【作者】 王青如； 宋峰； 张超； 赵红艳； 刘加东； 明成国； 林赏心； 潘裕斌；

【Author】 Qingru Wang 1,Feng Song,1,Chao Zhang 1,Hongyan Zhao 1,Jiadong Liu 1,Chengguo Ming 1,Shangxin Lin 2,Edwin.Y.B.Pun 2.(1Photonics Center,College of Physics Science,Nankai University,Tianjin 300071,China) (2 Department of Electronic Engineering,City University of Hong Kong,Hong Kong,999077)

【机构】 南开大学物理学院光子学中心； 香港城市大学电子工程学院；

【摘要】 采用化学方法分别制备了球形银纳米颗粒、三角形银纳米薄片和三角形金纳米薄片三种金属纳米颗粒,然后将这三种金属纳米颗粒分别置于Eu(TTFA)3掺杂的Su8薄膜上。通过利用扫描探测显微镜,紫外-可见-近红外19分光光度计和荧光光谱仪等测试手段对金属纳米颗粒的形状、大小及它们对薄膜发光的影响进行了研究。相比于未放置颗粒时薄膜的发光,放置有两种银颗粒的样品的发光有明显的增强,球形银颗粒的样品的发光增强效果更为明显。而三角形片状金颗粒对样品的发光却起到了淬灭作用。实验结果显示,金属纳米颗粒既可以增强薄膜材料的发光也可以淬灭薄膜材料的发光,这主要取决于金属纳米颗粒的局域等离子体共振。如果共振谱与激发或辐射谱重合,则会使薄膜材料产生极大的发光增强,如果不重合,就有可能会淬灭薄膜材料的发光。更多还原

【Abstract】 The spherical silver (Ag) nanoparticles,triangular Ag nanoprisms and triangular gold (Au) nanoprisms were synthesized by chemical method,separately.Then they were deposited on the Eu(TTFA) 3 doped Su8 films.The size,shape of nanoparticles and their influence on the fluorescence of films were measured by scanning electron microscopy,Perkin Elmer UV-visible-NIR Lambda 19 Spectrophotometer,and Jobin Yvon Fluorolog-3 Spectrophotometer System separately.Compared with the fluorescence of films without nanoparticles,the fluorescence was greatly enhanced by the two kinds of the Ag nanoparticles,the enhancement is greater for the spherical Ag nanoparticles than that for the triangular Ag nanoprisms.The fluorescence was quenched for the film with Au nanoprisms.The results show that the nanoparticles can both enhance and quench the fluorescence of the films,which depend mainly on the local surface plasmon resonance (LSPR) of nanoparticles.When the LSPR of nanoparticles overlaps with the excitation or the emssion spectrum of the films,the fluorescence would be enhanced.Otherwise the fluorescence of the films would be quenched.更多还原