Building nanoplatelet alpha-MoO3 films: A high quality crystal anisotropic 2D material for integration Articles uri icon

authors

  • Nieto Pinero, E.
  • Negrete Aragon, S.
  • Muñoz Ochando, I.
  • GALIANA BLANCO, BEATRIZ
  • Pelaez, R. J.
  • Mate, B.
  • Lopez Andres, S.
  • Serna, R.

publication date

  • November 2024

start page

  • 1

end page

  • 9

volume

  • 672

International Standard Serial Number (ISSN)

  • 0169-4332

Electronic International Standard Serial Number (EISSN)

  • 1873-5584

abstract

  • The successful development of nanoplatelet α-MoO3 − films with wavelength-dependent in-plane and out-ofplane birefringence both in the visible and in the medium infrared is demonstrated. The films are prepared by
    a two-step process starting from structurally amorphous and continuous substoichiometric MoO3-X followed by
    isothermal annealing at low temperature (250 ◦C) to yield the formation of a dense network of large α-MoO3 2D
    nanoplatelets lying in-plane with no overlapping. These α-MoO3 crystals form a film with excellent thickness
    uniformity (20 nm) and are oriented with the [010] crystallographic direction parallel to the substrate normal.
    Finally, we report the film anisotropic optical complex refractive index, both parallel and perpendicular to the
    plane the full spectral range from 0.7 to 5 eV as determined by spectroscopic ellipsometry, and their characteristic in-plane phonon mode in the IR from FTIR measurements. These results show a promising pathway to the
    creation of highly functional anisotropic α-MoO3 2D films suitable for the development of integrated nanostructured photonic components.

subjects

  • Geology
  • Physics

keywords

  • oxides; 2d moo3; nanostructures; thin-films; ellipsometry; anisotropic properties; optical properties; pulsed laser deposition