Synthesis of conducting graphite-like nanometer wires via soluble precursors

Wu, Chun-Guey; Bein, Thomas; Beuneu, Francois und Esnouf, Stephane (1994): Synthesis of conducting graphite-like nanometer wires via soluble precursors. In: Polymer Preprints (American Chemical Society, Division of Polymer Chemistry), Bd. 35, Nr. 1: S. 323-324

Abstract

Graphite - like conducting materials were encapsulated in the channels of new mesoporous MCM- 41 materials with typical channel diameters of 30-40 Ä. Acrylonitrile was introduced into the hosts via vapor transport, then polymerized with external radical initiators, K2S2O8 and HNaSOß. The polymers in the host cavities were further pyrolyzed at different temperatures under vacuum or nitrogen atmosphere. The properties of the polymer systems were studied while encapsulated or after dissolution of the host. The crystallinity of the hosts is intact after insertion of the polymer (even after pyrolysis at 800°C). The formation of conducting graphite - like materials inside the hosts was demonstrated with Raman and UV spectra. The nitrogen to carbon ratio of the pyrolyzed polymers depends on the pyrolysis temperature and the polymer environment. Most interestingly, the normalized AC absorption of pyrolyzed polyacrylonitrile in MCM-41 (at 800°C) is comparable to graphite.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• Signatur: TUM:0306/CHE 700 POL 6(35
• Sprache: Englisch