科研之友
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摘要
Layers of well-developed crystals of Ta3N5 were successfully fabricated on Ta substrates by using a novel flux coating method in a flow of NH3. Theflux coating method is a simple one: the Ta substrates were coated with aqueous solutions of sodium compounds (=fluxes) and subsequently heated in a flow of NH3, whereupon the surfaces of the Ta substrates were dissolved in the flux, resulting in Ta3N5 crystal layers. The Ta in Ta3N5 was provided by the substrate. Therefore, crystal layers with good adhesion could be grown directly on the substrates. The shape of the individual crystals as well as the surface morphology of the layers formed was determined by the flux used. The crystals fabricated using NaCl-Na2CO3 as the flux were prismatic and had relatively smooth faces, covering the surface of the Ta substrate uniformly. The crystal growth field resulting from the use of this method yielded well-formed crystals, which presumably grew from a solution. Finally, it was confirmed that a thus-synthesized Ta3N5 crystal layer modified using Co-Pi as the co-catalyst generated a photoanodic current under visible-light irradiation.
- 出版日期2015
