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

Marco Serra,Iddo Pinkas,Erumpukuthickal Ashokkumar Anumol,Andrey Enyashin,Francis Leonard Deepak,Ernesto Joselevich,Dalit Stolovas,Reshef Tenne

doi:10.3762/bjnano.10.111

Marco Serra, Iddo Pinkas + Show 6 more

Open Access

https://doi.org/10.3762/bjnano.10.111

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Journal: Beilstein Journal of Nanotechnology	Publication Date: May 24, 2019
Citations: 5	License type: CC BY 4.0

Affiliation: Ural Federal University

Abstract

Misfit-layered compounds (MLCs) are formed by the combination of different lattices and exhibit intriguing structural and morphological characteristics. MLC SrxLa1−xS–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 (LaxSr1−xS) 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.

Highlights

Since their discovery in 1992 [1], inorganic nanotubes (INTs) have attracted the interest of many researchers due to their electrical, optical, mechanical and thermoelectric properties [2] derived from their unique structure
Scanning electron microscopy (SEM) analysis showed that the nanotubes are formed in all the different compositions, the yield of the nanotubes decreased with increasing Sr content
This phenomenon was attributed to the reduced charge transfer between the La atoms within the (LaS) slab and the TaS2 layer, resulting in a weakening of the interlayer polar forces

Summary

Introduction

Since their discovery in 1992 [1], inorganic nanotubes (INTs) have attracted the interest of many researchers due to their electrical, optical, mechanical and thermoelectric properties [2] derived from their unique structure. The reduced abundance of the NTs with increasing Sr content in the precursor may be rationalized on the basis of the reduced charge transfer between the MS unit (LaxSr1−xS) and the TaS2 layer in the MLC which destabilize the MLC lattice.

Results

Conclusion