摘要
以NaOH为沉淀剂,用共沉淀法制备了纯相Bi2Fe4O9样品。扫描电镜观察发现Bi2Fe4O9晶粒为横截面近似呈正方形的亚微米棒,通过改变沉淀剂NaOH的量可以控制Bi2Fe4O9亚微米棒的尺寸,用透射电子显微镜确定出Bi2Fe4O9亚微米棒的横截面为(001),侧面为(110)和(110)。光电流测试结果表明,Bi2Fe4O9亚微米棒具有非常好的光电转换特性,其中长棒状的Bi2Fe4O9在可见光和模拟日光下的光电流分别是29.6和37.6μA/cm2。不同尺寸Bi2Fe4O9亚微米棒的光电流测试结果表明,其光电流大小与外露面的面积和光吸收能力有关,Bi2Fe4O9亚微米棒的长度越长产生的光电流越大。
Bi2Fe4 O9 powders were synthesized by a co precipitation method with the NaOH precipitator. Scanning electron microscopy （SEM） images exhibited that the transversal surface of Bi2Fe4O9 submicron rods were approximately square,and the size of the Bi2 Fe4O9 submicron rods were changed by controlling the amount of NaOH. Transversal facet （001） and flat side facets （110） and （110） were investigated by transmission electron microscope （TEM）. The test results of electrochemical workstation show that steady photocurrent of Bi2 Fe4O9 increase with the length of submicron rods, and the steady photocurrent of the longer submicron rods are 29.6 μA/cm^2 and 37.6μA/cm^2 under visible and UV-visible light irradiation.The photoeurrent of different-sized Bi2 Fe4O9 submicron rods indicate that the photocurrent is related to the exposed area and the photoabsorption of facets.
出处
《青岛大学学报（自然科学版）》
CAS
2013年第2期47-50,共4页
Journal of Qingdao University(Natural Science Edition)
