Abstract
We report on attempts towards the synthesis of titanium nanoparticles using a wet chemical approach in imidazolium-based ionic liquids (ILs) under reducing conditions. Transmission electron microscopy finds nanoparticles in all cases. UV/Vis spectroscopy confirms the nanoparticulate nature of the precipitate, as in all cases an absorption band between ca. 280 and 300 nm is visible. IR spectroscopy shows that even after extensive washing and drying, some IL remains adsorbed on the nanoparticles. Raman spectroscopy suggests the formation of anatase nanoparticles, but X-ray diffraction reveals that, possibly, amorphous titania forms or that the nanoparticles are so small that a clear structure assignment is not possible. The report thus shows that (possibly amorphous) titanium oxides even form under reducing conditions and that the chemical synthesis of titanium nanoparticles in ILs remains elusive.
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Acknowledgments
We thank H. Runge and R. Pitschke for SEM and TEM measurements, Prof. H.-J. Holdt and Dr. K. Tauer for access to their spectrometers, and I. Zenke for help with XRD. A. A. Ayi acknowledges the DAAD for a research fellowship and the University of Calabar for a research leave. Further funding from the University of Potsdam and the MPI of Colloids and Interfaces (Colloid Chemistry Department) is gratefully acknowledged.
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Ayi, A.A., Khare, V., Strauch, P. et al. On the chemical synthesis of titanium nanoparticles from ionic liquids. Monatsh Chem 141, 1273–1278 (2010). https://doi.org/10.1007/s00706-010-0403-4
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DOI: https://doi.org/10.1007/s00706-010-0403-4