Raman spectroscopy of intercalated and misfit layer nanotubes

Staiger, Matthias; Bačić, Vladimir; Gillen, Roland; Radovsky, Gal; Gartsman, K.; Tenne, Reshef; Heine, Thomas; Maultzsch, Janina; Thomsen, C.

doi:10.1103/physrevb.94.035430

Cited by 9 publications

(12 citation statements)

References 59 publications

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“…The Raman mode observed at 324 cm –1 corresponds to the E 2g mode of TaS 2 ; the large shift in this mode compared to bulk TaS 2 flakes (280 cm –1 ) was ascribed to charge transfer from LaS to the TaS 2 . , In the present case, this mode is marginally shifted to higher energies on replacing La by Y, which could be explained by a slightly modified charge transfer from the YS to TaS 2 in comparison with LaS to the TaS 2 . The 400 cm –1 peak was assigned to the out-of-plane A 1g mode of TaS 2 .…”

Section: Resultssupporting

confidence: 44%

“…It is also noted that the metal atom in the TS 2 layer influences the frequency of RSI and RSII modes as observed in the case of LaS-TaS 2 and LaS-NbS 2 . , The charge transfer influences the intralayer and interlayer interactions within the MLC lattices . The modes corresponding to the TS 2 unit, especially the E 2g mode, are affected by the charge transfer from the MS to the TS 2 unit. , …”

Section: Resultsmentioning

confidence: 84%

“… 28 The modes corresponding to the TS 2 unit, especially the E 2g mode, are affected by the charge transfer from the MS to the TS 2 unit. 28 , 29 …”

Section: Resultsmentioning

confidence: 99%

“…28 The modes corresponding to TS 2 unit, especially the E 2g mode is affected by the charge transfer from the MS to the TS 2 unit. 28,29 Raman measurements of pure YS-TaS 2 and (Y x La 1-x S) 1+y TaS 2 (x=0 to 0.9) were carried out with individual NTs in the range 100 to 500 cm -1 using 633 nm laser light and are shown in Fig. 6 (see also Fig.…”

Section: Raman Analysesmentioning

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: Resultssupporting

confidence: 44%

Section: Resultsmentioning

confidence: 84%

“… 28 The modes corresponding to the TS 2 unit, especially the E 2g mode, are affected by the charge transfer from the MS to the TS 2 unit. 28 , 29 …”

Section: Resultsmentioning

confidence: 99%

Section: Raman Analysesmentioning

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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“…This peak is blue-shifted compared to the pure TaS 2 (279 cm −1 ), which is attributed to the characteristic charge transfer from the LaS slab to that of TaS 2 . The broad band between ≈ 240 and 304 cm −1 is attributed to the two-phonon band [52], whereas the 400 cm −1 transition was assigned to the A 1g vibration of the 2 H -TaS 2 . Obviously, the diameter, number of layers and chirality varies from one nanotube to the next, and from one batch to the next.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of quaternary La(Sr)S–TaS₂ misfit-layered nanotubes

Serra¹,

Anumol²,

Stolovas³

et al. 2019

Beilstein J. Nanotechnol.

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Misfit-layered compounds (MLCs) are formed by the combination of different lattices and exhibit intriguing structural and morphological characteristics. MLC Sr x La1− x S–TaS2 nanotubes with varying Sr composition (10, 20, 40, and 60 Sr atom %, corresponding to x = 0.1, 0.2, 0.4 and 0.6, respectively) were prepared in the present study and systematically investigated using a combination of high-resolution electron microscopy and spectroscopy. These studies enable detailed insight into the structural aspects of these phases to be gained at the atomic scale. The addition of Sr had a significant impact on the formation of the nanotubes with higher Sr content, leading to a decrease in the yield of the nanotubes. This trend can be attributed to the reduced charge transfer between the rare earth/S unit (La x Sr1− x S) and the TaS2 layer in the MLC which destabilizes the MLC lattice. The influence of varying the Sr content in the nanotubes was systematically studied using Raman spectroscopy. Density functional theory calculations were carried out to support the experimental observations.

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Synthesis and Characterization of Nanotubes from Misfit (LnS)_1+yTaS₂ (Ln=Pr, Sm, Gd, Yb) Compounds

Serra

Stolovas

Houben

et al. 2018

Chemistry A European J

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The synthesis and characterization of nanotubes from misfit layered compounds (MLCs) of the type (LnS) TaS (denoted here as LnS-TaS ; Ln=Pr, Sm, Gd, and Yb), not reported before, are described (the bulk compound YbS-LaS was not previously documented). Transmission electron microscopy and selected area electron diffraction showed that the interlayer spacing along the c axis decreased with an increase in the atomic number of the lanthanide atom, which suggested tighter interaction between the LnS layer and TaS for the late lanthanides. The Raman spectra of the tubules were studied and compared to those of the bulk MLC compounds. Similar to the bulk MLCs, the Raman spectra could be divided into the low-frequency modes (110-150 cm ) of the LnS lattice and the high-frequency modes (250-400 cm ) of the TaS lattice. The Raman spectra indicated that the vibrational lattice modes of the strained layers in the tubes were stiffer than those in the bulk compounds. Furthermore, the modes of the late lanthanides were higher in energy than those of the earlier lanthanides, which suggested larger charge transfer between the LnS and TaS layers for the late lanthanides. Polarized Raman measurements showed the expected binodal intensity profile (antenna effect). The intensity ratio of the Raman signal showed that the E mode of TaS was more sensitive to the light-polarization effect than its A mode. These nanotubes are expected to reveal interesting low-temperature quasi-1D transport behavior.

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Raman spectroscopy of intercalated and misfit layer nanotubes

Cited by 9 publications

References 59 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

Synthesis and characterization of quaternary La(Sr)S–TaS₂ misfit-layered nanotubes

Synthesis and Characterization of Nanotubes from Misfit (LnS)_1+yTaS₂ (Ln=Pr, Sm, Gd, Yb) Compounds

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Raman spectroscopy of intercalated and misfit layer nanotubes

Cited by 9 publications

References 59 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

Synthesis and characterization of quaternary La(Sr)S–TaS2 misfit-layered nanotubes

Synthesis and Characterization of Nanotubes from Misfit (LnS)1+yTaS2 (Ln=Pr, Sm, Gd, Yb) Compounds

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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

Synthesis and characterization of quaternary La(Sr)S–TaS₂ misfit-layered nanotubes

Synthesis and Characterization of Nanotubes from Misfit (LnS)_1+yTaS₂ (Ln=Pr, Sm, Gd, Yb) Compounds