AVS 51st International Symposium
    Surface Science Thursday Sessions
       Session SS2-ThM

Paper SS2-ThM11
Tribological Behavior of Self-Assembled Double Layer Measured by a Pin-on-plate Method

Thursday, November 18, 2004, 11:40 am, Room 210C

Session: Tribology, Adhesion, and Friction
Presenter: M. Nakano, National Institute of Advanced Industrial Science and Technology, Japan
Authors: M. Nakano, National Institute of Advanced Industrial Science and Technology, Japan
T. Ishida, National Institute of Advanced Industrial Science and Technology, Japan
T. Numata, National Institute of Advanced Industrial Science and Technology, Japan
Y. Ando, National Institute of Advanced Industrial Science and Technology, Japan
S. Sasaki, National Institute of Advanced Industrial Science and Technology, Japan
Correspondent: Click to Email
We investigated the tribological behavior of self-assembled double layers using pin-on-plate method in this study. Previously we have been investigated the tribological behavior of alkanethiol self-assembled monolayers using pin-on-plate method and X-ray photoelectron spectroscopy [1]. We found that the friction coefficient was dependent on the alkylchain length and that even a monolayer film has sufficient durability against friction, although the friction coefficients measured at 0.2-0.3 were slightly high. It was pointed out that formation of a new overlayer on monolayer could lead to decrease the friction. From this point of view, here we investigated the tribological behavior of self-assembled double layers using pin-on-plate method. Double layer preparation on Au substrates was performed in a glass beaker at room temperature. Substrates were first exposed to a 1 mM of mercaptohexadecanoic acid solution in ethanol for 24 h. Then, the samples were exposed to a 1 mM of copper acetate solution in ethanol for approximately 5 min. Finally, the samples were exposed to a 1 mM of octadecanethiol solution in ethanol for 24 h [2]. The frictional properties of the SAMs were examined by a pin-on-plate tribometer with a load of 30 mN and sliding speeds of 1 mm/sec (0.2 Hz). The friction coefficient on double layer was kept at 0.10-0.15 for about 30 min, indicating that the topmost octadecanethiol layer was expected to act as the mobile layer and effective to decrease the friction. Ref. [1] M. Nakano, T. Ishida, T. Numata, Y. Ando, S. Sasaki: Jpn. J. Appl. Phys. 42 (2003) 4735. [2] H. Ohno, L. A. Nagahara, W. Mizutani, J. Takagi, H. Tokumoto: Jpn. J. Appl. Phys. 38 (1999) 180.