Intercalation leads to inverse layer dependence of friction on chemically doped MoS2

Ogulcan Acikgoz; Enrique Guerrero; Alper Yanilmaz; Omur E Dagdeviren; Cem Çelebi; David A Strubbe; Mehmet Z Baykara

doi:10.1088/1361-6528/ac9393

Intercalation leads to inverse layer dependence of friction on chemically doped MoS₂

Nanotechnology. 2022 Oct 12;34(1). doi: 10.1088/1361-6528/ac9393.

Authors

Ogulcan Acikgoz^{1

2}, Enrique Guerrero³, Alper Yanilmaz⁴, Omur E Dagdeviren⁵, Cem Çelebi⁴, David A Strubbe³, Mehmet Z Baykara¹

Affiliations

¹ Department of Mechanical Engineering, University of California Merced, Merced, CA 95343, United States of America.
² Microelectronics Guidance and Electro-Optics Division, Aselsan Inc., Ankara 06750, Turkey.
³ Department of Physics, University of California Merced, Merced, CA 95343, United States of America.
⁴ Department of Physics, Izmir Institute of Technology, Izmir 35430, Turkey.
⁵ Department of Mechanical Engineering, École de technologie supérieure, University of Quebec, Quebec H3C 1K3, Canada.

PMID: 36130587
DOI: 10.1088/1361-6528/ac9393

Abstract

We present results of atomic-force-microscopy-based friction measurements on Re-doped molybdenum disulfide (MoS₂). In stark contrast to the widespread observation of decreasing friction with increasing number of layers on two-dimensional (2D) materials, friction on Re-doped MoS₂exhibits an anomalous, i.e. inverse, dependence on the number of layers. Raman spectroscopy measurements combined withab initiocalculations reveal signatures of Re intercalation. Calculations suggest an increase in out-of-plane stiffness that inversely correlates with the number of layers as the physical mechanism behind this remarkable observation, revealing a distinctive regime of puckering for 2D materials.

Keywords: atomic force microscopy; chemical doping; density functional theory; friction; molybdenum disulfide.