Quaternary LnxLa(1-x)S-TaS2 nanotubes (Ln=Pr, Sm, Ho, and Yb) as a vehicle for improving the yield of misfit nanotubes

Serra, Marco; Lajaunie, Luc; Sreedhara, M. B.; Miroshnikov, Yana; Pinkas, Iddo; Calvino, José J.; Enyashin, Andrey N.; Tenne, Reshef

doi:10.1016/j.apmt.2020.100581

Cited by 7 publications

(13 citation statements)

References 51 publications

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“… 31 Previously, NTs from mixed rare-earth lattices Ln x La (1– x ) S-TaS 2 (Ln = Pr, Sm, Ho, Yb) were prepared and analyzed via Raman spectroscopy. 31 The Raman modes (A 1g ) of the rock-salt unit of the mixed tubes exhibited a blue shift and splitting into two peaks in the case of an electronic structure with open 4f-shell (Pr, Sm, Ho) (mixed with La atoms). On the other hand, the Raman modes of the rock-salt lattice of a closed 4f-shell (Yb) atom revealed a red shift in comparison with the pure LaS-TaS 2 nanotubes.…”

Section: Resultsmentioning

confidence: 99%

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YS-TaS₂ and Y_xLa_1–xS-TaS₂ (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

Hettler

Sreedhara²,

Serra

et al. 2020

ACS Nano

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We present the analysis of a family of nanotubes (NTs) based on the quaternary misfit layered compound (MLC) Y x La 1– x S-TaS 2 . 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-TaS 2 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 Y x La 1– x S-TaS 2 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.

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Section: Resultsmentioning

confidence: 99%

“…The structural modulation and the valence shell configuration of the rare-earth atom in the rock-salt unit vastly affect the Raman modes of the LnS unit . Previously, NTs from mixed rare-earth lattices Ln x La (1– x ) S-TaS 2 (Ln = Pr, Sm, Ho, Yb) were prepared and analyzed via Raman spectroscopy .…”

Section: Resultsmentioning

confidence: 99%

YS-TaS₂ and Y_xLa_1–xS-TaS₂ (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

Hettler

Sreedhara²,

Serra

et al. 2020

ACS Nano

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“… 39 The amount of charge transfer can be tuned by alloying the rocksalt (LnS) unit with other rare earth or heteroatoms. 40 , 41 The role of the charge transfer from the Ln atoms to the Ta atoms has been elucidated. 25 , 41 In particular, since the work function of the LnS subunit is smaller than that of the hexagonal TaS 2 , charge transfer occurs from the rare-earth atom to the partially occupied 5 d z 2 level of the tantalum atom.…”

Section: Introductionmentioning

confidence: 99%

“… 40 , 41 The role of the charge transfer from the Ln atoms to the Ta atoms has been elucidated. 25 , 41 In particular, since the work function of the LnS subunit is smaller than that of the hexagonal TaS 2 , charge transfer occurs from the rare-earth atom to the partially occupied 5 d z 2 level of the tantalum atom. This charge transfer modifies the effective valence state of the rare-earth atom (2+) closer to the more stable 3+ state.…”

Section: Introductionmentioning

confidence: 99%

Nanotubes from the Misfit Layered Compound (SmS)_1.19TaS₂: Atomic Structure, Charge Transfer, and Electrical Properties

et al. 2022

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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 5 d 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 Ω·cm at room temperature, and magnetic susceptibility measurements show a superconducting transition at 4 K.

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“…It is known, that during the nanotube (NT) synthesis additional unwanted phases often occur (platelets, fullerenes, amorphic content, etc.) [1] and it is very hard or even impossible to disentangle the information about the NTs from the data achieved by macroscopic methods. The purpose of this study is to show the advantages of the DAFS (Diffraction Anomalous Fine Structure) spectroscopy technique in analysis of NT powders containing a sufficient number of unwanted phases.…”

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Growth and stability of SmS-TaS₂ nanotubes studied by XAFS and DAFS methods

Khadiev¹,

Bhyrappa²,

Tenne³

et al. 2021

Acta Cryst Sect A

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Quaternary LnxLa(1-x)S-TaS2 nanotubes (Ln=Pr, Sm, Ho, and Yb) as a vehicle for improving the yield of misfit nanotubes

Cited by 7 publications

References 51 publications

YS-TaS₂ and Y_xLa_1–xS-TaS₂ (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

YS-TaS₂ and Y_xLa_1–xS-TaS₂ (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

Nanotubes from the Misfit Layered Compound (SmS)_1.19TaS₂: Atomic Structure, Charge Transfer, and Electrical Properties

Growth and stability of SmS-TaS₂ nanotubes studied by XAFS and DAFS methods

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Quaternary LnxLa(1-x)S-TaS2 nanotubes (Ln=Pr, Sm, Ho, and Yb) as a vehicle for improving the yield of misfit nanotubes

Cited by 7 publications

References 51 publications

YS-TaS2 and YxLa1–xS-TaS2 (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

YS-TaS2 and YxLa1–xS-TaS2 (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

Nanotubes from the Misfit Layered Compound (SmS)1.19TaS2: Atomic Structure, Charge Transfer, and Electrical Properties

Growth and stability of SmS-TaS2 nanotubes studied by XAFS and DAFS methods

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YS-TaS₂ and Y_xLa_1–xS-TaS₂ (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

YS-TaS₂ and Y_xLa_1–xS-TaS₂ (0 ≤ x ≤ 1) Nanotubes: A Family of Misfit Layered Compounds

Nanotubes from the Misfit Layered Compound (SmS)_1.19TaS₂: Atomic Structure, Charge Transfer, and Electrical Properties

Growth and stability of SmS-TaS₂ nanotubes studied by XAFS and DAFS methods