A Novel Method for Synthesis of Titania Nanotube Powders using Rapid Breakdown Anodization
A Novel Method for Synthesis of Titania Nanotube Powders using Rapid Breakdown Anodization
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DOI：
10.1021/cm900410x
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发表时间：
2009-05-12
影响因子：
8.6
通讯作者：
Sekino, Tohru
中科院分区：
文献类型：
--
作者：
Fahim, Narges F.;Sekino, Tohru
本论文描述了一种利用快速阳极氧化快速合成高质量、高长径比、坚固的二氧化钛纳米管粉末的新方法。TiO 2纳米管粉末，具有约40 nm的典型纳米管外径、约8-15 nm的壁厚和约10-35 μ m的长度，在0.3 M NaCl或0.1 M HClO 4的水溶液电解质中，在20 V的外加电位下，通过钛箔的恒电位快速击穿阳极氧化合成。高反应性和高反应速率是基础导致TiO 2纳米管周期性地释放到溶液中并形成TiO 2纳米管的白色沉淀。反应产率约为4-6 g，在不到3 h的时间内，基于实验室规模生产，材料的近似成本为3.50美元/g。各种表征技术，包括FESEM，HRTEM，EDX，XRD，XPS，FT-IR，UV-可见漫反射，和NZ吸附，已被用于探测的形态，微观结构，晶体，组合物，键配置，光学性能，和表面积的纳米管。XPS和EDX研究表明，在NaCl/磷酸盐电解质溶液中形成的纳米管含有大量的磷物种，这强烈影响TiO 2的结晶和相变。也就是说，掺入磷酸盐的纳米管稳定了金红石相，并且在退火温度>= 700 ℃时观察到金红石相的起始。所得纳米管粉末具有显著水平的OH基团，带隙范围为3.04至3.23 eV。我们的研究结果表明，快速击穿阳极氧化是高效的高品质的二氧化钛纳米管粉末的生产，这使得它成为一种替代有据可查的传统方法。
The present paper describes a new method utilizing rapid anodization to quickly synthesize high-quality, high aspect ratio, robust titanium dioxide nanotube powders. TiO2 nanotube powders, With a typical nanotube outer diameter of approximately 40 nm, wall thickness of approximately 8-15 nm, and length of about 10-35 mu m, were synthesized by potentiostatic rapid breakdown anodization of titanium foils in aqueous electrolytes of 0.3 M NaCl or 0.1 M HClO4 under an applied potential of 20 V. High reactivity and ultrahigh reaction rate are cornerstones responsible for periodic release of TiO2 nanotubes into solution and formation of a white precipitate of TiO2, nanotubes. The reaction yield is approximately 4-6 g in less than 3 h, and the approximate cost of the material is $3.50/g, based on the laboratory-scale production. Various characterization techniques, including FESEM, HRTEM, EDX, XRD, XPS, FT-IR, UV-visible diffuse-reflectance, and NZ adsorption, have been used to probe morphology, microstructure, crystallographic, composition, bond configuration, optical properties, and surface area of the nanotubes. XPS and EDX investigations show that nanotubes formed in NaCl/phosphate electrolyte solutions contain a significant amount of phosphorus species, which strongly affects crystallization and phase transformation of TiO2. Namely, phosphate-incorporating nanotubes stabilized the anatase phase, and initiation of the rutile phase was observed at annealing temperatures >= 700 degrees C. The resulting nanotube powders have a significant level of OH groups with a band gap ranging from 3.04 to 3.23 eV. Our results indicate that rapid breakdown anodization is highly efficient in the production of good-quality TiO2 nanotube powders, which makes it an alternative to well-documented conventional methods.