Nanomaterials (May 2020)

Aero-Ga<sub>2</sub>O<sub>3</sub> Nanomaterial Electromagnetically Transparent from Microwaves to Terahertz for Internet of Things Applications

  • Tudor Braniste,
  • Mircea Dragoman,
  • Sergey Zhukov,
  • Martino Aldrigo,
  • Vladimir Ciobanu,
  • Sergiu Iordanescu,
  • Liudmila Alyabyeva,
  • Francesco Fumagalli,
  • Giacomo Ceccone,
  • Simion Raevschi,
  • Fabian Schütt,
  • Rainer Adelung,
  • Pascal Colpo,
  • Boris Gorshunov,
  • Ion Tiginyanu

DOI
https://doi.org/10.3390/nano10061047
Journal volume & issue
Vol. 10, no. 6
p. 1047

Abstract

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In this paper, fabrication of a new material is reported, the so-called Aero-Ga2O3 or Aerogallox, which represents an ultra-porous and ultra-lightweight three-dimensional architecture made from interconnected microtubes of gallium oxide with nanometer thin walls. The material is fabricated using epitaxial growth of an ultrathin layer of gallium nitride on zinc oxide microtetrapods followed by decomposition of sacrificial ZnO and oxidation of GaN which according to the results of X-ray diffraction (XRD) and X-ray photoemission spectroscopy (XPS) characterizations, is transformed gradually in β-Ga2O3 with almost stoichiometric composition. The investigations show that the developed ultra-porous Aerogallox exhibits extremely low reflectivity and high transmissivity in an ultrabroadband electromagnetic spectrum ranging from X-band (8–12 GHz) to several terahertz which opens possibilities for quite new applications of gallium oxide, previously not anticipated.

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