Triazine-based graphitic carbon nitride: a two-dimensional semiconductor.
By G. Algara-Siller, N. Severin, S. Chong, Torbjörn Björkman, R. Palgrave, Andrea Laybourn, Markus Antonietti, Y. Khimyak, A. Krasheninnikov, J. Rabe and 4 more. Angewandte Chemie, 2014
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Graphitic carbon nitride has been predicted to be structurally analogous to carbon-only graphite, yet with an inherent bandgap. We have grown, for the first time, macroscopically large crystalline thin films of triazine-based, graphitic carbon nitride (TGCN) using an ionothermal, interfacial reaction starting with the abundant monomer dicyandiamide. The films consist of stacked, two-dimensional (2D) crystals between a few and several hundreds of atomic layers in thickness. Scanning force and transmission electron microscopy show long-range, in-plane order, while optical spectroscopy, X-ray photoelectron spectroscopy, and density functional theory calculations corroborate a direct bandgap between 1.6 and 2.0 eV. Thus TGCN is of interest for electronic devices, such as field-effect transistors and light-emitting diodes.
Subfields: Materials Chemistry
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