A novel synthesis of CdSe nanocrystals
A novel synthesis of CdSe nanocrystals
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DOI：
10.1016/j.matlet.2004.02.024
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发表时间：
2004-07-01
影响因子：
3
通讯作者：
Manna, L
中科院分区：
文献类型：
--
作者：
Epifani, M;Giannini, C;Manna, L
提出了一种新型的CdSe纳米晶合成方法，该方法基于快速注入碱引发的硒脲和硝酸镉之间的室温反应。长链硫醇用于终止由反应产生的物质的聚集，获得单分散的颗粒，其在145 ℃下在吡啶中热处理以生长更大的颗粒。TEM观察和光学吸收光谱表明，颗粒尺寸取决于合成参数，而XRD显示形成了六方晶系的CdSe纳米晶。的光学吸收光谱的分析允许提出第一个，简单的模型的形成和生长的纳米晶体。反应机理似乎是通过形成镉硒中间体物种进行的。(C)2004 Elsevier B.V.保留所有权利。
A novel synthesis of CdSe nanocrystals is presented, which is based on the room temperature reaction between selenourea and cadmium nitrate triggered by the fast injection of a base. A long-chain thiol was employed for terminating the aggregation of the species created by the reaction, obtaining monodispersed particles that were heat-treated in pyridine at 145 degreesC to grow larger particles. TEM observations and optical absorption spectra indicate that the particle size depends on the synthesis parameters, while XRD shows the formation of CdSe nanocrystals with hexagonal crystal system. The analysis of the optical absorption spectra allows proposing a first, simple model for the formation and growth of the nanocrystals. The reaction mechanism seems to proceed through the formation of a cadmium-selenourea intermediate species. (C) 2004 Elsevier B.V. All rights reserved.