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首页> 外文期刊>Crystal growth & design >Surface Activity of Highly Hydrophobic Surfactants and Platelike PbSe and CuSe Nanoparticles
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Surface Activity of Highly Hydrophobic Surfactants and Platelike PbSe and CuSe Nanoparticles

机译：高疏水性表面活性剂以及板状PbSe和CuSe纳米粒子的表面活性

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Lead selenide (PbSe) and copper selenide (CuSe) nanoparticles were synthesized in aqueous phase at a relatively mild temperature (85 degrees C) in the presence of various cationic Gemini surfactants (12-2-12, 12-0-12, and 16-2-16) as capping/stabilizing agents. All nanoparticles exhibited clear core shell (surfactant) morphologies. PbSe reactions produced predominantly platelike cubic morphologies along with long Se nanorods (NRs) as a reaction byproduct. CuSe particles were polyhedral thin plates with perforations. High resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), and X-ray diffraction (X R D) measurements were used to characterize the shape and structure of the particles. HRTEM allowed us to measure the precise thickness of the surfactant shell around each nanocrystal (NC) which was in excellent agreement with the length of the surfactant hydrocarbon tail. Infrared spectroscopic (FT-IR) studies suggested a strong affinity of cationic surfactant for NC surface which was the driving force for the monolayer formation in the form of a shell. Energy dispersive X-ray spectroscopic (EDS) analysis demonstrated that PbSe and CuSe particles were always in 1:1 stoichiometry, and Se NRs were made up of only pure Se and no Pb contents were observed. Stronger interfacial adsorption of a surfactant with greater hydrophobicity controlled the morphology to produce platelike geometries. The size of PbSe and CuSe particles increased while the thickness decreased as the hydrophobicity of the surfactant increased in the order of 12-2-12 < 12-0-12 < 16-2-16.
机译：在各种阳离子双子表面活性剂（12-2-12、12-0-12和16）的存在下，在相对温和的温度（85摄氏度）下，在水相中合成硒化铅（PbSe）和硒化铜（CuSe）纳米颗粒-2-16）作为封盖剂/稳定剂。所有纳米颗粒均显示出清晰的核壳（表面活性剂）形态。 PbSe反应主要产生板状立方形态，同时长的Se纳米棒（NRs）作为反应副产物。 CuSe颗粒是具有穿孔的多面体薄板。高分辨率透射电子显微镜（HRTEM），场发射扫描电子显微镜（FESEM）和X射线衍射（X R D）测量用于表征颗粒的形状和结构。 HRTEM允许我们测量每个纳米晶体（NC）周围的表面活性剂壳的精确厚度，这与表面活性剂烃尾的长度非常吻合。红外光谱（FT-IR）研究表明阳离子表面活性剂对NC表面具有很强的亲和力，这是壳层形式单分子层形成的驱动力。能量色散X射线光谱（EDS）分析表明，PbSe和CuSe颗粒始终为1：1化学计量，Se NRs仅由纯Se组成，未观察到Pb含量。具有更大疏水性的表面活性剂的更强界面吸附控制了形态以产生板状几何形状。随着表面活性剂疏水性的增加，PbSe和CuSe颗粒的尺寸增加，而厚度减小，顺序为12-2-12 <12-0-12 <16-2-16。

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