Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, United States.
Nanoscale. 2013 Jul 21;5(14):6284-90. doi: 10.1039/c3nr01290e. Epub 2013 Jun 6.
Compared with Ag, Au, Pt and Pd, the synthesis of Cu nanocrystals that exhibit well-defined structures and surface properties has achieved limited success. Herein, we report an etching and protecting strategy to prepare Cu nanostructures with controllable shapes, crystalline nature and surface properties. In the developed strategy, the selective use of different additives is critical to the successful synthesis of the Cu nanocrystals: while NH4Cl (or hexadecyltrimethylammonium chloride (CTAC)) functions as an etchant by a Cl(-)-O2 pair that can selectively remove twinned nuclei and induce the formation of single nanocrystals with a cubic morphology, the addition of RuCl3 (or FeCl3, FeCl2) can protect the multiply twinned seeds from being etched, and leads to the formation of 5-fold twined nanowires. The controlling strategy reported herein is highlighted by its simplicity and versatility. By further increasing the reaction temperature and prolonging the reaction time, bimetallic CuRu nanotubes can be readily prepared. The applications of these well-defined nanostructures and the developed strategy in controlling other metals are currently under investigation.
与 Ag、Au、Pt 和 Pd 相比，合成具有明确结构和表面性质的 Cu 纳米晶体仅取得了有限的成功。在此，我们报告了一种刻蚀和保护策略，用于制备具有可控形状、晶体性质和表面性质的 Cu 纳米结构。在开发的策略中，选择性使用不同的添加剂对于成功合成 Cu 纳米晶体至关重要：虽然 NH4Cl（或十六烷基三甲基氯化铵（CTAC））作为蚀刻剂通过 Cl(-)-O2 对起作用，该对可以选择性地去除孪晶核，并诱导具有立方形态的单纳米晶体的形成，但 RuCl3（或 FeCl3、FeCl2）的添加可以保护多孪晶种子不被蚀刻，并导致 5 重孪晶纳米线的形成。所报道的控制策略的特点是简单和通用。通过进一步提高反应温度和延长反应时间，很容易制备出双金属 CuRu 纳米管。目前正在研究这些具有明确结构的纳米结构和开发的控制其他金属的策略的应用。
