Regensburg 2004 – scientific programme
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O: Oberflächenphysik
O 4: Organische Dünnschichten I
O 4.3: Talk
Monday, March 8, 2004, 11:45–12:00, H43
Growth of para-hexaphenyl microrings — •Frank Balzer1 and Horst-Günter Rubahn2 — 1Humboldt-Universität zu Berlin, Institut für Physik / ASP — 2SDU Odense, Fysisk Institut, Denmark
Recently we have shown, that on freshly cleaved mica the growth of mutually aligned fibers of para-hexaphenyl is favored because of a dipole-assisted self-assembly process [1]. Typical heights and widths of these fibers are in the range of a few ten to hundred nanometers, but lengths up to one millimeter can be obtained. However, altering the mica surface dipoles leads to the growth of para-hexaphenyl microrings instead of parallel fibers. These rings possess a narrow size distribution of a few micrometers in diameter with wall widths and heights of a few hundred nanometers. Polarized two-photon luminescence on single rings reveals that these rings resemble bent single crystalline fibers [2]. Possible applications of the microrings are discussed.
[1] F. Balzer and H.-G. Rubahn, Appl. Phys. Lett. 79 (2001) 3860.
[2] F. Balzer, J. Beermann, S.I. Bozhevolnyi, A.C. Simonsen, and H.-G. Rubahn, Nano Letters 3 (2003) 1311.