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Morphological control in solvothermal synthesis of titanium oxide

机译：溶剂热合成氧化钛的形貌控制

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摘要

A solvothermal method is described for preparing nanomaterials of titanium oxide with different morphologies. Nanostructures, such as wire, rod, cube, and fiber, were synthesized in mass quantities by controlling either the concentrations of the precursor or growth temperature and introducing different additives in one simple system based on titanium tetroisopropoxide and ethylene glycol. Hydrothermal treatment of the base system produced nanowires with diameters around 40 nm. The addition of ethylenediamine (EDA) to the system inhibited the radial expansion of the nanowires, resulting in nanorods and nanofibers with diameters down to about 2 nm. Increasing the EDA concentration tended to induce mesoscale self-assembly of nanofibers into arrays. The presence of water promoted the formation of nearly spherical nanoparticles with sizes dependent on the EDA concentration. At higher temperatures, the same system yielded well-defined nanobelts or nanocubes. The replacement of EDA by 2,4-pentanedione favored the formation of nanosheets while tetramethylammonium hydroxide appeared to confuse the growth of nanorods, creating a continuous network.
机译：描述了一种溶剂热法制备具有不同形态的氧化钛纳米材料。通过控制前驱物的浓度或生长温度，并在基于四异丙氧基钛和乙二醇的简单系统中引入不同的添加剂，可以大量合成纳米结构，例如线，杆，立方体和纤维。基本系统的水热处理产生了直径约为40 nm的纳米线。向系统中添加乙二胺（EDA）会抑制纳米线的径向膨胀，从而导致直径小于2 nm的纳米棒和纳米纤维。 EDA浓度的增加往往会引起纳米纤维的中尺度自组装成阵列。水的存在促进了尺寸取决于EDA浓度的近球形纳米颗粒的形成。在更高的温度下，同一系统产生了定义明确的纳米带或纳米立方体。用2，4-戊二酮代替EDA有利于纳米片的形成，而氢氧化四甲基铵似乎使纳米棒的生长变得混乱，从而形成了连续的网络。

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  • 来源
    《Journal of Materials Science》 |2007年第16期|6583-6589|共7页
  • 作者

    Rong-Cai Xie; Jian Ku Shang;

  • 作者单位

    Institute of Metal Research Shenyang National Laboratory for Materials Science Shenyang 110016 China;

    Department of Material Science and Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 USA;

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