Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 3: 2D Materials: Session I (joint session DS/CPP/HL)
HL 3.4: Talk
Monday, March 12, 2018, 10:15–10:30, H 2032
Raman spectroscopy of misfit layer compound nanotubes from CrS2 and TaS2 — •Felix Kampmann1,2, Dalit Stolovas3, Leela S. Panchakarla3, Gal Radovsky3, Christian Thomsen2, Reshef Tenne3, and Janina Maultzsch2 — 1Institut für Festkörperphysik, TU Berlin, Berlin, Germany — 2Institut für Physik der Kondensierten Materie, FAU Erlangen-Nürnberg, 91058 Erlangen, Germany — 3Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, Israel
Misfit layer compounds (MLC) offer an interesting approach towards synthesis of novel one-dimensional nanostructures and two-dimensional materials. Understanding their structure and their physical properties has been subject to intense scientific research. The MLCs described by the formula MX-TX2 consist of a transition metal dichalcogenide (TMD) layer TX2 and an intercalation layer MX with distorted rocksalt structure. Here M denotes a metal, X is one of the elements S or Se, and T is of the group of transition metals.
In our study the TMD layer CrS2 or TaS2 is intercalated by either LaS-, CeS- or GdS- layers. Upon formation of the MLC charge transfer between the sublayers and deformation of the intercalation layer stabilize the otherwise metastable CrS2. Due to the misfit between the sublayers in at least one direction and the seaming of dangling bonds at the rim atoms, the synthesis of nanotubes and -scrolls is favored. We investigate the vibrational properties of MLC nanotubes via Raman spectroscopy and discuss the results regarding previously published TEM methods.