fig1

Figure 1. Synthesis and characterizations. (A) Schematic illustration for the synthetic process of the HCN and BCN; (B and C) TEM image and SAED pattern of the BCN after calcined melamine at 500 °C for 4 h; (D and E) TEM images of the HCN after calcined melamine at 500 °C for 2 h; (F) lattice profile, and (G) SAED pattern of TCN and BCN. HCN: Crystallized carbon nitride homojunction; BCN: bulk phenazine-based C₃N₄; TEM: transmission electron microscopy; SAED: selected area electron diffraction; TCN: triazine-based C₃N₄.