U, Dittmann R. Au Nanoparticles as Template for Defect Formation in Memristive SrTiO3 Thin Films. Nanomaterials. 2018; 8(11):869.
Raab, Nicolas; Schmidt, Dirk O.; Du, Hongchu; Kruth, Maximilian; Simon, Ulrich; Dittmann, Regina. 2018. "Au Nanoparticles as Template for Defect Formation in Memristive SrTiO3 Thin Films." Nanomaterials 8, no. 11: 869.
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