[1. Kim, D. H., Yang, J. S., Lee, K. W., Bu, S. D., Noh, T. W., Oh, S.-J., Kim, Y. -W., Chung, J. -S., Tanaka, H., Lee, H. Y., & Kawai, T. (2002). Formation of Co nanoclusters in epitaxial Ti0.96Co0.04O2 thin films and their ferromagnetism. Appl. Phys. Lett., 81, 2421–2423.10.1063/1.1509477]Search in Google Scholar
[2. Punnoose, A., Seehra, M. S., Park, W. K., & Moodera, J. S. (2003). On the room temperature ferromagnetism in Co-doped TiO2 films. J. Appl. Phys., 93, 7867–7869.10.1063/1.1556121]Search in Google Scholar
[3. Santara, B., Pal, B., & Giri, P. K. (2011). Signature of strong ferromagnetism and optical properties of Co doped TiO2 nanoparticles. J. Appl. Phys., 110, 114322.10.1063/1.3665883]Search in Google Scholar
[4. Hong, N. H., Sakai, J., Prellier, W., Hassini, A., Ruyter, A., & Gervais, F. (2004). Ferromagnetism in transition-metal-doped TiO2 thin films. Phys. Rev. B, 70, 195204.]Search in Google Scholar
[5. Griffin, K. A., Pakhomov, A. B., Wang, C. M., Heald, S. M., & Krishnan Kannan, M. (2005). Intrinsic ferromagnetism in insulating cobalt doped anatase TiO2. Phys. Rev. Lett., 94, 157204.]Search in Google Scholar
[6. Sangaletti, L., Mozzati, M. C., Galinetto, P., Azzoni, C. B., Speghini, A., Bettinelli, M., & Calestani, G. (2006). Ferromagnetism on a paramagnetic host background: the case of rutile TM:TiO2 single crystals (TM = Cr, Mn, Fe, Co, Ni, Cu). J. Phys.-Condens. Matter, 18, 7643–7650.10.1088/0953-8984/18/32/01221690876]Search in Google Scholar
[7. Nefedov, A., Akdogan, N., Zabel, H., Khaibullin, R. I., & Tagirov, L. R. (2006). Spin polarization of oxygen atoms in ferromagnetic Co-doped rutile TiO2. Appl. Phys. Lett., 89, 182509.10.1063/1.2378398]Search in Google Scholar
[8. Park, Y. R., Choi, S., Lee, J. H., Kim, K. J., & Kim, C. S. (2007). Ferromagnetic properties of Ni-doped rutile TiO2−δ. J. Korean Phys. Soc., 50, 638–642.10.3938/jkps.50.638]Search in Google Scholar
[9. Kim, D., Hong, J., Park, Y. R., & Kim, K. J., (2009). The origin of oxygen vacancy induced ferromagnetism in undoped TiO2. J. Phys.-Condens. Matter, 21, 195405(4pp.).10.1088/0953-8984/21/19/19540521825483]Search in Google Scholar
[10. Li, H., Liu, M., Zeng, Y., & Huang, T. (2010). Coexistence of antiferromagnetic and ferromagnetic in Mn-doped anatase TiO2 nanowires. J. Cent. South Univ., 17, 239–243.10.1007/s11771-010-0037-z]Search in Google Scholar
[11. Green, I. X., Tang, W., Neurock, M., & Yates, J. T. Jr (2011). Spectroscopic observation of dual catalytic sites during oxidation of CO on a Au/TiO2 catalyst. Science, 333, 736–739.10.1126/science.120727221817048]Search in Google Scholar
[12. Mudarra Navarro, A. M., Bilovol, V., Cabrera, A. F., & Rodriguez Torres, C. E. (2012). Relationship between structural and magnetic properties in (Ti,Fe) O2 powders obtained by mechanical milling. Physica B, 407, 3225–3228.10.1016/j.physb.2011.12.072]Search in Google Scholar
[13. Zhao, Y. L., Motapothula, M., Yakovlev, N. L., Liu, Z. Q., Dhar, S., Rusydi, A., Ariando, Breese, M. B. H., Wang, Q., & Venkatesan, T. (2012). Reversible ferromagnetism in rutile TiO2 single crystals induced by nickel impurities. Appl. Phys. Lett., 101, 142105.10.1063/1.4756799]Search in Google Scholar
