Quaternary ChalCogenide-Based Misfit Nanotubes LnS(Se)-TaS(Se)(2) (Ln = La, Ce, Nd, and Ho): Synthesis and Atomic Structural Studies

Lajaunie, L. ; Radovsky, G. ; Tenne, R. ; Arenal, R. (Universidad de Zaragoza)

Resumen: We have synthesized quaternary chalcogenide-based misfit nanotubes LnS(Se)-TaS2(Se) (Ln = La, Ce, Nd, and Ho). None of the compounds described here were reported in the literature as a bulk compound. The characterization of these nanotubes, at the atomic level, has been developed via different transmission electron microscopy techniques, including high-resolution scanning transmission electron microscopy, electron diffraction, and electron energy-loss spectroscopy. In particular, quantification at sub-nanometer scale was achieved by acquiring high-quality electron energy-loss spectra at high energy (similar to between 1000 and 2500 eV). Remarkably, the sulfur was found to reside primarily in the distorted rocksalt LnS lattice, while the Se is associated-with the hexagonal TaSe2 site. Consequently, these quaternary misfit layered compounds in the form of nanostructures possess a double superstructure of La/Ta and S/Se with the same periodicity. In addition, the interlayer spacing between the layers and the interatomic distances within the layer vary systematically in the nanotubes, showing clear reduction when going from the lightest (La atom) to the heaviest (Ho) atom. Amorphous layers, of different nature, were Observed at the surface of the nanotubes. For La-based NTs, the thin external amorphous layer (inferior to 10 nm) can be ascribed to a Se deficiency. Contrarily, for Ho-based NTs, the thick amorphous layer (between 10 and 20 nm) is clearly ascribed to oxidation. All of these findings helped us to understand the atomic structure of these new compounds and nanotubes thereof.

Idioma: Inglés

DOI: 10.1021/acs.inorgchem.7b02680

Año: 2018

Publicado en: Inorganic Chemistry 57, 2 (2018), 747-753
ISSN: 0020-1669

Factor impacto JCR: 4.85 (2018)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 4 / 45 = 0.089 (2018) - Q1 - T1

Factor impacto SCIMAGO: 1.501 - Chemistry (miscellaneous) (Q1) - Physical and Theoretical Chemistry (Q1) - Inorganic Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E26
Financiación: info:eu-repo/grantAgreement/EC/H2020/696656/EU/Graphene-based disruptive technologies/GrapheneCore1
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2016-79776-P

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)