Electron-induced Ti-rich surface segregation on SrTiO3 nanoparticles |
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Affiliation: | 1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA;2. Department of Functional Materials, University of Bayreuth, 95440 Bayreuth, Germany |
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Abstract: | Atomic surface structures of nanoparticles are of interest in catalysis and other fields. Aberration-corrected HREM facilitates direct imaging of the surfaces of nanoparticles. A remaining concern of surface imaging arises from beam damage. It is important to identify the intrinsic surface structures and the ones created by electron beam irradiation in TEM. In this study, we performed aberration-corrected HREM and EELS to demonstrate that TiO and bcc type Ti islands form due to intense electron irradiation. The formation of Ti-rich islands is in agreement with previous high temperature annealing experiments on the surfaces of SrTiO3 single crystals. |
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Keywords: | Beam damage HREM Surface structure Simulation Strontium titanate Nanoparticles |
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