柔性不锈钢基底上一维TiO_2纳米线薄膜的制备及表征

采用直流磁控溅射的方法在柔性不锈钢基底(50μm)上沉积纯钛薄膜,后在NaOH碱溶液中经水热法制备了非钛基大长径比的一维TiO2纳米线薄膜,并通过场发射扫描电子显微镜(FESEM)、X射线衍射(XRD)、透射电子显微镜(TEM)以及光电化学的方法对不锈钢基一维TiO2纳米线薄膜进行了表征.结果表明,纯钛薄膜的致密度、结晶性能以及与基底的结合强度均随衬底温度的升高而加强;在10mol·L-1NaOH浓度下,生长一维TiO2纳米线结构的适宜温度为130-150℃;TiO2纳米线长度达到几个微米,直径在10-30nm之间,并且相互交叉生长,构成一个三维网络结构.此外,在Na2SO4溶液中对TiO2纳米线薄膜进行了线性扫描和瞬态光电流测试,结果表明,一维TiO2纳米线薄膜电极较TiO2纳米颗粒电极表现出更优异的光电化学性能.这种磁控溅射与水热反应相结合的方法,为非钛异质基底上制备一维TiO2纳米线薄膜提供了新的思路.

Preparation and Characterization of One-Dimensional TiO2 Nanowire Films on a Flexible Stainless Steel Substrate

We synthesized a one dimensional (1D) TiO₂ nanowire with a large aspect ratio on non-Ti substrate in NaOH aqueous solution by the hydrothermal treatment of pure titanium films deposited by direct current magnetron sputtering on a flexible stainless steel substrate (50 μm). The samples were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and photoelectro- chemical methods. Results show that the density and crystallinity of the titanium film as well as the binding strength between the Ti film and the stainless steel substrate increased with an increase in substrate temperature. The optimum hydrothermal temperature for the formation of the 1D TiO₂ nanowire was 130-150 ℃when the concentration of NaOH was kept at 10 mol·L^-1. TiO₂ nanowires with diameters of 10-30 nm and lengths of up to several microns grow in a crosswise manner and form a 3D network structure. Moreover, linear sweep voltammetry and transient photocurrent response curves indicated that the 1D TiO₂ nanowire film electrode had better photoelectrochemical performance than the TiO₂ nanoparticle electrode. This technique provides a new method for the fabrication of 1D TiO₂ nanowire films on different non-Ti heterogeneous substrates.