284178 Low-Density Self-Assembled Monolayers for Functional Host-Guest Thin Films

Wednesday, October 31, 2012: 1:55 PM
414 (Convention Center )
Duhyun Shin and Stephen M. Martin, Chemical Engineering, Virginia Tech, Blacksburg, VA

We have investigated the exchange of functional guest molecules for tunable surfaces with host-guest thin film systems. Self-assembled host-monolayers containing pre-existing cavities have been prepared on a quartz-crystal or gold substrate via a stepwise reaction. The host-monolayers consist of an integrated spacer, usually aromatic group such as anthracene-derivatives, at the base of the cavity. Guest molecules consisting of a functional moiety and a long alkane tail can be then inserted into the host-cavities in order to form functionalized surfaces. The insertion and replacement processes of guest molecules from an organic solution into the host-cavities have been measured using quartz crystal microbalance with dissipation monitoring, QCM-D. In addition to the frequency (mass) change of inserted quest molecules, changes in the film structure upon guest insertion was also obtained via X-ray reflectivity. The resultant host-guest thin films were also characterized by contact angle measurements, Fourier Transform infrared spectroscopy, and X-ray photoelectron spectroscopy.

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See more of this Session: Self-Assembly in Solution
See more of this Group/Topical: Engineering Sciences and Fundamentals