疏水性纳米银的表面修饰与功能化

Surface Modification and Functionalization of Hydrophobic Silver Nanoparticles

以甲苯为油相、硬脂酸银为银源、硼氢化钠水溶液作还原剂、十二胺作表面活性剂,利用油水界面法制备了疏水性的单分散纳米银颗粒(AgNPs).采用α-环糊精(α-CD)和十六烷基三甲基溴化铵(CTAB)对疏水性纳米银进行表面修饰并实现相转移;利用紫外可见分光光度计(UV-Vis)和透射电子显微镜(TEM)对其转移结果和转移前后纳米颗粒的形态变化进行研究,同时对其转移机理进行了初步探讨.研究表明,α-CD和CTAB可有效修饰和转移疏水性纳米银材料,转移后纳米银紫外特征吸收峰发生红移,颗粒尺寸变大.

Hydrophobic monodispersed silver nanoparticles （AgNPs） were synthesized by an oil-water interface method using silver stearate dissolved in toluene as source of silver ions, sodium borohydride dissolved in water as reducing agent, and dodecylamine as the surfactant. The surface modification and phase transfer of the hydrophobic AgNPs were accomplished with the aid of α-cylodextrin （a-CD） or cetyl trimethyl ammonium bromide （ CTAB ）. Ultraviolet-visible （ UV-Vis ） spectrometry and transmission electron microscopy （TEM） were used for analyzing the effects of surface modification on AgNPs. Moreover, the formation mechanism of the transfer was preliminarily explored. The results showed that a-CD and CTAB transferred the hydrophobic AgNPs into water effectively. The transferred AgNPs were characterized with a larger size in particles and a red-shift absorption in the UV absorbance spectrum.