Synthesis of submicrometer-sized titania spherical particles with a sol-gel method and their application to colloidal photonic crystals
Synthesis of submicrometer-sized titania spherical particles with a sol-gel method and their application to colloidal photonic crystals
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DOI：
10.1016/j.jcis.2005.04.077
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发表时间：
2005-11-01
影响因子：
9.9
通讯作者：
Konno, M
中科院分区：
文献类型：
--
作者：
Mine, E;Hirose, M;Konno, M
提出了一种制备亚微米级二氧化钛颗粒的合成方法，该方法基于使用助溶剂和胺催化剂进行醇盐水解的钛醇盐水解。在乙醇/乙腈、乙醇/甲醇、乙醇/丙酮、乙醇/乙腈和乙醇/甲酰胺的不同溶剂中，对于0.1- 0.3M水和0.03M四异丙醇钛（TTIP），在10-50 ℃的温度下，用氨、甲胺（MA）和二甲胺（DMA）的不同胺进行制备。需要使用乙醇/乙腈溶剂与MA来制备单分散的球形颗粒。二氧化钛粒子的数均粒径和它们的变异系数分别从143至551 nm和从5.7至20.6%，与反应温度和水和MA的浓度变化。胶体晶体的二氧化钛粒子的沉淀法制造的反射峰归因于布拉格衍射。在100-1000 ℃下退火导致二氧化钛颗粒的收缩和结晶，随后二氧化钛颗粒的折射率增加。(c)2005年爱思唯尔公司All rights reserved.
A synthetic method for preparing submicrometer-sized titania particles is proposed, which is based on hydrolysis of titanium alkoxide with the use of a cosolvent and an amine catalyst for alkoxide hydrolysis. The preparation was performed with different amines of ammonia, methylamine (MA), and dimethylamine (DMA) in different solvents of ethanol/acetonitrile, ethanol/methanol, ethanol/acetone, ethanol/acetonitrile, and ethanol/formamide for 0.1-0.3 M water and 0.03 M titanium tetraisopropoxide (TTIP) at temperatures of 10-50 degrees C. The use of the ethanol/acetonitrile solvent with MA was required for preparing monodispersed, spherical particles. The number average of the titania particle sizes and their coefficient of variation were varied from 143 to 551 nm and from 5.7 to 20.6%, respectively, with reaction temperature and concentrations of water and MA. Colloidal crystals of titania particles fabricated with a sedimentation method revealed reflection peaks attributed to Bragg's diffraction. Annealing at 100-1000 degrees C led to shrinkage and crystallization of titania particles followed by an increase in the refractive index of titania particles. (c) 2005 Elsevier Inc. All rights reserved.