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Thickness dependent friction on few-layer MoS2, WS2, and WSe2 / Liang Fang; Da-Meng Liu; Yuzheng Guo; Zhi-Min Liao; Jian-Bin Luo; Shi-Zhu Wen

Nanotechnology, Volume: 28, Issue: 24, Start page: 245703

Swansea University Author: Guo, Yuzheng

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Abstract

Nanoscale friction on two-dimensional (2D) materials is closely associated with their mechanical, electronic and photonic properties, which can be modulated through changing thickness. Here, we investigated the thickness dependent friction on few-layer MoS2, WS2, and WSe2 using atomic force microsco...

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Published in: Nanotechnology
ISSN: 0957-4484 1361-6528
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34401
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spelling 2017-09-07T13:32:39Z v2 34401 2017-06-20 Thickness dependent friction on few-layer MoS2, WS2, and WSe2 Yuzheng Guo Yuzheng Guo true 0000-0003-2656-0340 false 2c285ab01f88f7ecb25a3aacabee52ea ca6eaec62d53427333c2fdd0967e29f3 yuiXDDPmSM3HuYmRdX7apxXCE6Z9OGBXOD9D5JU4+T4= 2017-06-20 EEN Nanoscale friction on two-dimensional (2D) materials is closely associated with their mechanical, electronic and photonic properties, which can be modulated through changing thickness. Here, we investigated the thickness dependent friction on few-layer MoS2, WS2, and WSe2 using atomic force microscope at ambient condition and found two different behavior. When a sharp tip was used, the regular behavior of decreasing friction with increasing thickness was reproduced. However, when a pre-worn and flat-ended tip was used, we observed an abnormal trend: on WS2 and WSe2, friction increased monotonically with thickness, while for MoS2, friction decreased from monolayer to bilayer and then subsequently increased with thickness. As suggested by the density functional theory calculation, we hypothesize that the overall frictional behavior is a competition between the puckering effect and the intrinsic energy corrugation within the compressive region. By varying the relative strength of the puckering effect via changing the tip shape, the dependence of friction on sample thickness can be tuned. Our results also suggest a potential means to measure intrinsic frictional properties of 2D materials with minimum impact from puckering. Journal article Nanotechnology 28 24 245703 0957-4484 1361-6528 puckering effect, thickness dependent friction, transition metal dichalcogenides 25 5 2017 2017-05-25 10.1088/1361-6528/aa712b College of Engineering Engineering CENG EEN None None 2017-09-07T13:32:39Z 2017-06-20T15:22:59Z College of Engineering Engineering Liang Fang 1 Da-Meng Liu 2 Yuzheng Guo 3 Zhi-Min Liao 4 Jian-Bin Luo 5 Shi-Zhu Wen 6
title Thickness dependent friction on few-layer MoS2, WS2, and WSe2
spellingShingle Thickness dependent friction on few-layer MoS2, WS2, and WSe2
Guo, Yuzheng
title_short Thickness dependent friction on few-layer MoS2, WS2, and WSe2
title_full Thickness dependent friction on few-layer MoS2, WS2, and WSe2
title_fullStr Thickness dependent friction on few-layer MoS2, WS2, and WSe2
title_full_unstemmed Thickness dependent friction on few-layer MoS2, WS2, and WSe2
title_sort Thickness dependent friction on few-layer MoS2, WS2, and WSe2
author_id_str_mv 2c285ab01f88f7ecb25a3aacabee52ea
author_id_fullname_str_mv 2c285ab01f88f7ecb25a3aacabee52ea_***_Guo, Yuzheng
author Guo, Yuzheng
author2 Liang Fang
Da-Meng Liu
Yuzheng Guo
Zhi-Min Liao
Jian-Bin Luo
Shi-Zhu Wen
format Journal article
container_title Nanotechnology
container_volume 28
container_issue 24
container_start_page 245703
publishDate 2017
institution Swansea University
issn 0957-4484
1361-6528
doi_str_mv 10.1088/1361-6528/aa712b
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 0
active_str 1
description Nanoscale friction on two-dimensional (2D) materials is closely associated with their mechanical, electronic and photonic properties, which can be modulated through changing thickness. Here, we investigated the thickness dependent friction on few-layer MoS2, WS2, and WSe2 using atomic force microscope at ambient condition and found two different behavior. When a sharp tip was used, the regular behavior of decreasing friction with increasing thickness was reproduced. However, when a pre-worn and flat-ended tip was used, we observed an abnormal trend: on WS2 and WSe2, friction increased monotonically with thickness, while for MoS2, friction decreased from monolayer to bilayer and then subsequently increased with thickness. As suggested by the density functional theory calculation, we hypothesize that the overall frictional behavior is a competition between the puckering effect and the intrinsic energy corrugation within the compressive region. By varying the relative strength of the puckering effect via changing the tip shape, the dependence of friction on sample thickness can be tuned. Our results also suggest a potential means to measure intrinsic frictional properties of 2D materials with minimum impact from puckering.
published_date 2017-05-25T21:43:40Z
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score 10.836733