AVS 46th International Symposium
    Nanometer-scale Science and Technology Division Monday Sessions
       Session NS-MoM

Paper NS-MoM9
Nanometer-scale Science of Conjugated Polymer Interfaces

Monday, October 25, 1999, 11:00 am, Room 6C

Session: Nanotechnology
Presenter: A.R. Burns, Sandia National Laboratories
Authors: A.R. Burns, Sandia National Laboratories
R.W. Carpick, Sandia National Laboratories
D.Y. Sasaki, Sandia National Laboratories
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Highly-ordered organic films with integrated conjugated backbones and functionalized tail groups have considerable promise in several areas of nanometer-scale science and technology, especially sensor development. This technology brings together synthetic strategies, self-assembly and Langmuir-Blodgett deposition, and scanning probe characterization of both structural and optical responsivities. Specifically, we will discuss recent developments in the preparation and analysis of polydiacetylene monolayers on silica and mica substrates. As confirmed by atomic force microscopy and fluorescence microscopy, the monolayers consist of domains of linearly oriented conjugated backbones with pendant hydrocarbon side chains above and below the backbones. The backbones impose anisotropic packing of the hydrocarbon side chains which leads to a 300% friction force anisotropy. Phase transitions of the polymer induced by localized mechanical strain or chemical binding will also be discussed in terms of optical and morphological changes. Finally, we will discuss results concerning the incorporation of these polymers into three-dimensional nanocomposites. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under Contract DE-AC04-94AL85000.