Publication date: 15th December 2025
The topic of inorganic nanotube synthesis and some selected applications will be elucidated in the series of research projects. The main emphasis will be on understanding the procedures connected to the high-temperature conversion of tungsten suboxide nanowhiskers to the WS2 multiwall nanotubes. The process was followed via in-situ and ex-situ scanning and transmission electron microscopies, respectively.1 The exact reaction mechanism was then revealed on the atomic and layer-by-layer scale. In a follow-up study, the synthetic nuances were exploited to reach the ultralong WS2 nanotubes with lengths reaching over half millimeters and on. Such unique materials promise opening new application playgrounds as demonstrated by assembling “WS2 inorganic bucky paper” – felt-like materials capable of ultrafiltration of gold nanoparticles.2
Another new application of WS2 nanotubes is the entrapment and encapsulation of uranium oxide within a nanotube lumen. The procedure is based on the facile melting of uranyl nitrate hydrate in the presence of WS2 nanotube powder. Chemical changes during the encapsulation were closely followed by XPS and XRD analyses. The procedure could be eventually exploited as a storage protocol for highly active and hazardous nuclear materials, including other isotopes capable of forming low melting salts.3
The final part of the talk will be focused on the description of the synthesis of advanced inorganic nanotubes, WTe2, MoTe2, ReSe2, and ReS2, utilizing Van der Waals epitaxy. The developed synthetic protocol exploits WS2 nanotubes as a useful substrate for the deposition of additional layers. New compounds deposited on the top of the nanotube copy the curvature of WS2 nanotubes, ultimately forming core-shell WS2 – MX2 nanotubular structures. This methodology allows the formation of unprecedented nanotubular structures, challenging for synthesis in the classical manner.4,5
(1) Kundrát, V.; Novák, L.; Bukvišová, K.; Zálešák, J.; Kolíbalová, E.; Rosentsveig, R.; Sreedhara, M. B.; Shalom, H.; Yadgarov, L.; Zak, A.; Kolíbal, M.; Tenne, R. Mechanism of WS 2 Nanotube Formation Revealed by in Situ / Ex Situ Imaging. ACS Nano 2024, 18 (19), 12284–12294. https://doi.org/10.1021/acsnano.4c01150.
(2) Kundrát, V.; Rosentsveig, R.; Bukvišová, K.; Citterberg, D.; Kolíbal, M.; Keren, S.; Pinkas, I.; Yaffe, O.; Zak, A.; Tenne, R. Submillimeter-Long WS 2 Nanotubes: The Pathway to Inorganic Buckypaper. Nano Lett. 2023, 23 (22), 10259–10266. https://doi.org/10.1021/acs.nanolett.3c02783.
(3) Kundrat, V.; Cohen, H.; Kossoy, A.; Bonani, W.; Houben, L.; Zalesak, J.; Wu, B.; Sofer, Z.; Popa, K.; Tenne, R. Encapsulation of Uranium Oxide in Multiwall WS 2 Nanotubes. Small 2023, 2307684. https://doi.org/10.1002/smll.202307684.
(4) Kundrat, V.; Houben, L.; Zalesak, J.; Pinkas, I.; Rosentsveig, R.; Tenne, R. Core-Shell Nanotubes from Tungsten/Molybdenum Ditelluride-Tungsten Disulfide via Van Der Waals Epitaxy. American Chemical Society (ACS) September 9, 2024. https://doi.org/10.26434/chemrxiv-2024-8zm9v.
(5) Koma, A. Van Der Waals Epitaxy—a New Epitaxial Growth Method for a Highly Lattice-Mismatched System. Thin Solid Films 1992, 216 (1), 72–76. https://doi.org/10.1016/0040-6090(92)90872-9.
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