title: Synthesis and luminescence mechanism of multicolor-emitting g-C3N4 nanopowders by low temperature thermal condensation of melamine.
abstract: Graphite like C3N4 (g-C3N4) was synthesized facilely via the low temperature thermal condensation of melamine between 300-650°C. The results showed that the products maintained as melamine when the temperature is below 300°C. With the increase of temperature, the products were transformed into carbon nitride and amorphous g-C3N4 successively. The morphology of products was changed from spherical nanoparticles of melamine into layer carbon nitride and g-C3N4 with the increase of temperature. The photoluminescence spectra showed that the carbon nitride products have continuous tunable photoluminescence properties in the visible region with increasing temperature. With the help of steady state, transient state time-resolved photoluminescence spectra and Raman microstructural characterization, a novel tunable photoluminescence mechanism was founded systematically, which is mainly related to the two dimensional π-conjugated polymeric network and the lone pair of the carbon nitride.
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, PR China.
authors.forename: Yuanhao
authors.initials: Y
authors.lastname: Zhang
authors.forename: Qiwen
authors.initials: Q
authors.lastname: Pan
authors.forename: Guanqi
authors.initials: G
authors.lastname: Chai
authors.forename: Minru
authors.initials: M
authors.lastname: Liang
authors.forename: Guoping
authors.initials: G
authors.lastname: Dong
authors.forename: Qinyuan
authors.initials: Q
authors.lastname: Zhang
authors.forename: Jianrong
authors.initials: J
authors.lastname: Qiu
mesh_terms: D006108:Graphite / Q000138:chemical synthesis*; D049449:Luminescence; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology; D009570:Nitriles / Q000737:chemistry*; D055668:Photochemical Processes; D011208:Powders; D013696:Temperature; D014227:Triazines / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D009570:Nitriles; D011208:Powders; D014227:Triazines; C011206:cyanogen; D006108:Graphite; C011907:melamine