TY - JOUR
T1 - Nanoscale contact mechanics of the interactions at monolayer MoS2 interfaces with Au and Si
AU - Agmon, Liron
AU - Almog, Roy
AU - Gaspar, Dana
AU - Voscoboynik, Guy
AU - Choudhary, Meenakshi
AU - Jopp, Juergen
AU - Klausner, Ziv
AU - Ya'akobovitz, Assaf
AU - Berkovich, Ronen
N1 - Funding Information:
We would like to thank Prof. Saša Zelenika from the University of Rijeka for informative correspondence about tip-wear mechanisms. This work was supported by Pazy Foundation, grant ID 133-2020 (Z.K. and R.B.). This work has not been published previously, and it is not under consideration for publication elsewhere. Its publication is approved by all authors and tacitly or explicitly by the responsible authorities where the work was carried out, and, if accepted, it will not be published elsewhere in the same form, in English or in any other language, including electronically without the written consent of the copyright-holder.
Funding Information:
We would like to thank Prof. Saša Zelenika from the University of Rijeka for informative correspondence about tip-wear mechanisms. This work was supported by Pazy Foundation , grant ID 133-2020 (Z.K. and R.B.).
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/10/1
Y1 - 2022/10/1
N2 - Molybdenum disulfide (MoS2) is a two-dimensional material that exhibits unique interfacial interactions with gold (Au) and silicon (Si). These interfaces have gained attention due to their potential to be integrated into a broad range of applications, where they involve direct contact that affects their performance. Here we investigate the nanoscale mechanical contact interaction of MoS2 monolayers with Au and Si, using adhesion measurements and friction force microscopy. MoS2-Au contact exhibits pronounced adhesive interaction, manifested by higher adhesion pull-off forces and energies, compared to MoS2-Si. Influenced by the adhesive contacts, the friction forces recorded demonstrate stronger lateral interactions and stronger interfacial shear strength between MoS2 and Au. Analysis with the Prandtl–Tomlinson model reveals that the MoS2-Au direct interaction is also stiffer, suggesting higher elastic energy at the contact. This information on the mechanistic nature of MoS2-Au and MoS2-Si contacts under shear and normal loads is of potential importance in applications where such interfaces are utilized, such as in the design of coatings, sensors and mechanoelectrical devices.
AB - Molybdenum disulfide (MoS2) is a two-dimensional material that exhibits unique interfacial interactions with gold (Au) and silicon (Si). These interfaces have gained attention due to their potential to be integrated into a broad range of applications, where they involve direct contact that affects their performance. Here we investigate the nanoscale mechanical contact interaction of MoS2 monolayers with Au and Si, using adhesion measurements and friction force microscopy. MoS2-Au contact exhibits pronounced adhesive interaction, manifested by higher adhesion pull-off forces and energies, compared to MoS2-Si. Influenced by the adhesive contacts, the friction forces recorded demonstrate stronger lateral interactions and stronger interfacial shear strength between MoS2 and Au. Analysis with the Prandtl–Tomlinson model reveals that the MoS2-Au direct interaction is also stiffer, suggesting higher elastic energy at the contact. This information on the mechanistic nature of MoS2-Au and MoS2-Si contacts under shear and normal loads is of potential importance in applications where such interfaces are utilized, such as in the design of coatings, sensors and mechanoelectrical devices.
KW - Adhesion
KW - Contact interactions
KW - MoS
KW - Nano-scale friction
KW - Stick-slip
UR - http://www.scopus.com/inward/record.url?scp=85133922471&partnerID=8YFLogxK
U2 - 10.1016/j.triboint.2022.107734
DO - 10.1016/j.triboint.2022.107734
M3 - Article
AN - SCOPUS:85133922471
SN - 0301-679X
VL - 174
JO - Tribology International
JF - Tribology International
M1 - 107734
ER -