Nanotubes from the Misfit Layered Compound (SmS)1.19TaS2: Atomic Structure, Charge Transfer, and Electrical Properties
| Autor: | Sreedhara, M. B., Bukvi��ov��, Krist��na, Khadiev, Azat, Citterberg, Daniel, Cohen, Hagai, Balema, Viktor, K. Pathak, Arjun, Novikov, Dmitri, Leitus, Gregory, Kaplan-Ashiri, Ifat, Kol��bal, Miroslav, Enyashin, Andrey N., Houben, Lothar, Tenne, Reshef |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
CHARGE TRANSFER
COMPLEXES STRUCTURE RARE EARTHS ENERGY DISSIPATION ATOMS Condensed Matter::Materials Science Charge transfer ION BEAMS ELECTRON ENERGY LOSS SPECTROSCOPY X RAY PHOTOELECTRON SPECTROSCOPY DENSITY FUNCTIONAL THEORY METAL ATOMS Nanotubes 1-D STRUCTURES Lattices FREE CARRIERS PERFORMANCE HIGH RESOLUTION TRANSMISSION ELECTRON MICROSCOPY SUB-LAYERS RARE EARTH ATOMS X RAY ABSORPTION SPECTROSCOPY ddc:540 MISFIT-LAYERED COMPOUND MULTIWALLED CARBON NANOTUBES (MWCN) PROPERTY ELECTRON ENERGY LEVELS Layers ALLOYING ELEMENTS Sulfur SYNTHESISED |
| Zdroj: | Chem. Mater. Chemistry of Materials Chemistry of materials 34(4), 1838-1853 (2022). doi:10.1021/acs.chemmater.1c04106 |
| DOI: | 10.1021/acs.chemmater.1c04106 |
| Popis: | Chemistry of materials 34(4), 1838 - 1853 (2022). doi:10.1021/acs.chemmater.1c04106 Misfit layered compounds (MLCs) MX-TX$_2$, where M, T = metal atoms and X = S, Se, or Te, and their nanotubes are of significant interest due to their rich chemistry and unique quasi-1D structure. In particular, LnX-TX$_2$ (Ln = rare-earth atom) constitute a relatively large family of MLCs, from which nanotubes have been synthesized. The properties of MLCs can be tuned by the chemical and structural interplay between LnX and TX$_2$ sublayers and alloying of each of the Ln, T, and X elements. In order to engineer them to gain desirable performance, a detailed understanding of their complex structure is indispensable. MLC nanotubes are a relative newcomer and offer new opportunities. In particular, like WS$_2$ nanotubes before, the confinement of the free carriers in these quasi-1D nanostructures and their chiral nature offer intriguing physical behavior. High-resolution transmission electron microscopy in conjunction with a focused ion beam are engaged to study SmS-TaS$_2$ nanotubes and their cross-sections at the atomic scale. The atomic resolution images distinctly reveal that Ta is in trigonal prismatic coordination with S atoms in a hexagonal structure. Furthermore, the position of the sulfur atoms in both the SmS and the TaS$_2$ sublattices is revealed. X-ray photoelectron spectroscopy, electron energy loss spectroscopy, and X-ray absorption spectroscopy are carried out. These analyses conclude that charge transfer from the Sm to the Ta atoms leads to filling of the Ta 5d$_z$$^2$ level, which is confirmed by density functional theory (DFT) calculations. Transport measurements show that the nanotubes are semimetallic with resistivities in the range of 10$^{���4}$ ����cm at room temperature, and magnetic susceptibility measurements show a superconducting transition at 4 K. Published by American Chemical Society, Washington, DC |
| Databáze: | OpenAIRE |
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