三聚氰胺低温热缩聚合成多色发光 g-C3N4 纳米粉末及其发光机制。

Synthesis and luminescence mechanism of multicolor-emitting g-C3N4 nanopowders by low temperature thermal condensation of melamine.

机构信息

State Key Laboratory of Luminescent Materials and Devices, and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, PR China.

出版信息

Sci Rep. 2013;3:1943. doi: 10.1038/srep01943.

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.

石墨相氮化碳（g-C3N4）是通过在 300-650°C 温度范围内三聚氰胺的低温热缩聚反应简便地合成的。结果表明，当温度低于 300°C 时，产物保持为三聚氰胺。随着温度的升高，产物依次转化为氮化碳和无定形 g-C3N4。随着温度的升高，产物的形态从三聚氰胺的球形纳米粒子转变为层状氮化碳和 g-C3N4。光致发光光谱表明，氮化碳产物在可见光区域具有连续可调的光致发光性能，随着温度的升高而增加。借助稳态、瞬态时间分辨光致发光光谱和拉曼微结构表征，系统地发现了一种新的可调谐光致发光机制，主要与二维π共轭聚合物网络和氮化碳的孤对电子有关。