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Issue 33, 2015
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Pressure-enhanced surface interactions between nano-TiO2 and ionic liquid mixtures probed by high pressure IR spectroscopy

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Abstract

The pressure-dependent interactions between the ionic liquid mixture ([MPI][I1.5]) and nano-TiO2 surfaces have been studied up to 2.5 GPa. The results of infrared spectroscopic profiles of [MPI][I1.5] and [MPI][I1.5]–nano-TiO2 indicated that no appreciable changes in the C–H stretching bands with the addition of nano-TiO2 were observed under ambient pressure. As the pressure was elevated to 0.7 GPa, the C–H stretching absorption of [MPI][I1.5] underwent band-narrowing and red-shifts in frequency. In contrast to the results of [MPI][I1.5], the spectra of [MPI][I1.5]–nano-TiO2 do not show dramatic changes under high pressures. A possible explanation for this observation is the formation of certain pressure-enhanced C–H⋯nano-TiO2 interactions around the imidazolium C–H and alkyl C–H groups. As imidazolium C–H⋯I is replaced by the weaker imidazolium C–H⋯polyiodide, the splitting of the imidazolium C–H stretching bands was observed. The experimental results indicate that both nano-TiO2 and polyiodides are capable of disturbing the self-assembly of ionic liquids. This study suggests the possibility to tune the efficiency of dye-sensitized solar cells via a high pressure method.

Graphical abstract: Pressure-enhanced surface interactions between nano-TiO2 and ionic liquid mixtures probed by high pressure IR spectroscopy

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Publication details

The article was received on 20 Oct 2014, accepted on 25 Nov 2014 and first published on 26 Nov 2014


Article type: Paper
DOI: 10.1039/C4CP04768K
Phys. Chem. Chem. Phys., 2015,17, 21143-21148

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    Pressure-enhanced surface interactions between nano-TiO2 and ionic liquid mixtures probed by high pressure IR spectroscopy

    H. Chang, J. Jiang, M. Kuo, D. Hsu and S. H. Lin, Phys. Chem. Chem. Phys., 2015, 17, 21143
    DOI: 10.1039/C4CP04768K

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