KCl对Ri_n-NPsAg体系中Ri分子光谱行为的影响  

Effects of KCl on Spectral Behaviors of Riboflavin in the Ri_n-NPsAg Composite System

作　　者：张怀斌[1] 张娟[2] 刘文波[1] 李怀祥[3] 

机构地区：[1]滨州医学院烟台校区药学院,烟台264003 [2]鲁东大学农学院,烟台264003 [3]山东师范大学化学化工与材料科学学院,济南250014

出　　处：《硅酸盐通报》2013年第6期1077-1081,1102,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金资助项目(60671010);山东省高等学校科技计划资助项目(J12LD55);滨州医学院科研专项资助项目(BY2009KJ30);滨州医学院大学生科技创新项目(BY2011DKCX13)

摘　　要：核黄素(Riboflavin,Ri)与纳米银(Nanosilver particals,NPsAg)均匀混合形成(Ri)n-纳米银复合体系(Rin-NPsAg体系)。运用透射电镜、紫外可见吸收光谱、荧光光谱研究了电解质KCl对Rin-NPsAg体系中Ri分子光谱行为的影响。Ri与纳米银混合后,Ri分子的吸收增强、峰位移动,发生荧光猝灭;加入KCl后,Ri分子吸收峰位逐渐移向原位,吸收强度整体减弱,荧光增强,直至达到定值。这是因为:KCl能够使纳米银团聚与聚沉,粒径增大,浓度减小,改变了纳米银显微结构与Ri分子的作用关系;KCl对Rin-NPsAg体系中Ri分子光谱的影响主要是通过改变纳米银的结构、粒径、浓度及纳米银与Ri分子的距离实现的。The composite system of riboflavin and silver nanoparticles（Rin-NPsAg） was obtained via uniformly mixing the riboflavin and nanosilver.The effects of KCl on spectral behaviors of riboflavin in the Rin-NPsAg composite system were investigated by transmission electron microscope（TEM）,Uv-vis absorption spectrum（Uv-vis）,fluorescence spectrum,respectively.The absorption intensity of riboflavin enhanced and the absorption peak of riboflavin shifted and the fluorescence intensity was quenched when nanosilver was added.In the presence of KCl,the absorption peak position of riboflavin went back to basic position,and the absorption intensity of riboflavin increased,but it was still stronger than that of pure riboflavin.And the fluorescence intensity continued to increase until it reached to a constant value.It is because KCl leads to the aggregation and coagulation of silver nanoparticals that results in partical diameter enlargement and concentration diminishment.And then the interaction between nanosilver microstructure and riboflavin also changes.The effects of KCl on spectral behaviors of riboflavin in the Rin-NPsAg composite system come ture through changing the surface structure,particle diameter and the concentration of the silver nanoparticles and the distance between nanosilver and riboflavin moleculars.

关 键 词：纳米银 核黄素 氯化钾 荧光增强 光谱行为 

分 类 号：O482[理学—固体物理]