期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 401, 期 -, 页码 495-505出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2015.10.072
关键词
EPR; Nanoparticle; Anatase; Rutile; TiO2; Fe3+ ion
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) [A4485]
- ACERT grant: NIH/NIGMS [P41GM103521]
- Kazan Federal University, Russia
Detailed EPR investigations on as-grown and annealed TiO2 nanoparticles in the anatase and rutile phases were carried out at X-band (9.6 GHz) at 77, 120-300 K and at 236 GHz at 292 K. The analysis of EPR data for as-grown and annealed anatase and rutile samples revealed the presence of several paramagnetic centers: Ti3+, O-, adsorbed oxygen (O-2(-)) and oxygen vacancies. On the other hand, in asgrown rutile samples, there were observed EPR lines due to adsorbed oxygen (O-2(-)) and the Fe3+ ions in both Ti4+ substitutional positions, with and without coupling to an oxygen vacancy in the near neighborhood. Anatase nanoparticles were completely converted to rutile phase when annealed at 1000 degrees C, exhibiting EPR spectra similar to those exhibited by the as-grown rutile nanoparticles. The high-frequency (236 GHz) EPR data on anatase and rutile samples, recorded in the region about g=2.0 exhibit resolved EPR lines, due to O and O-2 ions enabling determination of their g-values with higher precision, as well as observation of hyperfine sextets due to Mn2+ and Mn4+ ions in anatase. (C) 2015 Elsevier B.V. All rights reserved.
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