Synthesis of lustering two-dimensional α-MoO3 van der Waals crystals by TiO2 assisted selective facet passivation

Sang Hwa Moon, Min Jin Kim, Sang Hyuk Im

Research output: Contribution to journalArticle

Abstract

Large-sized α-MoO3 nanoplates with 10−100 μm were synthesized by introduction of titanium tetra isopropoxide as TiO2 precursor in hydrothermal solution chemistry. During the hydrothermal synthesis, the TiO2 can be selectively deposited on the (001) facets of h-MoO3 hexagonal rods and on the (001) and/or (010) facet of α-MoO3 re-growing crystals due to the small lattice mismatch between them. Owing to the TiO2 passivation of the surface of h-MoO3 rods, the h-MoO3 rods are changed to MoO3 tubes because the h-MoO3 are dissolved from the inner part of the TiO2 passivated h-MoO3 rods. The TiO2-passivated (001) facets of h-MoO3 rods act as templates for the re-growth of α-MoO3 and consequently produced rectangle-shaped α-MoO3 nanoplates. Simultaneously, the TiO2 passivated on the (001) and/or (010) facet of the re-growing α-MoO3 crystals inhibits the preferred crystal growth to [001] direction and promoted the crystal growth to [100] direction, thereby yielding plate-shaped α-MoO3. The small α-MoO3 nanoplates and rectangle-shaped ones are further grown to larger nanoplates by attachment process and/or continuous growth.

Original languageEnglish
JournalJournal of Industrial and Engineering Chemistry
DOIs
Publication statusAccepted/In press - 2020 Jan 1

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Keywords

  • Facet passivation
  • Lustering effect pigments
  • Molybdenum trioxide
  • Nanoplates
  • van der Waals crystals

ASJC Scopus subject areas

  • Chemical Engineering(all)

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