WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
ACS Nano. 2010 Mar 23;4(3):1553-60. doi: 10.1021/nn100023h.
Cu-Cu2O core-shell nanoparticles (NPs) of different shapes over an extended nanosize regime of 5-400 nm have been deposited on a H-terminated Si(100) substrate by using a simple, one-step, templateless, and capping-agent-free electrochemical method. By precisely controlling the electrolyte concentration [CuSO4 x 5H2O] below their respective critical values, we can obtain cubic, cuboctahedral, and octahedral NPs of different average size and number density by varying the deposition time under a few seconds (<6 s). Combined glancing-incidence X-ray diffraction and depth-profiling X-ray photoelectron spectroscopy studies show that these NPs have a crystalline core-shell structure, with a face-centered cubic metallic Cu core and a simple cubic Cu2O shell with a CuO outerlayer. The shape control of Cu-Cu2O core-shell NPs can be understood in terms of a diffusion-limited progressive growth model under different kinetic conditions as dictated by different [CuSO4 x 5H2O] concentration regimes.
已通过一种简单、一步、无模板和无封端剂的电化学方法，在 H 终止的 Si(100)衬底上沉积了具有不同形状和扩展纳米尺寸（5-400nm）的 Cu-Cu2O 核壳纳米颗粒（NPs）。通过精确控制电解质浓度[CuSO4 x 5H2O]低于各自的临界值，我们可以通过在几秒钟（<6s）内改变沉积时间，获得不同平均尺寸和数密度的立方、立方八面体和八面体 NPs。掠入射 X 射线衍射和深度剖析 X 射线光电子能谱研究表明，这些 NPs 具有晶态核壳结构，具有面心立方金属 Cu 核和简单立方 Cu2O 壳，具有 CuO 外层。根据不同的[CuSO4 x 5H2O]浓度范围下的不同动力学条件，Cu-Cu2O 核壳 NPs 的形状控制可以用扩散限制的渐进生长模型来理解。
