We report a straightforward route for preparing bulk quantities of size-controlled and low size dispersity copper oxide nanoclusters on amorphous silica. Adsorption of the copper-dendrimer complex on the silica surface minimizes aggregation, which results in previously unachieved low size dispersity of the nanoclusters. Copper oxide nanoclusters with mean diameters of 1-5 nm with size dispersities of only 8-15% were prepared by calcination of silica impregnated with Cu(II)-poly(propylene imine) dendrimer complexes of varying stoichiometry. The size and size distribution of the copper oxide nanoparticles are tunably controlled by the ratio of the Cu(II) to the terminal primary amines in the copper-dendrimer complex, DAB-Am n -Cu(II) x , the surface coverage of the DAB-Am n -Cu(II) x , and the impregnation procedure. This method is anticipated to be useful in the preparation of other metal oxide nanoparticles, e.g., Ni and Fe, and with other oxide substrates.

中文翻译：

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二氧化硅上固定的氧化铜纳米团簇的尺寸选择合成。

我们报告了在无定形二氧化硅上制备大量尺寸受控和低尺寸分散性的氧化铜纳米簇的简单方法。铜-树状聚合物配合物在二氧化硅表面上的吸附使聚集最小化，这导致了纳米团簇以前无法实现的低尺寸分散性。通过煅烧不同化学计量比的Cu（II）-聚（丙烯亚胺）树枝状聚合物配合物的二氧化硅煅烧，可制得平均直径为1-5 nm，尺寸分散度仅为8-15％的氧化铜纳米簇。氧化铜纳米粒子的尺寸和尺寸分布可通过铜-树状大分子配合物DAB-Am n -Cu（II）x中Cu（II）与末端伯胺的比例来控制。 DAB-Am n -Cu（II）x以及浸渍程序。