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Semifluorinated Alkylphosphonic Acids Form High-Quality Self-Assembled Monolayers on Ag-Coated Yttrium Barium Copper Oxide Tapes and Enable Filamentization of the Tapes by Microcontact Printing
journal contribution
posted on 2016-08-02, 00:00 authored by Chul Soon Park, Han Ju Lee, Dahye Lee, Andrew C. Jamison, Eduard Galstyan, Wanda Zagozdzon-Wosik, Herbert C. Freyhardt, Allan J. Jacobson, T. Randall LeeA custom-designed
semifluorinated phosphonic acid, (9,9,10,10,11,11,12,12,13,13,14,14,15,15,16,16,16-heptadecafluorohexadecyl)phosphonic
acid (F8H8PA), and a normal hexadecylphosphonic acid (H16PA) were
synthesized and used to generate self-assembled monolayers (SAMs)
on commercially available yttrium barium copper oxide (YBCO) tapes.
In this study, we wished to evaluate the effectiveness of these monolayer
films as coatings for selectively etching YBCO. Initial films formed
by solution deposition and manual stamping using a non-patterned polydimethylsiloxane
stamp allowed for a comparison of the film-formation characteristics.
The resulting monolayers were characterized by X-ray photoelectron
spectroscopy (XPS), contact angle goniometry, and polarization modulation
infrared reflection absorption spectroscopy (PM-IRRAS). To prepare
line-patterned (filamentized) YBCO tapes, standard microcontact printing
(μ-CP) procedures were used. The stamped patterns on the YBCO
tapes were characterized by scanning electron microscopy (SEM) before
and after etching to confirm the effectiveness of the patterning process
on the YBCO surface and energy-dispersive X-ray spectroscopy (EDX)
to obtain the atomic composition of the exposed interface.