Arrays of Aligned Supramolecular Wires by Macroscopic Orientation of Columnar Discotic Mesophases
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- 作者：Hatice Duran ; Brigitte Hartmann-Azanza ; Martin Steinhart ; Dominik Gehrig ; Fr茅d茅ric Laquai ; Xinliang Feng ; Klaus M眉llen ; Hans-J眉rgen Butt ; George Floudas
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：November 27, 2012
- 年：2012
- 卷：6
- 期：11
- 页码：9359-9365
- 全文大小：429K
- 年卷期：v.6,no.11(November 27, 2012)
- ISSN：1936-086X
文摘
Structure formation, phase behavior, and dynamics of mono-bromo hexa-peri-hexabenzocoronene (HBC-Br) are strongly affected by the confinement of cylindrical nanopores with rigid walls. Using self-ordered nanoporous anodic aluminum oxide (AAO)-containing arrays of aligned nanopores with narrow size distribution as a confining matrix, pronounced alignment of the HBC-Br columns along the nanopore axes was found to be independent of the pore diameter. Hence, arrays of one-dimensional supramolecular HBC-Br wires with the columns uniformly oriented along the wire axes on a macroscopic scale were obtained, unlike with discotics bearing smaller cores. The formation of the crystalline herringbone structure is shifted to lower temperatures in nanopores with diameters of a few hundred nanometers, whereas the formation of this low-temperature phase is completely suppressed when the pore diameter is below 20 lattice parameters. Moreover, the cylindrical confinement affects the disk axial dynamics as well as the distribution of relaxation times.