YS-TaS 2 and Y x La 1– x S-TaS 2 (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

作者：Simón Hettler, M. B. Sreedhara, Marco Serra, Sudarson Sekhar Sinha, Ronit Popovitz‐Biro, Iddo Pinkas, Andrey N. Enyashin, Reshef Tenne, Raúl Arenal · 发表于：ACS Nano · 年份：2020 · DOI：10.1021/acsnano.9b09284 · 被引用次数：17 · 研究领域：2D Materials and Applications、MXene and MAX Phase Materials、Inorganic Chemistry and Materials

We present the analysis of a family of nanotubes (NTs) based on the quaternary misfit layered compound (MLC) YxLa1–xS-TaS2. The NTs were successfully synthesized within the whole range of possible compositions via the chemical vapor transport technique. In-depth analysis of the NTs using electron microscopy and spectroscopy proves the in-phase (partial) substitution of La by Y in the (La,Y)S subsystem and reveals structural changes compared to the previously reported LaS-TaS2 MLC-NTs. The observed structure can be linked to the slightly different lattice parameters of LaS and YS. Raman spectroscopy and infrared transmission measurements reveal the tunability of the plasmonic and vibrational properties. Density-functional theory calculations showed that the YxLa1–xS-TaS2 MLCs are stable in all compositions. Moreover, the calculations indicated that substitution of La by Sc atoms is electronically not favorable, which explains our failed attempt to synthesize these MLC and NTs thereof.