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Molecular Self-assembly At A Pre-formed Langmuir-Blodgett Template

H. Byrd, S. Whipps, John K. Pike, D. Talham
Published 1994 · Materials Science

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Abstract The use of a Langmuir-Blodgett monolayer as a template for subsequent self-assembly of organic molecules from solution has been investigated. The template is formed by transferring a monolayer of octadecylphosphonic acid to a hydrophobic substrate and then binding Zr4+ ions to the surface from solution. The asymmetric methylene (va(CH2)) band of the template layer appears at 2918 cm−1 and possesses a full width at half-maximum of 20 cm−1 indicating that an all-trans close-packed template is formed. X-ray photoelectron spectroscopy (XPS) analysis of the template layer shows a 1:1 ratio of Zr:P. Octadecylphosphonic acid, 1,10-decadediyldiphosphonic acid (DDPA) and quaterthiophenediphosphonic acid (QDP) have been self-assembled to the template and characterized by attenuated total reflection-Fourier transform IR, XPS and UV-visible techniques. Octadecylphosphonic acid self-assembles to the zirconium template and produces a well-ordered close-packed film as followed by IR analysis. Multilayers of DDPA have been assembled to the template layer; however, the increase in the integrated area of the va(CH2) band is not linear with the number of DDPA layers assembled. A rigid diphosphonic acid molecule such as QDP has also been assembled one layer at a time to the template. A plot of UV-visible absorbance vs. the number of layers of QDP shows a linear increase in absorbance after each QDP deposition step.
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