Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Focus: Molecularly Functionalized Low-Dimensional Systems I - organized by Antonio Setaro, Carola Meyer, Aravind Vijayaraghvan and Matteo Mannini
CPP 1.2: Vortrag
Montag, 12. März 2018, 10:00–10:15, C 130
Encapsulation of molecules into carbon and boron nitride nanotubes - a comparison — •Katalin Kamarás1, Áron Pekker1, Dániel Datz1, Hajnalka M. Tóháti1, Kate E. Walker2, Graham A. Rance2, and Andrei N. Khlobystov2 — 1Wigner Research Centre for Physics, Budapest, Hungary — 2University of Nottingham, Nottingham, United Kingdom
Encapsulation of small molecules into carbon nanotubes enables the study of special one-dimensional structures as well as chemical reactions in the cavities. We compare encapsulated structures using two kinds of nanotubes: carbon, with an extended π-electron system, and boron nitride, an analogue of carbon nanotubes with a predominantly ionic bonding. The different electronic structures give rise to different behavior in many aspects. Van der Waals interaction between the tube wall and the encapsulated molecule is much weaker in boron nitride, therefore the filling is easily reversible by solvent extraction. Boron nitride being transparent in most of the infrared and visible region, reactions within the tube can be followed by spectroscopy. On the other hand, the strong phonon-polariton mode and the local infrared-active defect modes can be detected by near-field spectroscopy, making it possible to map the defect structure with spatial resolution of the order of a few tens of nanometers. By thermal reactions, different kinds of double-walled nanotubes are produced, including "shielded nanocables" of carbon nanotubes inside boron nitride nanotubes.