Wan Wei, Sun Jia-Yi, Ye Shi, Zhang Qin-Yuan
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology Guangzhou 510641 China
RSC Adv. 2018 Jul 12;8(44):25057-25064. doi: 10.1039/c8ra04436h. eCollection 2018 Jul 9.
Graphitic carbon nitride (g-CN) has aroused broad interest in the field of photocatalysis and luminescence as a kind of metal-free semiconductor with a suitable band gap of ∼2.7 eV. The properties largely depend on the polymerization degree of g-CN. This research exploits the nanocages of zeolite-Y to confine the polymerization of the melamine monomer to form g-CN. The composites are achieved a facile two-step method, , melamine-Na ion exchange reaction in the cage of the zeolite and subsequent calcination. BET measurement and transmission electron microscopy (TEM) confirm that the g-CN is encapsulated in zeolite-Y, and the polymerization degree can be controlled by the melamine contents exchanged with Na in the cages of zeolite-Y. Photoluminescence and vibration spectroscopy also show the features of g-CN with different polymerization degrees in the zeolite-Y composites. This research gives a perspective of fabricating subnanoscale g-CN in porous zeolite, which may find potential applications in photocatalysis and optoelectronics.
石墨相氮化碳（g-CN）作为一种具有约2.7 eV合适带隙的无金属半导体，在光催化和发光领域引起了广泛关注。其性能很大程度上取决于g-CN的聚合度。本研究利用Y型沸石的纳米笼来限制三聚氰胺单体的聚合以形成g-CN。通过一种简便的两步法制备复合材料，即在沸石笼中进行三聚氰胺 - 钠离子交换反应，随后进行煅烧。BET测量和透射电子显微镜（TEM）证实g-CN被封装在Y型沸石中，并且聚合度可以通过与Y型沸石笼中钠离子交换的三聚氰胺含量来控制。光致发光和振动光谱也显示了Y型沸石复合材料中不同聚合度g-CN的特征。本研究为在多孔沸石中制备亚纳米级g-CN提供了一种思路，这可能在光催化和光电子学中找到潜在应用。
