Title of Work

Quantum confinement in few layer SnS nanosheets

Document Type

Article

Publication/Presentation Date

January 2019

Volume

30

Issue

24

DOI

https://doi.org/10.1088/1361-6528/ab0e3e

Abstract

Orthorhombic tin monosulfide (SnS) consists of layers of covalently bound Sn and S atoms held together by weak van der Waals forces and is a stable two-dimensional material with potentially useful properties in emerging applications such as valleytronics. Large-scale sustainable synthesis of few-layer (e.g., 1-10 layers) SnS is a challenge, which also slows progress in understanding their properties as a function of number of layers. Herein we describe solvothermal synthesis of SnS in water or ethylene glycol. The latter yields a flower-like morphology where the petals are SnS nanoplates and sonication and separation of these flowers via differential centrifugation yields 1-10 layer SnS nanoplates. The direct optical absorption edges of these SnS nanoplates blue-shift due to quantum confinement from 1.33 eV to 1.88 eV as the thickness (number of layers) is decreased from ~ 5 nm (10 layers) to ~ 2 nm (4 layers).

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