染料敏化的TiO2纳米管薄膜的光电浸润性

采用阳极氧化法在钛箔表面制备TiO2纳米管阵列, 并在其表面修饰N3染料(Ruthenium dye)作敏化剂, 用氟硅烷来提高表面疏水性, 获得超疏水薄膜. SEM测定结果表明, 纳米管薄膜具有各向异性浸润结构, 同时阳极氧化的非均匀性增加了表面的粗糙度. UV-Vis吸收光谱及电化学阻抗谱结果表明, 薄膜具有优异的光电性能. 通过施加超过一定阈值的电压, 液滴在薄膜表面由超疏水状态转变为亲水状态. 利用光电协同激励作用时, 阈值电压比单独使用电激励时降低了10 V, 这是使用高效的N3染料光电敏化层的结果.

Optoelectrowetting on Dye Sensitized TiO2 Nanotube Film

Controlling of surface wetting behavior has attracted much attention because of their potential applications. In this work, the intelligent surface of N3 sensitized TiO2 nantube arrays was designed and constructed for optoelectrically cooperative conversion at low critical voltage.  Large-scale hexagonal packing TiO2 nanotube arrays on Ti substrate were fabricated by anodic oxidation method with the average length of 8  μm and inner diameter of about 120 nm.  N3 dyes(Ruthenium dye) were modified on TiO2 nanotubes surface to improve photosensitivity of the composited surface in visible light region.  Fluoroalkyl silane(FAS) was further modified on composite film to improve the surface hydrophobicity with the initial contact angle about 150°. The optoelectrically cooperative wettability conversion of modified TiO2 nanotube was obtained at critical voltage of 10 V, which was reduced by 10 V when only electrical stimulus was used.  The usage of effective N3 dye as photoelectrically sensitive layer and nanotube film with anisotropic wetting behavior resulted in this improvement, which would offer valuable information to the associated research.