Institut Jean Lamour, UMR 7198-CNRS, Université de Lorraine, Nancy, F-54000, France.
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang, 621010, China.
Sci Rep. 2017 Sep 11;7(1):11122. doi: 10.1038/s41598-017-10540-6.
In this work, we report the self-assembled growth of vertically aligned columnar CuO + CuO nanocomposite thin films on glass and silicon substrates by reactive sputtering at room temperature. Microstructure analyses show that each phase in nanocomposite films has the columnar growth along the whole thickness, while each column exhibits the single phase characteristics. The local epitaxial growth behavior of CuO is thought to be responsible for such an unusual microstructure. The intermediate oxygen flow rate between those required to synthesize single phase CuO and CuO films produces some CuO nuclei, and then the local epitaxial growth provides a strong driving force to promote CuO nuclei to grow sequentially, giving rise to CuO columns along the whole thickness. Lower resistivity has been observed in such kind of nanocomposite thin films than that in single phase thin films, which may be due to the interface coupling between CuO and CuO columns.
在这项工作中，我们通过室温反应溅射法在玻璃和硅衬底上报告了垂直排列的柱状 CuO + CuO 纳米复合材料薄膜的自组装生长。微观结构分析表明，纳米复合材料薄膜中的每个相都沿着整个厚度呈柱状生长，而每个柱状物都表现出单相特性。CuO 的局部外延生长行为被认为是导致这种异常微观结构的原因。在合成单相 CuO 和 CuO 薄膜所需的中间氧气流之间会产生一些 CuO 核，然后局部外延生长提供了强大的驱动力，促使 CuO 核沿着整个厚度依次生长，从而形成 CuO 柱。与单相薄膜相比，这种纳米复合材料薄膜具有更低的电阻率，这可能是由于 CuO 和 CuO 柱之间的界面耦合。
