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Chain Length Effect on Surface Stress of Alkanethiolates Adsorbed onto AU(111) Surface: a van der Waals Density Functional Study

Published online by Cambridge University Press:  08 August 2013

Y.-C. Shih
Affiliation:
Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
C.-S. Chen*
Affiliation:
Department of Civil Engineering, National Taiwan UniversityTaipei, Taiwan 10617, R.O.C.
K.-C. Wu
Affiliation:
Institute of Applied Mechanics, National Taiwan UniversityTaipei, Taiwan 10617, R.O.C.
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Abstract

First-principles calculations were employed to investigate the adsorption-induced surface stress of self-assembled alkanethiolate monolayers on a Au(111) surface as a function of the alkyl chain length. A recently developed fully nonlocal van der Waals density functional was used to accurately account for the chain-chain interactions. We found that surface charge redistribution produces compressive surface stress, while chain-chain interactions produce tensile surface stress. The stress induced by surface charge redistribution is about one order of magnitude greater than that of chain-chain interactions. We observed that the chain-chain interactions play an important role in determining the molecular configuration during adsorptions, and also contribute significantly to the induced anisotropic tensile (positive) surface stress. As the chain length increases the tensile stress increases at a rate of ∼ 0.32 (∼ 0.18) N/m for the direction perpendicular (parallel) to the chain tilt direction.

Type
Research Article
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2014 

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Chain Length Effect on Surface Stress of Alkanethiolates Adsorbed onto AU(111) Surface: a van der Waals Density Functional Study
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