We introduce a facile fabrication process for ultrathin nitrogen-doped graphene quantum dot (NGQD) layers on TiO₂ nanoparticles in order to develop high-performance photocatalysts. NGQDs are grown either by graphitization of precursors or direct deposition of premade NGQDs. Photocatalytic performance is shown to be dependent on the thickness of NGQD layers and doping levels of C and N atoms on TiO₂ surfaces. The nanocomposites shown to absorb a broad range of visible light and narrow the bandgap by 0.38 eV, resulting in the increased density of photoinduced eletron-hole pairs and efficient charge separation at the interface between the NGQDs and TiO₂.

为了开发高性能的光催化剂，我们介绍了一种在TiO ₂纳米颗粒上的超薄氮掺杂石墨烯量子点（NGQD）层的简便制造工艺。NGQD通过前体的石墨化或预制NGQD的直接沉积来生长。已显示出光催化性能取决于NGQD层的厚度以及TiO ₂表面上C和N原子的掺杂水平。纳米复合材料显示可吸收大范围的可见光并将能带隙缩小0.38 eV，从而导致光致电子-空穴对密度增加，并在NGQD和TiO ₂之间的界面处实现有效的电荷分离。