用硫脲分子表面修饰的CdS纳米粒子的合成和表征

SYNTHESIS AND CHARACTERIZATION OF THE CdS NANOPARTICLES SURFACE CAPPED WITH THIOUREA

报道了用硫脲分子进行表面化学修饰的 Ｃｄ Ｓ 纳米粒子的合成方法，并引入了 Ａ Ｏ Ｔ（ 磺基琥珀酸双２乙基己基酯钠盐） 作为平衡反离子，进一步对 Ｃｄ Ｓ 表面作了修饰，增加了 Ｃｄ Ｓ 纳米粒子在有机溶剂中的稳定性和可分散性。我们还探讨了温度、浓度、ｐ Ｈ 等因素对合成的影响，并通过 Ｔ Ｅ Ｍ、 Ｘ Ｒ Ｄ、 Ｆ Ｔ Ｉ Ｒ 等手段对产物结构进行了表征。所得微粒粒径为５ ｎｍ 左右，呈球形，硫脲分子与 Ｃｄ Ｓ纳米粒子富 Ｃｄ２ ＋ 表面通过形成 Ｃｄ Ｓ 配位键而修饰在粒子表面。这种表面修饰的 Ｃｄ Ｓ 纳米粒子将在非线性光学及自组装方面具有优异的性能。

his paper report synthetic method of the CdS nanoparticles surface capped with thiourea. Moreover we introduct AOT SO\-3\+-((bis 2 ethylhexyl)sulfosuccinate))into surface modified CdS nanoparticles as counter ion, which increase stability and dispersion of CdS nanoparticles in organic solvents. We also study the factors affecting synthesis such as temperature, concentration, pH and so on. The structure of product is characterized by means of TEM, XRD, FT IR etc. The results demonstrate that CdS nanoparticles is spherical particle, its diameter is about 5 nm and it is stable and can disperse well in CHCl\-3, Pyridine. In such nanoparticles, electroneutral ligand of thiourea modify the Cd\+\{2+\} rich surface of CdS nanoparticles through Cd S coordination bonding, counter ion of AOT SO\-3\+- exist as the balance charge. This surface modified CdS nanoparticles have excellent properties in the nonlinear optics and the self assemble.\;\;