Crystal growth and contral of nano-level zinc alloy electrodeposits

研究了二氧化钛、二氧化硅和链状二氧化硅颗粒在原子水平上的复合电沉积。二氧化硅掺入机理；本文研究了锌镀层(001)η的宏观台阶横向生长。本文报道了50nm二氧化硅颗粒在(00 1)η锌镀层上的掺入机理。二氧化硅颗粒在(00 l)η处可分为无序析出相和有序析出相。随机沉淀物通过在初始吸收位置的单原子高度台阶从其底部被捕获。宏观台阶边缘的有序析出物是从宏观台阶的侧壁捕获的。此外，我们在电镀层内部的断裂表面上观察到许多二氧化硅颗粒。二氧化钛的掺入机理；二氧化钛颗粒由直径为10nm的小颗粒和直径为50nm的大颗粒组成。50nm较大的颗粒可分为(00 1)η处的无序析出和宏观台阶边缘的有序析出。10nm的小颗粒在(00 1)η上随机析出。这些较小的粒子在它们最初的吸收位置被单原子高度的台阶从它们的底部捕获。在电沉积的初始阶段，只有较小的颗粒被捕获。链状二氧化硅颗粒的掺入机理；讨论了链式二氧化硅颗粒的掺入机理，即多二氧化硅颗粒形成链。链状颗粒可分为(00 1)η处的随机析出和宏观阶边处的有序析出。随机链状预沉淀通过其初始吸收位置的单原子高度台阶从其底部被捕获。宏观台阶边缘的有序链状沉淀物是从宏观台阶的侧壁捕获的。此外，我们还观察到链状粒子随机粘附在(10 0)η上。

Atomic level composite electrodeposition has been investigated with Titania, Silica and chained Silica particles.1.Incorporation mechanism with Silica ; The author has been investigated the macrostep lateral growth on (00 1)η of zinc electrodepoists. In this investigation, an incorporation mechanism of Silica particles of 50nm on (00 1)η of zinc electrodepoistsis is reported. Silica particles can be classified with random precipitates on the (00 l)η and ordered precipitates at the macrostep edge. The random precipitates are trapped form their bottom by single atomic height steps at the initial absorbed sites. The ordered precipitates at the macrostep edges are trapped from sidewall of macrosteps. Also, we observed many Silica particles on fractured surfaces which are inside of the electrodeposits.2.Incorporation mechanism with Titania ; The titania particles consist of 10nm diameter smaller particles and 50nm larger particles. 50nm larger particles can be classified with random precipitates on the (00 1)η and ordered precipitates at the macrostep edge. 10nm smaller particles randomly precipitates on the (00 1)η. These smaller particles are trapped form their bottom by the single atomic height steps at their initial absorbed sites. At the initial stage of electrodeposition, only smaller particles are trapped.3.Incorporation mechanism with chained Silica particles ; Incorporation mechanism of chained Silica particles, multiple Silica particle forming chain, is discussed. The chained particles can be classified with random precipitates on the (00 1)η and ordered precipitates at the macrostep edge. The random chained preoipitates are trapped form their bottom by the single atomic height steps at their initial absorbed sites. The ordered chained precipitates at the macrostep edges are trapped from sidewall of macrosteps. Also, we observed chained particles randomly sticking on the (10 0)η.