硫代乙酰胺体系电沉积法制备CdS纳米膜

Preparation of CdS Nanoparticle Film by Electrodeposition in CH_3CSNH_2 System

CdS是典型的Ⅱ～Ⅵ族半导体,由于它在光催化[1]、光电转换[2]、光化学转换[3]方面表现出诱人的应用前景,因而CdS半导体材料的制备和表征一直受到人们关注.硫化镉半导体材料的用途不同,制备体系一般也不同,主要包括硫代乙酰胺体系[4]、硫代硫酸盐体系[5]、二硫化碳体系[6]、硫氰酸盐体系[7]、硫脲体系[8]、单质硫的有机溶剂体系[9]等.

The film of surface active agents spread out on the surface of the electrolyte of Thioacetamide and cadmium chloride. US nanofilm was deposited at the interface of surface active agents and electrolyt by the method of electrodeposition. The optimal conditions on which the nanofilm was prepared of the least crystals and uniform particles could be attained via analytical results of L-16(4(5)) orthogonal experiments. The optimal conditions: castor oil/hexadecanoll 0.06 mL.cm(-2),CdCl2/CH3CSNH2 4 mmol.L-1, cell voltage 5 V, electrodeposition temperature 15 degreesC. The effects on the grain size of temperature, surface-active agent, electrodyte concentration, cell voltage and pH become smaller in the series. If the temperature was high, the movement of molecules of surface-active agent and electrodyte would be faster, thus the preparation of the film would be difficult. The grain size of thinfilm varied with the surface-active agents, however, when the amount of surface-active agents reached a certain value, the grain size would remain unchanged. The higher the electrodyte concentration, the larger the grain size of nanofilm. The surface forms were changed at the same time. If the pH of the electrodyte was higher or lower, nanofilm could not be prepared successfully, thus the pH range should be is 3similar to6. SEM image of the nanofilm shows the occurance of dendrite. The sucessful preparation of nanofilm is closely related to the nature of surface activre agent due to the nanofilm growth mechanism.