Preparation of Metallic Films at the Interface between Two Liquid Phases

在适当的实验条件下，通过在有机液体和金属盐水溶液之间的界面上阴极还原金属离子，可以获得二维金属沉积。详细研究了金属种类及其浓度、有机液体、温度、外加电压和电流对镀层形貌的影响。结果得到了锌、钴、铜、银和金的薄膜沉积，在界面张力较高、温度高于室温、外加电压较低的有机液体的界面上有利于薄膜的生长。阴极是漂浮在界面上的铝箔，其一端连接到旋转滚筒上。阳极与阴极垂直放置。计算机控制的步进电机将沿界面生长的薄膜连续滚动到鼓上。这种技术的主要优点是：无需使用任何衬底即可获得金属薄膜，并且薄膜的晶体方向可控。

Two-dimentional metal deposits can be obtained by the cathodic reduction of metal ions at an interface between an organic liquid and an aqueous solution of the metal salt under appropriate experimental conditions. The effect of metallic species and its concentration, organic liquid, temperature, applied voltage and current on the morphology of the deposit was studied in detail. As a result, filmy deposits of zinc, cobalt, copper, silver and gold were obtained ; filmy growth was favored at the interface with an organic liquid having high interfacial tension, at high temperatures than room temperature and at relatively low applied voltages.We then tried to continuously prepare metallic films as an application of above phenomenon. The cathode was an aluminum foil floating at the interface, one end of which was connected to the rotating drum. The anode was positioned vertically to the cathode. A film growing along the interface was continuously rolled onto the drum by a computer-controlled stepping motor. The principal advantage of this technique are as follows : metallic films are easily obtainable without using any substate for deposition, and the crystal direction of the film can be controlled.