Frictional Characteristics of Atomically Thin Sheets

被引：1618

作者：

Lee, Changgu ^{[2
]}

Li, Qunyang ^{[1
]}

Kalb, William ^{[2
]}

Liu, Xin-Zhou ^{[3
]}

Berger, Helmuth ^{[4
]}

Carpick, Robert W. ^{[1
]}

Hone, James ^{[2
]}

机构：

[1] Univ Penn, Dept Mech Engn & Appl Mech, Philadelphia, PA 19104 USA

[2] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[3] Leiden Univ, Dept Phys, NL-2300 RA Leiden, Netherlands

[4] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, CH-1015 Lausanne, Switzerland

来源：

SCIENCE | 2010年 / 328卷 / 5974期

基金：

美国国家科学基金会;

关键词：

FORCE MICROSCOPE; SCALE FRICTION; GRAPHENE; GRAPHITE; CALIBRATION; MODEL;

D O I：

10.1126/science.1184167

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Using friction force microscopy, we compared the nanoscale frictional characteristics of atomically thin sheets of graphene, molybdenum disulfide (MoS2), niobium diselenide, and hexagonal boron nitride exfoliated onto a weakly adherent substrate (silicon oxide) to those of their bulk counterparts. Measurements down to single atomic sheets revealed that friction monotonically increased as the number of layers decreased for all four materials. Suspended graphene membranes showed the same trend, but binding the graphene strongly to a mica surface suppressed the trend. Tip-sample adhesion forces were indistinguishable for all thicknesses and substrate arrangements. Both graphene and MoS2 exhibited atomic lattice stick-slip friction, with the thinnest sheets possessing a sliding-length-dependent increase in static friction. These observations, coupled with finite element modeling, suggest that the trend arises from the thinner sheets' increased susceptibility to out-of-plane elastic deformation. The generality of the results indicates that this may be a universal characteristic of nanoscale friction for atomically thin materials weakly bound to substrates.

引用

页码：76 / 80

页数：5

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