Abstract Large-sized α-MoO3 nanoplates with 10−100 μm were synthesized by introduction of titanium tetra isopropoxide as TiO2 precursor in hydrothermal solution chemistry. During the hydrothermal synthesis, the TiO2 can be selectively deposited on the (001) facets of h-MoO3 hexagonal rods and on the (001) and/or (010) facet of α-MoO3 re-growing crystals due to the small lattice mismatch between them. Owing to the TiO2 passivation of the surface of h-MoO3 rods, the h-MoO3 rods are changed to MoO3 tubes because the h-MoO3 are dissolved from the inner part of the TiO2 passivated h-MoO3 rods. The TiO2-passivated (001) facets of h-MoO3 rods act as templates for the re-growth of α-MoO3 and consequently produced rectangle-shaped α-MoO3 nanoplates. Simultaneously, the TiO2 passivated on the (001) and/or (010) facet of the re-growing α-MoO3 crystals inhibits the preferred crystal growth to [001] direction and promoted the crystal growth to [100] direction, thereby yielding plate-shaped α-MoO3. The small α-MoO3 nanoplates and rectangle-shaped ones are further grown to larger nanoplates by attachment process and/or continuous growth.

中文翻译：

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TiO2辅助选择性小面钝化合成发光二维α-MoO3范德华晶体

摘要 在水热溶液化学中引入四异丙醇钛作为TiO2 前驱体，合成了10-100 μm 的大尺寸α-MoO3 纳米片。在水热合成过程中，由于小的晶格失配，TiO2 可以选择性地沉积在 h-MoO3 六方棒的 (001) 面上和 α-MoO3 再生长晶体的 (001) 和/或 (010) 面上它们之间。由于 h-MoO3 棒表面的 TiO2 钝化，h-MoO3 棒从 TiO2 钝化的 h-MoO3 棒内部溶解，因此 h-MoO3 棒变为 MoO3 管。h-MoO3 棒的 TiO2 钝化 (001) 面作为 α-MoO3 再生长的模板，因此产生了矩形的 α-MoO3 纳米片。同时地，再生长的α-MoO3晶体的（001）和/或（010）面上钝化的TiO2抑制了优选的晶体向[001]方向的生长并促进了晶体向[100]方向的生长，从而产生了板状α-MoO3。小的 α-MoO3 纳米片和矩形纳米片通过附着过程和/或连续生长进一步生长成更大的纳米片。