Scalable Production of Nanographene and Doping via Nondestructive Covalent Functionalization.

Autor: Guday G; Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany., Donskyi IS; Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany.; BAM - Federal Institute for Material Science and Testing, Division of Surface Analysis and Interfacial Chemistry, Unter den Eichen 44-46, 12205, Berlin, Germany., Gholami MF; Department of Physics & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489, Berlin, Germany., Algara-Siller G; Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, 14195, Berlin, Germany., Witte F; Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany., Lippitz A; BAM - Federal Institute for Material Science and Testing, Division of Surface Analysis and Interfacial Chemistry, Unter den Eichen 44-46, 12205, Berlin, Germany., Unger WES; BAM - Federal Institute for Material Science and Testing, Division of Surface Analysis and Interfacial Chemistry, Unter den Eichen 44-46, 12205, Berlin, Germany., Paulus B; Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany., Rabe JP; Department of Physics & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489, Berlin, Germany., Adeli M; Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany.; Department of Chemistry, Faculty of Science, Lorestan University, Khorram Abad, 44316-68151, Iran., Haag R; Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2019 Mar; Vol. 15 (12), pp. e1805430. Date of Electronic Publication: 2019 Feb 18.
DOI: 10.1002/smll.201805430
Abstrakt: A new method for top-down, one-pot, gram-scale production of high quality nanographene by incubating graphite in a dilute sodium hypochlorite solution at only 40 °C is reported here. The produced sheets have only 4 at% oxygen content, comparable with nanographene grown by chemical vapor deposition. The nanographene sheets are covalently functionalized using a nondestructive nitrene [2+1] cycloaddition reaction that preserves their π-conjugated system. Statistical analyses of Raman spectroscopy and X-ray photoelectron spectroscopy indicate a low number of sp 3 carbon atoms on the order of 2% before and 4% after covalent functionalization. The nanographene sheets are significantly more conductive than conventionally prepared nanographene oxide, and conductivity further increases after covalent functionalization. The observed doping effects and theoretical studies suggest sp 2 hybridization for the carbon atoms involved in the [2+1] cycloaddition reaction leading to preservation of the π-conjugated system and enhancing conductivity via n-type doping through the bridging N-atom. These methods are easily scalable, which opens the door to a mild and efficient process to produce high quality nanographenes and covalently functionalize them while retaining or improving their physicochemical properties.
(© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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