[institut] Center for Solid State Physics and New Materials Seminar: Bojana Visic , 10. 10. 2025. at 12h

[Nenad Lazarevic]

Dear colleagues,

You are kindly invited to the Center for Solid State Physics and New
Materials seminar, which will be held on Friday, 10. 10. 2025. at 12:00,
in the "Dragan Popović" lecture hall of the Institute of Physics
Belgrade. The talk entitled:
Van der Waals nanotubes- from synthesis to applications will be given by
Dr. Bojana Višić. 
The abstract of the talk:
Semiconducting transition metal dichalcogenides (TMDCs) can be
synthesized in a wide range of structures and geometries, including
closed cage nanostructures, such as nanotubes (NTs) or fullerene-like
nanoparticles.  Individual multiwalled WS2 and MoS2 NTs are having a
resurgence of interest, as interesting optical and electrical properties
have been reported in recent years [1,2].  They are especially
intriguing due to their stability, enhanced light-matter interactions,
and ability to sustain exciton-polaritons in ambient conditions, i.e.,
strong coupling of excitonic resonances to the optical cavity.  Namely,
these nanotubes act as quasi-1D polaritonic nanosystems and sustain both
excitonic features and cavity modes in the visible-near infrared range.
This ability to confine light to subwavelength dimensions under ambient
conditions is induced by the high refractive index of WS2. 

On the other hand, NTs have been vastly neglected as possible alloyed
TMDC. Most of the research so far, both theoretically and
experimentally, focused on flat, two-dimensional structures, with only a
few reports that focused on non-carbon-based alloyed NTs [3].
Additionally, TMDCs have opened a new frontier in the area of field
emission devices, due to their layered structure and the presence of
thin and sharp edges with high aspect ratios which enhance the local
electric field.  We grew highly crystalline multiwalled Mo1-xWxS2 NTs
via the chemical vapour transport method, with the molybdenum and
tungsten atoms randomly distributed within the crystal structure [4]. A
detailed analysis of the ED patterns from an eight-layer nanotube
revealed that they grow in the 2H structure, with each shell consisting
of one bilayer. The work function of the NTs is comparable than that of
pure MoS2 and lower of pure WS2 NTs, making them ideal candidates for
field emission applications.  

Various TMDC NTs promise a wide spectrum of physical effects beyond the
physics of CNTs [2]. They have a high aspect ratio, high specific
surface area and excellent mechanical and vibrational/acoustic
properties, making them suitable as composite nanofillers as only a
small amount can be used  for forming a conductive path [5].
Furthermore, MS2 NTs disperse well in all commonly used solvents,
simplifying composite preparation [6]. 

 	* B. Višić, et al., _Phys. Rev. Res_. 1 3 (2019).
 	* B. Višić, et al., _JACS_ 139 12865-78 (2017).
 	* M. B. Sreedhara, et al., _J Am Chem Soc_ 144 232 (2022).
 	* L. Pirker, et al., _Adv. Funct. Mater_ 33 15 (2023).
 	* R. Evarestov, et al., _Materials Research Express 5_ 115028 (2018).
 	* L. Yadgarov, et al., _Physical Chemistry Chemical Physics_ 20
20812-20 (2018).

Best Regards,
Nenad Lazarevic

-- 
Center for Solid State Physics and New Materials,
Institute of Physics Belgrade
Pregrevica 118, 11080 Belgrade, Serbia
http://www.ipb.ac.rs/
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