Nanotubes from the Misfit Compound Alloy LaS-NbxTa(1-x)S2

Dalit Stolovas; Marco Serra; Ronit Popovitz-Biro; Iddo Pinkas; Lothar Houben; Jose J. Calvino; Ernesto Joselevich; Reshef Tenne; Raul Arenal; Luc Lajaunie

doi:10.1021/acs.chemmater.8b03632

Nanotubes from the Misfit Compound Alloy LaS-NbxTa(1-x)S2

Dalit Stolovas, Marco Serra, Ronit Popovitz-Biro, Iddo Pinkas, Lothar Houben, Jose J. Calvino, Ernesto Joselevich, Reshef Tenne^*, Raul Arenal^*, Luc Lajaunie^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

Misfit layered compounds (MLC) with the composition (LaS)(1.15)TaS2 (for simplicity denoted as LaS-TaS2) and LaS-NbS2 were prepared and studied in the past. Nanotubes of LaS-TaS2 could be easily synthesized, while tubular structure of the LaS-NbS2 were found to be rather rare in the product. To understand this riddle, quaternary alloys of LaS-NbxTa(1-x)S2 with ascending Nb concentration were prepared herein in the form of nanotubes (and platelets). Not surprisingly, the concentration of these quaternary nanotubes shrank (and the relative density of platelets increased) with increasing Nb content in the precursor. The structure and chemical composition of such nanotubes was elucidated by electron microscopy. Conceivably, the TaS2 in the MLC compounds LnS-TaS2 (Ln = lanthanide atom) crystallizes in the 2H polytype. High resolution transmission electron microscopy showed however that, invariably, MLC nanotubes prepared from 80 at% Nb content in the precursor belonged to the 1T polytype. Raman spectroscopy of individual tubes revealed that up to 60 at% Nb, they obey the standard model of MLC, while higher Nb lead to large deviations, which are discussed in brief. The analysis indicated also that such nanotubes do not exhibit the pattern assigned to charge density wave transition so typical for binary 1T-TaS2. The prospect for revealing interesting quasi-1D behavior of such quaternary nanotubes is also briefly discussed.

Original language	English
Pages (from-to)	8829-8842
Number of pages	14
Journal	Chemistry of Materials
Volume	30
Issue number	24
DOIs	https://doi.org/10.1021/acs.chemmater.8b03632
Publication status	Published - 26 Dec 2018

Funding

L.L. acknowledges Dr. Lidia Esther Chinchilla Reyes (University of Cádiz) for the fruitful discussions on microscope alignment and iDPC imaging. We thank Dr. Yishay Feldman for the help with the XRD analysis. Parts of the HRSTEM and STEM-EELS studies were conducted at the Laboratorio de Microscopias Avanzadas, Instituto de Nanociencia de Aragon, Universidad de Zaragoza, Spain. R.A. gratefully acknowledges the support from the Spanish Ministry of Economy and Competitiveness (MINECO) through project Grant No. MAT2016-79776-P (AEI/FEDER, UE). We acknowledge the support of the Irving and Cherna Moskowitz Center for Nano and Bio-Nano Imaging; the Perlman Family Foundation; the Kimmel Center for Nanoscale Science Grant No. 43535000350000; and the Irving and Azelle Waltcher Foundations in honor of Prof. M. Levy Grant No. 720821. Funding from the MINECO/FEDER (Project Refs: MAT2017-87579-R and MAT2016-81118-P) is also acknowledged.

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

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title = "Nanotubes from the Misfit Compound Alloy LaS-NbxTa(1-x)S2",

abstract = "Misfit layered compounds (MLC) with the composition (LaS)(1.15)TaS2 (for simplicity denoted as LaS-TaS2) and LaS-NbS2 were prepared and studied in the past. Nanotubes of LaS-TaS2 could be easily synthesized, while tubular structure of the LaS-NbS2 were found to be rather rare in the product. To understand this riddle, quaternary alloys of LaS-NbxTa(1-x)S2 with ascending Nb concentration were prepared herein in the form of nanotubes (and platelets). Not surprisingly, the concentration of these quaternary nanotubes shrank (and the relative density of platelets increased) with increasing Nb content in the precursor. The structure and chemical composition of such nanotubes was elucidated by electron microscopy. Conceivably, the TaS2 in the MLC compounds LnS-TaS2 (Ln = lanthanide atom) crystallizes in the 2H polytype. High resolution transmission electron microscopy showed however that, invariably, MLC nanotubes prepared from 80 at% Nb content in the precursor belonged to the 1T polytype. Raman spectroscopy of individual tubes revealed that up to 60 at% Nb, they obey the standard model of MLC, while higher Nb lead to large deviations, which are discussed in brief. The analysis indicated also that such nanotubes do not exhibit the pattern assigned to charge density wave transition so typical for binary 1T-TaS2. The prospect for revealing interesting quasi-1D behavior of such quaternary nanotubes is also briefly discussed.",

author = "Dalit Stolovas and Marco Serra and Ronit Popovitz-Biro and Iddo Pinkas and Lothar Houben and Calvino, {Jose J.} and Ernesto Joselevich and Reshef Tenne and Raul Arenal and Luc Lajaunie",

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AU - Stolovas, Dalit

AU - Serra, Marco

AU - Popovitz-Biro, Ronit

AU - Pinkas, Iddo

AU - Houben, Lothar

AU - Calvino, Jose J.

AU - Joselevich, Ernesto

AU - Tenne, Reshef

AU - Arenal, Raul

AU - Lajaunie, Luc

PY - 2018/12/26

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AB - Misfit layered compounds (MLC) with the composition (LaS)(1.15)TaS2 (for simplicity denoted as LaS-TaS2) and LaS-NbS2 were prepared and studied in the past. Nanotubes of LaS-TaS2 could be easily synthesized, while tubular structure of the LaS-NbS2 were found to be rather rare in the product. To understand this riddle, quaternary alloys of LaS-NbxTa(1-x)S2 with ascending Nb concentration were prepared herein in the form of nanotubes (and platelets). Not surprisingly, the concentration of these quaternary nanotubes shrank (and the relative density of platelets increased) with increasing Nb content in the precursor. The structure and chemical composition of such nanotubes was elucidated by electron microscopy. Conceivably, the TaS2 in the MLC compounds LnS-TaS2 (Ln = lanthanide atom) crystallizes in the 2H polytype. High resolution transmission electron microscopy showed however that, invariably, MLC nanotubes prepared from 80 at% Nb content in the precursor belonged to the 1T polytype. Raman spectroscopy of individual tubes revealed that up to 60 at% Nb, they obey the standard model of MLC, while higher Nb lead to large deviations, which are discussed in brief. The analysis indicated also that such nanotubes do not exhibit the pattern assigned to charge density wave transition so typical for binary 1T-TaS2. The prospect for revealing interesting quasi-1D behavior of such quaternary nanotubes is also briefly discussed.

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Nanotubes from the Misfit Compound Alloy LaS-NbxTa(1-x)S2

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