Abstract
Electrospun TiO2 nanofibers were implanted with aluminum ions, and their crystallization kinetics, phase transformations, and activation energies were investigated from 25 to 900 °C by in situ high-temperature synchrotron radiation diffraction. The amorphous non-implanted and Al ion-implanted TiO2 nanofibers transformed to crystalline anatase at 600 °C and to rutile at 700 °C. The TiO2 phase transformation of the Al ion-implanted material was accelerated relative to non-implanted sample. Compared with non-implanted nanofibers, the Al-implanted materials yielded a decreased activation energies from 69(17) to 29(2) kJ/mol for amorphous-to-anatase transformation and from 112(15) to 129(5) kJ/mol for anatase-to-rutile transformation. A substitution of smaller Al ions for Ti in the TiO2 crystal structure results in accelerated titania phase transformation and a concomitant reduction in the activation energies.
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Acknowledgements
The authors acknowledge financial support from the Australian Synchrotron (Powder Diffraction Beamline) (AS122/PDFI/5075) and the Australian Institute of Nuclear Science and Engineering (ALNGRA11135). The authors would like to thank E/Prof. B. O’Connor for critical discussions on the data analysis; Dr. Y. Dong for use of the electrospinning machine; Ms. E. Miller for assistance with SEM imaging; Dr. X. Wang for assistance with TEM; Dr. J. Kimpton at the Australian Synchrotron for advice on the use of instrumentation at powder diffraction beamline; and Dr. M. Ionescu of the Australian Nuclear Science and Technology Organization for helpful assistance with ion implantation, SRIM simulation, and the analysis of RBS results.
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Albetran, H., Low, I.M. Crystallization kinetics and phase transformations in aluminum ion-implanted electrospun TiO2 nanofibers. Appl. Phys. A 122, 1044 (2016). https://doi.org/10.1007/s00339-016-0568-8
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DOI: https://doi.org/10.1007/s00339-016-0568-8