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Title: Single-layer MoS{sub 2} roughness and sliding friction quenching by interaction with atomically flat substrates

Abstract

We experimentally study the surface roughness and the lateral friction force in single-layer MoS{sub 2} crystals deposited on different substrates: SiO{sub 2}, mica, and hexagonal boron nitride (h-BN). Roughness and sliding friction measurements are performed by atomic force microscopy. We find a strong dependence of the MoS{sub 2} roughness on the underlying substrate material, being h-BN the substrate which better preserves the flatness of the MoS{sub 2} crystal. The lateral friction also lowers as the roughness decreases, and attains its lowest value for MoS{sub 2} flakes on h-BN substrates. However, it is still higher than for the surface of a bulk MoS{sub 2} crystal, which we attribute to the deformation of the flake due to competing tip-to-flake and flake-to-substrate interactions.

Authors:
 [1];  [2];  [1]
  1. Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid E-28049 (Spain)
  2. Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft (Netherlands)
Publication Date:
OSTI Identifier:
22314510
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMIC FORCE MICROSCOPY; BORON NITRIDES; CRYSTALS; MICA; MOLYBDENUM SULFIDES; QUENCHING; ROUGHNESS; SILICON OXIDES; SLIDING FRICTION; SUBSTRATES

Citation Formats

Quereda, J., Castellanos-Gomez, A., Agraït, N., Instituto Madrileño de Estudios Avanzados en Nanociencia, IMDEA-Nanociencia, E-28049 Madrid, Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid, Condensed Matter Physics Center, Rubio-Bollinger, G., E-mail: gabino.rubio@uam.es, Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid, and Condensed Matter Physics Center. Single-layer MoS{sub 2} roughness and sliding friction quenching by interaction with atomically flat substrates. United States: N. p., 2014. Web. doi:10.1063/1.4892650.
Quereda, J., Castellanos-Gomez, A., Agraït, N., Instituto Madrileño de Estudios Avanzados en Nanociencia, IMDEA-Nanociencia, E-28049 Madrid, Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid, Condensed Matter Physics Center, Rubio-Bollinger, G., E-mail: gabino.rubio@uam.es, Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid, & Condensed Matter Physics Center. Single-layer MoS{sub 2} roughness and sliding friction quenching by interaction with atomically flat substrates. United States. doi:10.1063/1.4892650.
Quereda, J., Castellanos-Gomez, A., Agraït, N., Instituto Madrileño de Estudios Avanzados en Nanociencia, IMDEA-Nanociencia, E-28049 Madrid, Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid, Condensed Matter Physics Center, Rubio-Bollinger, G., E-mail: gabino.rubio@uam.es, Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid, and Condensed Matter Physics Center. Mon . "Single-layer MoS{sub 2} roughness and sliding friction quenching by interaction with atomically flat substrates". United States. doi:10.1063/1.4892650.
@article{osti_22314510,
title = {Single-layer MoS{sub 2} roughness and sliding friction quenching by interaction with atomically flat substrates},
author = {Quereda, J. and Castellanos-Gomez, A. and Agraït, N. and Instituto Madrileño de Estudios Avanzados en Nanociencia, IMDEA-Nanociencia, E-28049 Madrid and Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid and Condensed Matter Physics Center and Rubio-Bollinger, G., E-mail: gabino.rubio@uam.es and Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid and Condensed Matter Physics Center},
abstractNote = {We experimentally study the surface roughness and the lateral friction force in single-layer MoS{sub 2} crystals deposited on different substrates: SiO{sub 2}, mica, and hexagonal boron nitride (h-BN). Roughness and sliding friction measurements are performed by atomic force microscopy. We find a strong dependence of the MoS{sub 2} roughness on the underlying substrate material, being h-BN the substrate which better preserves the flatness of the MoS{sub 2} crystal. The lateral friction also lowers as the roughness decreases, and attains its lowest value for MoS{sub 2} flakes on h-BN substrates. However, it is still higher than for the surface of a bulk MoS{sub 2} crystal, which we attribute to the deformation of the flake due to competing tip-to-flake and flake-to-substrate interactions.},
doi = {10.1063/1.4892650},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 5,
volume = 105,
place = {United States},
year = {2014},
month = {8}
}