Phase-pure TiO2 nanoparticles:: anatase, brookite and rutile
Phase-pure TiO2 nanoparticles:: anatase, brookite and rutile
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DOI：
10.1088/0957-4484/19/14/145605
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发表时间：
2008-04-09
期刊：
影响因子：
3.5
通讯作者：
Oskam, G.
中科院分区：
文献类型：
--
作者：
Reyes-Coronado, D.;Rodriguez-Gattorno, G.;Oskam, G.
我们报告的相位纯二氧化钛纳米粒子的合成在金红石，金红石和板钛矿结构，使用无定形二氧化钛作为一个共同的起始材料。通过在升高的温度下用适当的反应物进行水热处理来实现相形成。使用乙酸获得锐钛矿纳米颗粒，而使用不同浓度的盐酸获得纯相金红石和板钛矿纳米颗粒。的纳米材料，其特征在于使用X-射线衍射，紫外-可见反射光谱，动态光散射，和透射电子显微镜。我们建议，表面能的影响，金红石和板钛矿形成占主导地位的溶解-沉淀机制，六重协调钛配合物的链排列成不同的晶体结构，这取决于反应物的化学。水热条件下的颗粒生长动力学是由粗化和聚集-重结晶过程，允许控制平均纳米颗粒尺寸。
We report on the synthesis of phase-pure TiO2 nanoparticles in anatase, rutile and brookite structures, using amorphous titania as a common starting material. Phase formation was achieved by hydrothermal treatment at elevated temperatures with the appropriate reactants. Anatase nanoparticles were obtained using acetic acid, while phase-pure rutile and brookite nanoparticles were obtained with hydrochloric acid at a different concentration. The nanomaterials were characterized using x-ray diffraction, UV-visible reflectance spectroscopy, dynamic light scattering, and transmission electron microscopy. We propose that anatase formation is dominated by surface energy effects, and that rutile and brookite formation follows a dissolution-precipitation mechanism, where chains of sixfold-coordinated titanium complexes arrange into different crystal structures depending on the reactant chemistry. The particle growth kinetics under hydrothermal conditions are determined by coarsening and aggregation-recrystallization processes, allowing control over the average nanoparticle size.