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[Fizinfo] Szemináriumok - Seminars: Datz Dániel

Chronological Thread 
  • From: Szeminárium koordinátor <sem-admin AT>
  • To: SZFI Szeminárium <seminar AT>,Fizinfo <fizinfo AT>
  • Cc: Fizinfo <fizinfo AT>
  • Subject: [Fizinfo] Szemináriumok - Seminars: Datz Dániel
  • Date: Thu, 28 Jan 2021 06:26:01 +0100 (CET)
  • Authentication-results: (amavisd-new); dkim=pass (1024-bit key) reason="pass (just generated, assumed good)"

SZFI SeminarDatz DánielWigner RCP SZFIPolaritonic enhancement in boron
nitride nanotubes measured by near-field infrared spectroscopyTuesday, 2
February 2021, 10:00, video conference, reactions in confined space,
especially inside nanotubes have been an exciting topic for many reasons: new
reaction pathways can be established resulting in unique products of specific
structure (regioselectivity) or electronic properties (electronic
selectivity), leading to various applications such as gas storage, catalysis
and battery electrodes. However, finding the characterization methods to
follow these reactions on the nanoscale remains a serious challenge. We
demonstrate the possibility to investigate the products of chemical reactions
between encapsulated molecules in nano-sized cavities in boron nitride
nanotubes (BNNTs) in-situ with 20 nm spatial resolution. This small-scale
investigation allows us to study the correlation of chemical reactivity with
topology or other variables in the local environment. Scattering type
near-field spectroscopy has been extensively applied to analyze collective
optical properties of materials at the nanoscale. However, the near-field
optical properties of the vibrational modes of small molecules were only
recognizable in close proximity to a metallic resonator. We show that phonon
polaritons of boron nitride nanotubes enhance the near-field vibrational
spectra of molecules in close proximity of the surface. By encapsulating C60
fullerene in BNNTs, we can reach a sensitivity level of a few hundred
molecules. Furthermore, we show by the photopolymerization of C60 that
products of chemical reactions inside the tubes can be identified, so long as
their vibrational signatures lie in the polariton gap of the BNNT. The
theoretical description of the scattering process is also being formulated
based on the extension of the Mie scattering formalism. In this formalism,
the electric field is expanded in the linear combination of spherical
harmonics centered around the scattering particles. Reflection from surfaces
and multiple scattering centers can also be handled, thus enabling the
calculation of the backscattered electric field in the SNOM
setup.&nbsp;Minden érdeklődőt szívesen látunk! - Everyone is welcome to
attend.Róbert Juhászsem-admin AT

  • [Fizinfo] Szemináriumok - Seminars: Datz Dániel, Szeminárium koordinátor, 01/28/2021

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