中文摘要：

采用液相自组装法,Bi（NO3）3.5H2O,Fe（NO3）3.9H2O为原料,柠檬酸为螯合剂,以OTS单分子层为模板,在ITO玻璃基片上成功制备了BiFeO3晶态薄膜。研究了前驱液pH值对BiFeO3薄膜的影响。利用XRD,EDS和SEM等测试手段对在不同pH值下沉积的BiFeO3薄膜进行了表征。结果表明,由于Bi 3＋络合物比Fe3＋络合物的成核速率快,在pH值为1.5,Fe3＋/Bi3＋摩尔比为2.6时得到了纯相BiFeO3薄膜;随着pH值的增大,需要增大前驱液中Fe3＋/Bi 3＋摩尔比才能得到纯相BiFeO3薄膜;该工艺制备BiFeO3薄膜适宜的pH值范围为1.50～1.65,在这个范围内沉积的BiFeO3薄膜都很致密。

英文摘要：

OTS as stencil,BiFeO3 films were successfully prepared on ITO/glass substrates by liquid phase self-assembled method using Bi（NO3）3·5H2O,Fe（NO3）3·9H2O as raw materials and citrate acid as chelating agent.The influence of pH values of precursor solutions on BiFeO3 films was studied.The BiFeO3 films prepared under different pH values were characterized by XRD,EDS and SEM.The results indicated that：the nucleated rates of the chelates of Bi3＋ are larger than that of the Fe3＋,the pure phase BiFeO3 films could not obtained until the Fe3＋/Bi3＋ molar ratio was added to 2.6 when the pH value is 1.5;as the increase of the pH value,pure phase BiFeO3 films could not obtained until adjusting the Fe3＋/Bi3＋ molar ratio in precursor solutions;the proper pH values for the process are in the range of 1.50-1.65,the BiFeO3 films prepared in the range are all dense,grown well,the sizes of grains were well-distributed.