AVS 52nd International Symposium
    Nanometer-Scale Science and Technology Monday Sessions
       Session NS2-MoA

Paper NS2-MoA3
Directed Assembly and Separation of Self-Assembled Monolayers Via Electrochemical Processing

Monday, October 31, 2005, 2:40 pm, Room 210

Session: Nanometer Scale Assembly
Presenter: T.J. Mullen, The Pennsylvania State University
Authors: T.J. Mullen, The Pennsylvania State University
A.A. Dameron, The Pennsylvania State University
J.R. Hampton, The Pennsylvania State University
P.S. Weiss, The Pennsylvania State University
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We have directed separation in self-assembled monolayers (SAMs) on Au{111} using electrochemical desorption and characterized them with scanning tunneling microscopy (STM) and voltammetry. Separated domains of 1-dodecanthiolate were created by solution insertion into 1-adamantanethiolate SAMs. The adamantanethiolate domains were selectively desorbed by applying a reductive potential. Subsequently, the samples were immersed in 1-octanethiol solution, thereby producing SAMs with separated domains of dodecanthiolate and octanethiolate. We have investigated the molecular order of each lattice type with STM. The apparent height difference in the STM images and the two distinct cathodic peaks observed with voltammetry indicate distinct separated domains. The fractional coverages of each lattice before and after electrochemical desorption were calculated using both STM images and voltammograms. Using this electrochemical process, high-resolution chemically patterned surfaces with application in areas ranging from microelectronics to biocompatible systems have been assembled and characterized with molecular precision.