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Origins of Viscoelastic Dissipation in Self-Assembled Organic Monolayers

Published online by Cambridge University Press:  10 February 2011

N. D. Shinn  and
T. A. Michalske
N. D. Shinn
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1413;, [email protected]
T. A. Michalske
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1413;, [email protected]
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Abstract

Although self-assembled monolayers (SAMs) are promising candidates for interfacial lubricants in micro-electromechanical systems, the relationship between the monolayer structure and its viscoelastic properties is not understood. Using Acoustic Wave Damping (AWD), we have measured the complex shear modulus of linear alkane thiol monolayers, HS(CH2)n-1 CH3 denoted as Cn, on Au(111)-textured substrates. The AWD technique measures the elastic energy storage and dissipative loss within a SAM adsorbed onto the electrodes of a quartz crystal microbalance. For C12, C14, and C18, SAMs, the storage modulus increases with alkane chain length, but the loss modulus exhibits no systematic correlation. To investigate the origins of energy dissipation, we used a new, high-sensitivity oscillator circuit to simultaneously monitor the adsorption kinetics and acoustic damping during monolayer growth from the gas phase. For both C9 and C12 thiols, the dissipation in the growing monolayer can be correlated with distinct two-dimensional fluid phases and the nucleation and growth of condensed-phase islands.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 169
Copyright
Copyright © Materials Research Society 1998

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