Advanced Functional Materials

Cover image for Vol. 25 Issue 15

23_48/2013Hybrid Nanowires: Vertically Aligned Hybrid Core/Shell Semiconductor Nanowires for Photonics Applications (Adv. Funct. Mater. 48/2013)

Single-crystal organic nanowires are fabricated and covered by an inorganic wide-bandgap semiconducting shell via chemical vapor deposition. The wires are vertically aligned by A. Borras and co-workers and supported on processable substrates. This method is widely applicable to a range of materials. The waveguide effect on the fluorescence emission of the organic cores and their application as nanoscale waveguides in the 550–750 nm range are explored on page 5981 using perylene and ZnO.

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23_48i/2013Porous Materials: Massive Anisotropic Thermal Expansion and Thermo-Responsive Breathing in Metal–Organic Frameworks Modulated by Linker Functionalization (Adv. Funct. Mater. 48/2013)

Alkoxy-functionalized porous metal–organic frameworks show extreme anisotropic thermal expansion and can reversibly switch between narrow and large pore forms. Flexible alkoxy chains are covalently attached to the crystalline scaffold but exhibit conformational flexibility. The substituents can be viewed as immobilized guests whose thermally induced vibrations trigger a structural response of the entire framework. The detailed thermo-mechanical response of these materials is fine-tuned by S. Henke, A. Schneemann, and R. A. Fischer on page 5990.

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23_48b/2013Liquid Crystals: Controlled Planar Alignment of Discotic Liquid Crystals in Microchannels Made Using SU8 Photoresist (Adv. Funct. Mater. 48/2013)

An optical micrograph taken by R. J. Bushby and co-workers using crossed polarizers shows a thin film of 1,4,8,11,15,18,22,25-octaoctylphthalocyanine in its columnar rectangular liquid crystal phase at 100 °C. In such thin, open-to-the-air films, the columns are aligned in-plane but follow random sweeping lines. However, when open-to-the-air films are confined within micrometer-scale channels formed from SU8, all of the columns are aligned and point in the same direction, as shown on page 5997.

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