Shape-Controlled Synthesis of Highly Crystalline Titania Nanocrystals
Shape-Controlled Synthesis of Highly Crystalline Titania Nanocrystals
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DOI：
10.1021/nn900940p
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发表时间：
2009-11-01
期刊：
影响因子：
17.1
通讯作者：
Do, Trong-On
中科院分区：
文献类型：
--
作者：
Dinh, Cao-Thang;Nguyen, Thanh-Dinh;Do, Trong-On
提出了一种基于溶剂热技术的多用途合成方法，用于制备不同形状的TiO2纳米晶体，如菱形、截断菱形、球形、狗骨形、截断和细长菱形和条形。我们的方法的核心特点是使用水蒸气作为水解剂来加速反应，并使用油酸和油胺作为两种不同的表面活性剂，它们具有不同的结合强度来控制TiO2纳米颗粒的生长。我们还表明，适量的水蒸气以及所需的油酸/油胺摩尔比在控制TiO2纳米晶体的尺寸和形状方面起着关键作用。
A versatile synthetic method based on solvothermal technique has been developed for the fabrication of TiO2 nanocrystals with different shapes such as rhombic, truncated rhombic, spherical, dog-bone, truncated and elongated rhombic, and bar. The central features of our approach are the use of water vapor as hydrolysis agent to accelerate the reaction and the use of both oleic acid and oleylamine as two distinct capping surfactants which have different binding strengths to control the growth of the TiO2 nanoparticles. We also show that the presence of an appropriate amount of water vapor along with the desired oleic acid/oleylamine molar ratio plays a crucial role in controlling size and shape of TiO2 nanocrystals.