Abstract
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.
Highlights
We present the analysis of a family of nanotubes (NTs) based on the quaternary misfit layered compound (MLC) YxLa1−xS-TaS2
The NTs are synthesized by chemical vapor transport (CVT) and are analyzed by electron microscopy and spectroscopy as well as Raman and Fourier transform infrared (FTIR) measurements
Www.acsnano.org selection of scanning electron microscopy (SEM) images of all investigated samples can be found in Figure S1, clearly revealing the successful synthesis of NTs for all values of x
Summary
We present the analysis of a family of nanotubes (NTs) based on the quaternary misfit layered compound (MLC) YxLa1−xS-TaS2. The gradual exchange of La by Y provides a pathway for fine control of the MLC structure, the degree of charge transfer from the MX slab to the TX2 layer, and the vibrational properties of the MX subunit These chemical and structural variations serve as a gauge of the free carrier density in the semimetallic TaS2 layer and a tool for controlling the plasmonic wavelength of the 1D MLC nanostructures in the infrared (IR) range. This property may have relevance to future plasmonic technology in the IR range. The charge capacity of the TaS2 layer is not sufficient for the full charge transfer from the ScxLa1−xS layer, inhibiting the formation of a stable MLC lattice in this case
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