自组装Ag纳米颗粒的表面等离子体共振及其对CdSe量子点的荧光增强效应

摘要

Ag colloids solution was synthesized by reduction of AgNO3 from sodium citrate. Monodisperse Ag nanoparticles films were self-assembled by electrostatic deposition technique. We investigated the optical properties of Ag nanoparticles. The size of Ag nanoparticles and its surface plasmon resonance absorption properties were controlled by changing the concentration of the reactants and the following annealing temperature. Ag nanoparticles mediated emission of CdSe quantum dots (QDs) was also studied. By coupling Ag nanoparticles film to CdSe QDs, a significant enhancement in photoluminescence (PL) intensity of CdSe QDs was observed,which was due to the enhancement effect of surface plasmon resonance from metal nanoparticles.%采用柠檬酸三钠还原硝酸银的方法制备了Ag纳米粒子溶胶,利用静电自组装技术制得单分散Ag纳米颗粒薄膜.研究了该Ag纳米颗粒薄膜的光学特性,通过改变反应物浓度和后期的热退火温度,有效调控了Ag纳米颗粒尺度和其在外场作用下产生的表面等离子体共振(SPR)特性.将所制备的Ag纳米颗粒薄膜与CdSe量子点耦合,利用SPR对荧光的增强效应,使CdSe量子点的光致发光强度增强达11倍.