Measuring anisotropic friction on WTe2 using atomic force microscopy in the force–distance and Friction modes
Watson, Gregory, Myhra, Sverre, and Watson, Jolanta (2010) Measuring anisotropic friction on WTe2 using atomic force microscopy in the force–distance and Friction modes. Journal of Nanoscience and Nanotechnology, 10 (4). pp. 2463-2472.
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Layered materials which can be easily cleaved have proved to be excellent samples for the study of atomic scale friction. The layered transition metal dichalcogenides have been particularly popular. These materials exhibit a number of interesting properties ranging from superconductivity to low frictional coefficients. In this paper we have investigated the tribology of the dichalcogenide-WTe2. The coefficient of friction is less than 0.040 along the Te rows and increases to over 0.045 across the rows. The frictional forces almost doubled at normal loads of 5000 nN when scanning in the  direction in comparison to the  direction. The frictional responses of the AFM probe have been monitored in the frictional force and force-versus-distance (f–d) mode. A comparison between the outcomes using the two different modes demonstrates the factors which need to be considered for accurate measurements.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||anisotropic, WTe2, stick-slip, force distance, friction, atomic force microscopy, frictional force, AFM|
|Date Deposited:||15 Apr 2011 04:25|
|FoR Codes:||02 PHYSICAL SCIENCES > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified @ 50%
03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry of Materials @ 50%
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 50%
97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
|Citation Count from Web of Science||