It has been observed that the fluorescence intensity of DMDBMAD decrease with increase in the size of the Ag NPs. The quenching rate constant and association constant were determined using Stern-Volmer and Benesi-Hildebrand plots. The Stern-Volmer plot suggested that the quenching of DMDBMAD fluorescence by silver NPs was a dynamic process. The obtained value of the association constant infers that
通过Creighton方法合成了9至17 nm不同大小的
银纳米颗粒(Ag NPs),并使用紫外可见光谱和高分辨率透射电子显微镜(HR
TEM)对其进行了表征。结合紫外可见吸收光谱技术研究了
甲醇中1,4-二甲氧基-2,3-二
溴甲基蒽-9,10-二酮(
DMD
BMAD)的荧光猝灭。已经观察到
DMD
BMAD的荧光强度随着Ag NP的尺寸的增加而降低。淬灭速率常数和缔合常数使用Stern-Volmer和Benesi-Hildebrand图确定。Stern-Volmer图表明
银NP对
DMD
BMAD荧光的猝灭是一个动态过程。所获得的缔合常数的值推断出
DMD
BMAD与Ag NP之间存在缔合。利用傅斯特共振能量转移(FRET)理论,得到了供体(
DMD
BMAD)与受体(Ag NPs)之间的距离以及临界能量转移距离。激发供体和基态受体分子之间的长距离偶极-偶极相互作用是负责能量转移的主要机理。