Combining Spontaneous Molecular Assembly with Microfabrication to Pattern Surfaces

摘要

Platinum electrodes can be functionalized by spontaneous binding of p-(ferrocenyl)phenylisonitrile, I, or m-chloro-p-(ferrocenyl)phenylisonitrile, II, by reaction of pretreated Pt with approx. 1 mM I or II in Acetonitrile at 298 K. FTIR is consistent with attachment of I or II via a -NC-Pt linkage. XPS, AES, and electromechanical characterizations are consistent with attachment of one monolayer of redox active material with a potential of approx. +0.6 V vs. silver due to the ferrocenyl moiety. XPS and AES show selective binding (>100:1) of I or II to Pt compared to the silicon nitride substrate of Pt microelectrode arrays. An AES line scan shows the isonitrile to only be on the eight Pt electrodes each approx. 90 2 micrometers x approx. 90 micrometers long x 0.1 micrometer thick and separated from each other by 1.4 micrometers. The data show that spontaneous self-assembly and microfabrication can be used to pattern surfaces with redox active molecular reagents. (AW)