Special Section on Nanocarbon Photonics and Optoelectronics

Paramagnetic anatase titania/carbon nanocomposites

[+] Author Affiliations
Ivan Zakharchuk, Anton A. Komlev, Ekaterina Soboleva, Erkki Lähderanta

Lappeenranta University of Technology, Laboratory of Physics, School of Engineering Science, Lappeenranta, Finland

Tatiana L. Makarova

Lappeenranta University of Technology, Laboratory of Physics, School of Engineering Science, Lappeenranta, Finland

Ioffe Physical Technical Institute, Laboratory of Nonequilibrium Processes in Semiconductors, Division of Solid State Electronics, St. Petersburg, Russia

Dmitry A. Zherebtsov, Damir M. Galimov

South Ural State University, Education and Research Center for Nanotechnology, Chelyabinsk, Russia

J. Nanophoton. 11(3), 032505 (Feb 06, 2017). doi:10.1117/1.JNP.11.032505
History: Received November 1, 2016; Accepted January 20, 2017
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Abstract.  The nanocomposites comprising of anatase titania nanoparticles uniformly distributed inside the porous carbon matrix were synthesized using furfuryl alcohol, tetrabutyltitanate, and nonionic surfactant. The characterization of the nanocomposite by scanning electron microscopy, transmission electron microscopy, energy dispersive x-ray analysis, x-ray diffractometry, and Raman spectroscopy revealed the formation of anatase titania nanoparticles of average sizes 10 to 20 nm. The observed broadening and blueshift of the main Raman peak of titanium dioxide nanoparticles were explained using the phonon confinement effect. The nanocomposite exhibited strong paramagnetism at low temperatures and was diamagnetic at higher temperatures, as well as a small contamination by magnetic impurities was detected. The paramagnetism originated from the amorphous defect-rich carbon and oxygen vacancies in titania.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Ivan Zakharchuk ; Anton A. Komlev ; Ekaterina Soboleva ; Tatiana L. Makarova ; Dmitry A. Zherebtsov, et al.
"Paramagnetic anatase titania/carbon nanocomposites", J. Nanophoton. 11(3), 032505 (Feb 06, 2017). ; http://dx.doi.org/10.1117/1.JNP.11.032505


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