紫外光照射制备具有光学活性的银纳米粒子  

Preparation of Optically Active Ag Nanoparticles by UV Light Irradiation

作　　者：王静[1] 易特[1] 罗秦[1] 刘亚君[1] 

机构地区：[1]江苏科技大学环境与化学工程学院,镇江212003

出　　处：《无机化学学报》2014年第8期1889-1894,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21203079)资助项目

摘　　要：以脱氧胆酸钠(NaDC)为还原剂、稳定剂,经紫外光辐照AgNO3溶液在室温下制备出尺寸30 nm左右的类球形的银纳米粒子。用紫外-可见光谱、透射电镜、圆二色谱和傅立叶变换红外光谱等测试手段对所制备的脱氧胆酸钠包裹的银纳米粒子进行了表征。红外光谱结果表明,在紫外光激发下,脱氧胆酸钠甾环上12α-OH发生氧化反应,同时还原Ag+为单质银,并聚集生成银纳米粒子。溶液的pH值对光化学氧化还原反应速度有着重要的影响,增加溶液的pH值,Ag+的还原反应速度明显加快。在吸附在银粒子表面的脱氧胆酸钠的手性氛围诱导下,生成的银纳米粒子在其表面等离子体共振区域出现手性信号。Spherical Ag nanoparticles with a diameter about 30 nm were prepared by the reduction of AgNO3 under ultraviolet irradiation in the presence of sodium deoxycholate （NaDC） as a reducing agent and stabilizer at room temperature. The prepared NaDC-coated Ag nanoparticles were characterized by UV-Vis, TEM, FTIR and Circular Diehroism Spectrometer （CD）. The results of IR spectra show that 12a-hydroxyl groups of steroid ring of NaDC are oxidized and simultaneously silver ions are reduced to elemental silvers which aggregate into silver nanoparticles. The pH value of the solution has an important influence on the rate of photochemical oxidationreduction reaction. Increasing the pH value of the solution can accelerate the reduction rate of silver ion remarkably. The prepared Ag nanoparticles show chiral signal induced by the chiral environment of NaDC adsorbed on the surface of the particles in the region of surface plasmon resonance.

关 键 词：纳米粒子 光化学还原 手性 表面等离子体共振 

分 类 号：O614[理学—无机化学]