Formation of zinc oxide nanoparticles of different shapes in water-in-oil microemulsion
Formation of zinc oxide nanoparticles of different shapes in water-in-oil microemulsion
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DOI：
10.1016/j.colsurfa.2011.03.041
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发表时间：
2011-05-20
影响因子：
5.2
通讯作者：
Khilar, Kartic C.
中科院分区：
文献类型：
--
作者：
Sarkar, Deepa;Tikku, Sonia;Khilar, Kartic C.
在本文中，我们报道了通过硝酸锌的碱性水解直接合成不同形状的纯单分散氧化锌纳米粒子，并适当控制Triton X-100/己醇/环己烷的油包水微乳液中的反应物浓度。在每种情况下均获得纯的六方纤锌矿氧化锌纳米颗粒。与弱碱氢氧化铵反应产生2.1-7.7 nm范围内的高度单分散的近球形纳米颗粒，而与强碱氢氧化钠反应在较低反应物浓度下形成纳米棒，在较高反应物浓度下形成较大的矩形纳米颗粒。通过获取光学吸收和发光光谱，在室温下研究了这些氧化锌纳米粒子的光学性质。所有样品在紫外线范围内均表现出强吸收性，并且在可见光范围内几乎透明。通过该技术制备的氧化锌纳米粒子主要是带隙发光，同时在 426-488 nm 处有两个较小的缺陷诱导峰，而氧化锌典型的绿色缺陷诱导发光（500 至 550 nm 之间）被强烈猝灭。 (C) 2011 Elsevier B.V. 保留所有权利。
In this paper we report the direct synthesis of pure monodispersed zinc oxide nanoparticles of different shapes by basic hydrolysis of zinc nitrate with suitable control of the reactant concentrations in the water in oil microemulsion of Triton X-100/hexanol/cyclohexane. Pure hexagonal wurtzite zinc oxide nanoparticles were obtained in each case. Reaction with a weak base ammonium hydroxide yields highly monodispersed nearly spherical nanoparticles in the range 2.1-7.7 nm whereas reaction with strong base sodium hydroxide forms nanorods at lower reactant concentration and larger rectangular nanoparticles at higher reactant concentration. Optical properties of these zinc oxide nanoparticles were studied at room temperature by taking the optical absorption and luminescence spectra. All samples show strong absorption in the UV range and are nearly transparent in the visible range. The band gap luminescence is predominant in the zinc oxide nanoparticles prepared by this technique, along with two smaller defect induced peaks at 426-488 nm,while the green defect induced luminescence (between 500 and 550 nm) typical of zinc oxide is strongly quenched. (C) 2011 Elsevier B.V. All rights reserved.