Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.33: Poster

Dienstag, 21. März 2017, 18:30–20:30, P4

in-situ TEM observations of motions of nanostructures entrapped in carbon nanotubekecheng cao1, johannes biskupek1, thilo zoberbier1, thomas w. chamberlain2, andrei n. khlobystov2, and •ute kaiser11Central Facility for Electron Microscopy, Ulm University, Ulm, Germany — 2School of Chemistry, University of Nottingham, Nottingham, UK

Single-walled carbon nanotubes (SWNTs) are promising materials to realize the controllable transport of molecules due to their narrow cylindrical cavities. Time-resolved in-situ transmission electron microscopy (TEM) imaging with an atomic resolution enables direct visualization of molecular motion in SWNTs. The back and forth translations of a carbon capsule, LaC2 nanocrystal, C60 molecules in SWNTs have been subsequently reported. However, the driving mechanism of these motions is still unknown.

In this study we follow translational motion of different types of nanoparticles investigated by means of 30 and 80 kV time-resolved in-situ TEM in order to deduce the driving force of the motion. Prior to electron beam irradiation, the SWNTs were filled with Fe3(CO)12 molecules, which then converted into α-Fe nanoparticles and Fe compounds with amorphous carbon in the lumen of SWNTs.The reciprocating motions of Fe nanoparticles were observed and recorded. We demonstrated the electrostatic repulsion due to ionization of the nanoparticles by the electron beam as the most likely force propelling the nanoparticles in their translational motion.

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DPG-Physik > DPG-Verhandlungen > 2017 > Dresden