[14. Parras, M., Varela, A., Cortes-Gil, R., Boulahya, K., Hernando, A., & Gonzales-Calbet, J. M. (2013). Room-temperature ferromagnetism in reduced rutile TiO2−δ nanoparticles. J. Phys. Chem. Lett., 4, 2171–2176.10.1021/jz401115q]Search in Google Scholar
[15. Nakai, I., Sasano, M., Inui, K., Korekawa, T., Ishijima, H., Katoh, H., Li, Y. J., & Kurisu, M. (2013). Oxygen vacancy and magnetism of a room temperature ferromagnet Co-doped TiO2. J. Korean Phys. Soc., 63, 532–537.10.3938/jkps.63.532]Search in Google Scholar
[16. Choudhury, B., & Choudhury, A. (2013). Structural, optical and ferromagnetic properties of Cr doped TiO2 nanoparticles. Mater. Sci. Eng. B, 178, 794–800.10.1016/j.mseb.2013.03.016]Search in Google Scholar
[17. Santara, B., Giri, P. K., Dhara, S., Imakita, K., & Fuji, M. (2014). Oxygen vacancy-mediated enhanced ferromagnetism in undoped and Fe-doped TiO2 nanoribbons. J. Phys. D-Appl. Phys., 47, 235304(14pp.).]Search in Google Scholar
[18. Dolat, D., Mozia, S., Ohtani, B., & Morawski, A. W. (2013). Nitrogen, iron-single modified (N-TiO2, Fe-TiO2) and co-modified (Fe,N-TiO2) rutile titanium dioxide as visible-light active photocatalysts. Chem. Eng. J., 225, 358–364.10.1016/j.cej.2013.03.047]Search in Google Scholar
[19. Guskos, N., Glenis, S., Zolnierkiewicz, G., Guskos, A., Typek, J., Berczynski, P., Dolat, D., Grzmil, B., Ohtani, B., & Morawski, A. W. (2014). Magnetic resonance study of co-modified (Fe,N)-TiO2. J. Alloy. Compd., 606, 32–36.10.1016/j.jallcom.2014.03.130]Search in Google Scholar
[20. Coronado, J. M., Maira, A. J., Conesa, J. C., Yeung, K. L., Augugliaro, V., & Soria, J. (2001). EPR study of the surface characteristics of nanostructured TiO2 under UV irradiation. Langmuir, 17, 5368–5374.10.1021/la010153f]Search in Google Scholar
[21. Mele, G., Del Sole, R., Vasapollo, G., Marci, G., Garcia-Lopez, E., Palmisano, L., Coronado, J. M., Hernandez-Alonso, M. D., Malitesta, C., & Guascito, M. R. (2005). TRMC, XPS, and EPR characterizations of polycrystalline TiO2 porphyrin impregnated powders and their catalytic activity for 4-nitrophenol photodegradation in aqueous suspension. J. Phys. Chem. B, 109, 12347–12352.10.1021/jp044253g16852524]Search in Google Scholar
[22. Yang, S., Halliburton, L. E., Manivannan, A., Bunton, P. H., Baker, D. B., Klemm, M., Horn, S., & Fujishima, A. (2009). Photoinduced electron paramagnetic resonance study of electron traps in TiO2 crystals: Oxygen vacancies and Ti3+ ions. Appl. Phys. Lett., 94, 162114(3pp.).10.1063/1.3124656]Search in Google Scholar
[23. Tian, B., Li, C., Gu, F., Jiang, H., Hu, Y., & Zhang, J. (2009). Flame sprayed V-doped TiO2 nanoparticles with enhanced photocatalytic activity under visible light irradiation. Chem. Eng. J., 151, 220–227.10.1016/j.cej.2009.02.030]Search in Google Scholar
[24. Brandao, F. D., Pinheiro, M. V. B., Ribeiro, G. M., Medeiros-Ribeiro, G., & Krambrock, K. (2009). Identification of two light-induced charge states of the oxygen vacancy in single-crystalline rutile TiO2. Phys. Rev. B, 80, 235204.]Search in Google Scholar
