Journal article 1258 views
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
,
Zhi-Min Liao,
Jian-Bin Luo,
Shi-Zhu Wen
Nanotechnology, Volume: 28, Issue: 24, Start page: 245703
Swansea University Author:
Yuzheng Guo
Full text not available from this repository: check for access using links below.
DOI (Published version): 10.1088/1361-6528/aa712b
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...
| Published in: | Nanotechnology |
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| ISSN: | 0957-4484 1361-6528 |
| Published: |
2017
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa34401 |
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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 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. |
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| Keywords: |
puckering effect, thickness dependent friction, transition metal dichalcogenides |
| College: |
Faculty of Science and Engineering |
| Issue: |
24 |
| Start Page: |
245703 |