知识与财富的链接
Ti基底三维微纳米结构TiO_2(3D-TiO_2)具有比表面积大、光捕获能力强、电荷传输快、可循环利用的优点,在光催化领域具有重要的研究意义和应用前景。采用飞秒激光刻蚀复合Na OH水热法制造Ti基底3D-TiO_2,并研究飞秒激光刻蚀的微阵列结构对3D-TiO_2光催化性能的影响。采用激光共聚焦显微镜(LSCM)、SEM、TEM、XRD对3DTiO_2进行表征分析,并对3D-TiO_2在紫外光照下进行甲基橙降解性能测试。结果表明,复合方法制备的3D-TiO_2由飞秒激光刻蚀的微阵列和Na OH水热法制备的TiO_2纳米线组成。与采用Na OH水热法直接在平整Ti表面制备的TiO_2纳米线相比,3D-TiO_2的染料吸附能力提升100%,光催化性能提升37%。微阵列结构尺寸对3D-TiO_2的性能具有明显影响,随着微阵列宽度的减小或高度的增加,3D-TiO_2的比表面积增大、入射光反射率降低、光催化性能提高。
The fabrication of three dimensional micro-nanostructured TiO2 (3D-TiO2) on Ti substrate for photocatalysis has attracted continued interests from both scientific research and industrial applications, mainly due to the structure-induced properties including large specific surface area, superior light harvesting capacity and prominent carrier mobility. 3D-TiO2 was fabricated through femtosecond laser ablation and NaOH hydrothermal treatment. The structure, morphology, and phase of 3D-TiO2 were examined by laser confocal scanning microscopy (LCSM), SEM, TEM and XRD. Results show that as-fabricated 3D-TiO2 is composed of microarrays and nanowires, fabricated by femtosecond laser ablation and NaOH hydrothermal treatment, respectively. The 3D-TiO2 exhibites enhanced performances in absorption ability and photocatalytic efficiency than TiO2 nanowires grown on flat Ti surface, which directly result in obvious improved photodegradation efficiency (100% and 37% increase for absorption ability and photocatalytic efficiency respectively). In addition, the width and depth of the femtosecond laser ablated microarrays significantly affect the photocatalytic performances of 3D-TiO2. The photocatalytic activity of 3D-TiO2 is improved with the decrease of width or increase of depth due to higher incident light harvesting capacity and large specific surface.
