O-Doped Carbon Nitride (O-g-C3N) with High Oxygen Content (11.1 mass%) Synthesized by Pyrolysis of Pyridine

Graphite-like carbon nitride (g-C3N4) is the most perspective material for nanosensors creation used in nanodimensional systems that aid in the chemical and biological protection of human health and environment. Carbon nitride has an extremely wide interval of region of homogeneity (0.55 < C/N <4.0), which makes it an unique object because of the doping of its structure by non-metal atoms with the purpose of essential expansion of its chemical and electronic characteristics. We developed a new method of pyridine pyrolysis with the purpose of obtaining O-doped graphite-like carbon nitride (О-g-C3N) with the high contents of oxygen (11.1 mass%). In the high-temperature (1050 °C) zone of reactor is realized mainly destruction of molecules C5H5N to formation of small carbon clusters (С2─С4) and HCN. Nanodispersed high-defected carbon nitride at the expense of polycondensation of molecules, HCN is formed in dynamic reactionary vapour-gaseous flow of all reactor, but is located only in the low-temperature (<70 °C) zone. From air valence-unsaturated atoms of carbon in resulting carbon nitride chemisorbs oxygen with formation of О-g-C3N. In mass spectra the products of thermolysis of synthesized O-g-С3N are detected cyanogen (C2N2), fragments C4N2 and C2N, as well as atoms of carbon and nitrogen.