Figure 1 - Crystal structure and optical properties of graphitic carbon nitride.
From the following article
A metal-free polymeric photocatalyst for hydrogen production from water under visible light
Xinchen Wang, Kazuhiko Maeda, Arne Thomas, Kazuhiro Takanabe, Gang Xin, Johan M. Carlsson, Kazunari Domen & Markus Antonietti
Nature Materials 8, 76 - 80 (2009) Published online: 9 November 2008
doi:10.1038/nmat2317
a, Schematic diagram of a perfect graphitic carbon nitride sheet constructed from melem units. b, Experimental XRD pattern of the polymeric carbon nitride, revealing a graphitic structure with an interplanar stacking distance of aromatic units of 0.326 nm. c, Ultraviolet–visible diffuse reflectance spectrum of the polymeric carbon nitride. Inset: Photograph of the photocatalyst.
