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Strong Room-Temperature Ferromagnetism in Co2+-Doped TiO2 Made from Colloidal Nanocrystals
Open accessAbstract
Colloidal cobalt-doped TiO(2) (anatase) nanocrystals were synthesized and studied by electronic absorption, magnetic circular dichroism, transmission electron microscopy, magnetic susceptibility, cobalt K-shell X-ray absorption spectroscopy, and extended X-ray absorption fine structure measurements. The nanocrystals were paramagnetic when isolated by surface-passivating ligands, weakly ferromagnetic (M(s) approximately 1.5 x 10(-)(3) micro(B)/Co(2+) at 300 K) when aggregated, and strongly ferromagnetic (up to M(s) = 1.9 micro(B)/Co(2+) at 300 K) when spin-coated into nanocrystalline films. X-ray absorption data reveal that cobalt is in the Co(2+) oxidation state in all samples. In addition to providing strong experimental support for the existence of intrinsic ferromagnetism in cobalt-doped TiO(2), these results demonstrate the possibility of using colloidal TiO(2) diluted magnetic semiconductor nanocrystals as building blocks for assembly of ferromagnetic semiconductor nanostructures with potential spintronics applications.
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Cited by
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Chen, X., & Mao, S. S. (2007) · Chemical Reviews · doi:10.1021/cr0500535 · Cited by 10,688
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Bavykin, D. V., Friedrich, J. M., & Walsh, F. C. (2006) · Advanced Materials · doi:10.1002/adma.200502696 · Cited by 1,634
Nanomaterials for renewable energy production and storage
Chen, X., Li, C., Grätzel, M., Kostecki, R., & Mao, S. S. (2012) · Chemical Society Reviews · doi:10.1039/c2cs35230c · Cited by 1,015
Wang, S., Pan, L., Song, J.-J., Mi, W., Zou, J.-J., Wang, L., & Zhang, X. (2015) · Journal of the American Chemical Society · doi:10.1021/ja512047k · Cited by 718
Near Monodisperse TiO2 Nanoparticles and Nanorods
Li, X., Peng, Q., Yi, J., Wang, X., & Li, Y. (2006) · Chemistry – A European Journal · doi:10.1002/chem.200500893 · Cited by 175
Metadata
- Authors
- Bryan, J. D., Heald, S. M., Chambers, S. A., & Gamelin, D. R.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-08-24
- Volume
- 126
- Issue
- 37
- Pages
- 11640-11647
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2025416676
- Cited by
- 233
- References
- 0
- FWCI
- 10.42
- Type
- journal article
- Language
- en
- Open access
- green
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- Bryan, J. D., Heald, S. M., Chambers, S. A., & Gamelin, D. R. (2004). Strong Room-Temperature Ferromagnetism in Co2+-Doped TiO2 Made from Colloidal Nanocrystals. Journal of the American Chemical Society. https://doi.org/10.1021/ja047381r
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