抄録
Ta_3N_5 is one of the potential candidates for visible-light-driven photocatalyst in water splitting. In this study, Ta_3N_5 crystal layers were successfully fabricated on Ta substrates via two- and one-step processes including flux coating method. In two-step fabrication, high-quality nano-/microtextured NaTaO_3 crystal layers were directly fabricated on a Ta substrate by flux coating method using NaNO_3, and the NaTaO_3 crystal layers were subsequently transformed to Ta_3N_5 crystal layers by heating under NH_3 flow. The individual Ta_3N_5 crystals retained the original sizes and shapes of NaTaO_3 crystals but became highly porous after nitridation. In one-step fabrication, well-developed Ta_3N_5 crystals were directly grown on Ta substrates by heating under NH_3 with Na compounds. When Na_2CO_3-NaCl mixture was used as the flux, prism-like Ta_3N_5 crystals were uniformly grown.
