Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Hyperpolarized 129 NMR Study of TiO2 Nanotubes

  • Lee, Sang-Man (Department of Chemistry, Pohang University of Science and Technology) ;
  • Lee, Soon-Chang (Energy & Applied Nano Material Research Team, Korea Basic Science Institute) ;
  • Mehrotra, Vandana (Department of Chemistry, Pohang University of Science and Technology) ;
  • Kim, Hae-Jin (Energy & Applied Nano Material Research Team, Korea Basic Science Institute) ;
  • Lee, Hee-Cheon (Department of Chemistry, Pohang University of Science and Technology)
  • Received : 2011.11.19
  • Accepted : 2011.12.07
  • Published : 2012.02.20
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Abstract

A continuous flow hyperpolarized (HP) $^{129}Xe$ NMR spectroscopy was employed for the first time to investigate $TiO_2$ nanotubes (Ti-NTs) synthesized from commercial nanoparticles with different reaction times. A single peak attributing to channels for Ti-NTs was observed for variable temperature HP $^{129}Xe$ NMR spectra. It was also noted that there is alteration in value for heat of adsorption, ${\Delta}H$ from $12.6{\pm}1.3$ to $16.4{\pm}0.4kJ/mol$ and variation in chemical shift of the xenon adsorbed in channels, ${\delta}_s$ from $120{\pm}2\sim135{\pm}9ppm$ which were closely correlated to channel length and it was shown that P25-24 Ti-NTs with longest channel is most favorite Ti-NTs for Xe adsorption.

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