Oriented single crystalline titanium dioxide nanowires
Oriented single crystalline titanium dioxide nanowires
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DOI：
10.1088/0957-4484/19/50/505604
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发表时间：
2008-12-17
期刊：
影响因子：
3.5
通讯作者：
Aydil, E. S.
中科院分区：
文献类型：
--
作者：
Liu, B.;Boercker, J. E.;Aydil, E. S.
报道了在钛箔上制备定向单晶二氧化钛纳米线阵列。该合成方法依赖于通过新型碱水热生长工艺在钛箔上生长单晶钛酸钠（Na 2 Ti 2 O 5中心点H2O）纳米线的能力。在生长之后，Na 2 Ti 2 O 5中心点H2O纳米线通过离子交换反应转化为质子化的双钛酸盐（H2 Ti 2 O 5中心点H2O）纳米线，而不改变它们的形态或晶体结构。最后，质子化的钛酸双酯纳米线转化为单晶xTiO 2纳米线，通过煅烧的拓扑变换。这三个顺序步骤产生了2-50 μ m长的单晶纳米线的毯，其在[100]方向上取向并且主要垂直于钛箔。甚至可以生长更长的纳米线。柔性钛衬底上的单晶TiO 2纳米线阵列可用于光催化和光伏器件，如染料敏化太阳能电池，并可通过提供快速电子传输来增强其性能。纳米线也可以用作模板，用于产生分级纳米结构，例如在其外围用纳米颗粒装饰的纳米线或具有由纳米颗粒制成的壁的纳米管。
We report the synthesis of oriented single crystalline titanium dioxide (TiO2) nanowire arrays on titanium foil. The synthesis method relies on the ability to grow single crystal sodium titanate (Na2Ti2O5 center dot H2O) nanowires on titanium foil through a novel alkali hydrothermal growth process. Following growth, the Na2Ti2O5 center dot H2O nanowires are converted to protonated bititanate (H2Ti2O5 center dot H2O) nanowires through an ion-exchange reaction without changing their morphology or crystal structure. Finally, the protonated bititanate nanowires are converted to single crystalline anatase TiO2 nanowires through a topotactic transformation by calcination. These three sequential steps yield a carpet of 2-50 mu m long single crystalline nanowires oriented in the [100] direction and primarily normal to the titanium foil. Even longer nanowires can be grown. The single crystal TiO2 nanowire arrays on flexible titanium substrate may be used in photocatalytic and photovoltaic devices such as dye-sensitized solar cells and may enhance their performance by providing fast electron transport. The nanowires can also be used as templates for producing hierarchical nanostructures such as nanowires decorated with nanoparticles on their periphery or nanotubes with walls made of nanoparticles.