电压对TiO_2纳米管阵列形貌及光电性能的影响  

Influence of voltages on morphology and photoelectricity properties of TiO_2 nanotube arrays

作　　者：杨蕾[1,2] 徐凯[1] 石市委[1] 张苗[1] 宋学萍[1] 孙兆奇[1] 

机构地区：[1]安徽大学物理与材料科学学院,安徽合肥230601 [2]陆军军官学院物理教研室,安徽合肥230031

出　　处：《合肥工业大学学报（自然科学版）》2013年第5期539-542,598,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51272001;51072001);教育部留学归国人员中央部门专项资助项目

摘　　要：文章以电化学阳极氧化法在氟化铵、甘油电解液中制备了TiO2纳米管阵列,利用扫描电子显微镜观察了不同电压条件下制备样品的形貌。根据I-t曲线、I-V曲线及SEM图像讨论了TiO2纳米管阵列的生长进程和形成过程,并研究了样品的光电性能。结果表明:电压从25V升至55V时,管径、管长分别从40、2 000nm增至100、3 200nm;电压0.2V时,初始氧化层形成;电压升至1.4V,氧化层被击穿;氧化层的形成与场致溶解的相互影响导致在电压2～4V附近电流的起伏;电压大于5V时纳米管开始形成;25V与45V电压下制备的样品具有较好的光吸收和光电性能。TiO2 nanotube arrays were prepared by the electrochemical anodization of a titanium foil in NH4F and glycerol electrolyte. The anodization process was carried out at different voltage, and the morphology of the TiO2 nanotube was observed with SEM. The formation process of nanotube arrays was revealed by SEM, I-t curves and I-V curves, and the photoelectricity properties of the samples were studied. It is found that when the potential increases from 25 V to 55 V, the tube size and length rise from 40 nm and 2 000 nm to 100 nm and 3 200 nm respectively; when the potential is 0. 2 V, the initial oxide layer is formed; when the potential is up to 1.4 V, the TiO2 film dissolves; and as the potential is 2-4 V, the current curves exhibit oscillation, and this behavior can be ascribed to the simultaneous formation of corrosion pits and oxide layer; when the potential is up to 5 V, well-aligned TiO2 nanotube is formed. It is also found that the TiO2 nanotube arrays prepared at 25 V and 45 V have better light absorption and photoelectricity properties.

关 键 词：TIO2纳米管阵列 电化学阳极氧化法 光电性能 

分 类 号：TB383[一般工业技术—材料科学与工程]