Despite the widespread interest in the examinations of catalytic and facet-dependent properties of Cu₂O crystals, it was still difficult to grow ultrasmall Cu₂O cubes and octahedra with tunable sizes at a large scale. In this work, CuSO₄, NaOH, and sodium ascorbate of varying volumes were added to an aqueous sodium dodecyl sulfate (SDS) solution to generate Cu₂O nanocubes with average edge lengths of 16, 25, 29, 36, 51, 63, 72, and 86 nm in just 10 min. Another series of Cu₂O cubes with wide size tunability in the range of 27–200 nm is accomplished by simply adjusting the NaOH volume. Similar reaction conditions can also be used to make a large quantity of Cu₂O octahedra with opposite corner distances of just 34, 41, and 49 nm. Remarkably, production of these small Cu₂O cubes and octahedra is scalable to 500 mL in one reaction. UV–vis absorption and photoluminescence spectra establish their size and facet-dependent optical properties, and a modified band diagram of Cu₂O is presented. Recognizing Cu₂O nanocrystal shape evolution is possible by changing the cell potential, we have proven this concept to yield cubic to truncated octahedral and octahedral structures by varying the CuSO₄ volume. Finally, the tiny Cu₂O cubes and octahedra were pseudomorphically converted to Cu cubes and octahedra via the introduction of ammonia borane, so these small copper polyhedra become readily accessible for diverse catalytic and plasmonic applications.

中文翻译：

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可调整大小的可调谐合成的小尺寸Cu ₂ O纳米立方体和八面体，用于面依赖的光学表征和拟态转化成Cu纳米晶体。

尽管对检查Cu ₂ O晶体的催化性质和依赖于面的性质引起了广泛的兴趣，但是仍然难以大规模地生长具有可调尺寸的超小Cu ₂ O立方体和八面体。在这项工作中，硫酸铜₄，NaOH和不同体积的抗坏血酸钠加入到含水十二烷基硫酸钠（SDS）溶液，以产生的Cu ₂ ö纳米立方体与16的平均边长，25，29，36，51，63，在短短10分钟内达到72和86 nm。只需调节NaOH的量，即可完成另一系列的Cu ₂ O立方体，其尺寸可调性在27-200 nm之间。类似的反应条件也可用于生产大量的Cu ₂O八面体的相对角距仅为34、41和49 nm。值得注意的是，这些小的Cu ₂ O立方体和八面体的产量可在一次反应中扩展至500 mL。紫外可见吸收光谱和光致发光光谱确定了它们的尺寸和面相关的光学性质，并给出了Cu ₂ O的改进能带图。认识到通过改变电池的电势可以实现Cu ₂ O纳米晶体形状的演化，我们已经证明了该概念可以通过改变CuSO _4的体积产生立方到截短的八面体和八面体结构。最后，微小的Cu ₂O立方和八面体通过引入氨硼烷而被拟态转化为Cu立方和八面体，因此这些小的铜多面体变得易于用于各种催化和等离激元应用。