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
Affiliations
Tudor Braniste
National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova
Mircea Dragoman
National Institute for Research and Development in Microtechnologies (IMT Bucharest), Erou Iancu Nicolae Street 126A, 077190 Voluntari, Romania
Sergey Zhukov
Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (State University), 9 Institutskiy per., 141701 Dolgoprudny, Russia
Martino Aldrigo
National Institute for Research and Development in Microtechnologies (IMT Bucharest), Erou Iancu Nicolae Street 126A, 077190 Voluntari, Romania
Vladimir Ciobanu
National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova
Sergiu Iordanescu
National Institute for Research and Development in Microtechnologies (IMT Bucharest), Erou Iancu Nicolae Street 126A, 077190 Voluntari, Romania
Liudmila Alyabyeva
Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (State University), 9 Institutskiy per., 141701 Dolgoprudny, Russia
Francesco Fumagalli
European Commission, Joint Research Centre (JRC), Via E. Fermi, 2749, 21027 Ispra, Italy
Giacomo Ceccone
European Commission, Joint Research Centre (JRC), Via E. Fermi, 2749, 21027 Ispra, Italy
Simion Raevschi
Department of Physics and Engineering, State University of Moldova, Alexei Mateevici str. 60, 2009 Chisinau, Moldova
Fabian Schütt
Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143 Kiel, Germany
Rainer Adelung
Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143 Kiel, Germany
Pascal Colpo
European Commission, Joint Research Centre (JRC), Via E. Fermi, 2749, 21027 Ispra, Italy
Boris Gorshunov
Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (State University), 9 Institutskiy per., 141701 Dolgoprudny, Russia
Ion Tiginyanu
National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova
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.