[25. Yang, S., Brant, A. T., & Halliburton, L. E. (2010). Photoinduced self-trapped hole center in TiO2 crystals. Phys. Rev. B, 82, 035209.]Search in Google Scholar
[26. Macdonald, I. R., Howe, R. F., Zhang, X., & Zhou, W. (2010). In situ EPR studies of electron trapping in a nanocrystalline rutile. J. Photochem. Photobiol. A-Chem., 216, 238–243.10.1016/j.jphotochem.2010.07.023]Search in Google Scholar
[27. Shkrob, I. A., Marin, T. W., Chemerisov, S. D., & Sewilla, M. D. (2011). Mechanistic aspects of photooxidation of polyhydroxylated molecules on metal oxides. J. Phys. Chem. C, 115, 4642–4648.10.1021/jp110612s308307521532934]Search in Google Scholar
[28. Guskos, N., Guskos, A., Typek, J., Berczynski, P., Dolat, D., Grzmil, B., & Morawski, A. (2012). Influence of annealing and rinsing on magnetic and photocatalytic properties of TiO2. Mater. Sci. Eng. B, 177, 223–227.10.1016/j.mseb.2011.10.017]Search in Google Scholar
[29. Guskos, N., Typek, J., Guskos, A., Berczynski, P., Dolat, D., Grzmil, B., & Morawski, A. (2013). Magnetic resonance study of annealed and rinsed N-doped TiO2 nanoparticles. Cent. Eur. J. Chem., 11, 1996–2004.10.2478/s11532-013-0340-2]Search in Google Scholar
[30. Guskos, N., Zolnierkiewicz, G., Guskos, A., Typek, J., Berczynski, P., Dolat, D., Mozia, S., & Morawski, A. W. (2015). Magnetic resonance study of nickel and nitrogen co-modified titanium dioxide nanocomposites. In NATO Science for Peace and Security Series – C: Environmental Security, “Nanotechnology in the security systems”, 29 September – 3 October 2013 (pp. 33–48). Dordrecht: Springer.]Search in Google Scholar
[31. Dolat, D., Mozia, S., Wrobel, R. J., Moszynski, D., Ohtani, B., Guskos, N., & Morawski, A. W. (2015). Nitrogen-doped, metal-modified rutile titanium dioxide as photocatalysts for water remediation. Appl. Catal. B-Environ., 162, 310–318.10.1016/j.apcatb.2014.07.001]Search in Google Scholar
[32. Guskos, N., Anagnostakis, E. A., Gasiorek, G., Typek, J., Bodzionny, T., Narkiewicz, U., Arabczyk, W., & Konicki, W. (2004). Magnetic resonance study of α-Fe and Fe3C nanoparticle agglomerates in a nonmagnetic matrix. Mol. Phys. Rep., 39, 58–65.]Search in Google Scholar
[33. Guskos, N., Typek, J., Maryniak, M., Narkiewicz, U., Kucharewicz, I., & Wrobel, R. (2005). FMR study of agglomerated nanoparticles in a Fe3C/C system. Materials Science-Poland, 23, 1001–1008.]Search in Google Scholar
[34. Helminiak, A., Arabczyk, W., Zolnierkiewicz, G., Guskos, N., & Typek, J. (2011). FMR study of the influence of carburization levels by methane decomposition on nanocrystalline iron. Rev. Adv. Mater. Sci., 29, 166–174.]Search in Google Scholar
[35. Kliava, J. (2009). Electron magnetic resonance of nanoparticles: Superparamagnetic resonance. In S. P. Gubin (Ed.), Magnetic nanoparticles (pp. 255–302). Wiley-VCH. Retrieved 15 September 2009, from http://onlinelibrary.wiley.com/book/10.1002/9783527627561.]Search in Google Scholar