Wang Tzong-Liu, Wang Yao-Chung, Chang Ying-Hsun, Hsu Hsiang-Yu, Chen Wen-Janq
Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan, Republic of China.
J Nanosci Nanotechnol. 2011 Jan;11(1):167-73. doi: 10.1166/jnn.2011.3101.
In this article, we have developed the synthesis of CdSe nanocrystals by the introduction of high-intensity ultrasound combined with an anionic surfactant (sodium dodecyl sulfate, SDS). TEM, XRD, and SEM EDS confirmed the successful synthesis of CdSe nanoparticles with zinc blende crystal phase. UV, PL, and TEM revealed that large particles settled to the bottom of the reaction flask. In the lower part precipitate, nanorods of different aspect ratios were also observed. The CdSe nanorods were formed by self-assembly due to the SDS surfactant and high-intensity ultrasound. A three-stage mechanism for the synthesis of CdSe nanorods was proposed. The effect of SDS concentration on the shape of nanorods was also investigated. At medium concentrations of SDS (0.2 M), one-dimensional CdSe nanorods with different aspect ratios were obtained. When using low concentrations of SDS (0.1 M), two-dimensional square-like crystals were observed due to all growth crystal faces having roughly the same surface energy.
在本文中，我们通过引入高强度超声并结合阴离子表面活性剂（十二烷基硫酸钠，SDS）开发了CdSe纳米晶体的合成方法。透射电子显微镜（TEM）、X射线衍射（XRD）和扫描电子显微镜能谱分析（SEM EDS）证实成功合成了具有闪锌矿晶相的CdSe纳米颗粒。紫外可见光谱（UV）、光致发光光谱（PL）和透射电子显微镜显示大颗粒沉淀到反应烧瓶底部。在下部沉淀中，还观察到了不同长径比的纳米棒。由于SDS表面活性剂和高强度超声，CdSe纳米棒通过自组装形成。提出了CdSe纳米棒合成的三阶段机制。还研究了SDS浓度对纳米棒形状的影响。在SDS的中等浓度（0.2 M）下，获得了具有不同长径比的一维CdSe纳米棒。当使用低浓度的SDS（0.1 M）时，由于所有生长晶面具有大致相同的表面能，观察到二维方形晶体。
