Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Exfoliation of Dion-Jacobson Layered Perovskite into Macromolecular Nanoplatelet

  • Lee, Won-Jae (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University) ;
  • Yeo, Hyun Jung (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University) ;
  • Kim, Do-Yun (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University) ;
  • Paek, Seung-Min (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University) ;
  • Kim, Young-Il (Department of Chemistry, Yeungnam University)
  • Received : 2013.03.19
  • Accepted : 2013.04.10
  • Published : 2013.07.20
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Abstract

A layered perovskite of Dion-Jacobson phase, $RbLaTa_2O_7$, was successfully exfoliated into colloidal suspension via successive ion-exchange and intercalation reaction. The pristine perovskite $RbLaTa_2O_7$ was synthesized by conventional solid-state reaction, and then, it was ion-exchanged with hydrochloric acid to obtain a protonic form of perovskite. The resulting proton-exchanged perovskite was reacted with ethylamine to increase interlayer spaces for further intercalation reaction. Finally, the ethylamine-intercalated form was exfoliated into nanosheets via an intercalation of bulky organic cations (tetrabutylammonium). According to X-ray diffraction (XRD) analysis, the TBA-intercalated form showed remarkably increased interlayer spacing (${\Delta}d$ = 1.67 nm) in comparison with that of the pristine material. Transmission electron microscopic image of exfoliated perovskite clearly revealed that the present exfoliated perovskite were composed of very thin layers. This exfoliated perovskite nanosheets could be applicable as building blocks for fabricating functional nanocomposites.

Keywords

References

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