Enhanced Fluorescence from CdTe Quantum Dots Self-Assembled on the Surface of Silver Nanoparticles

	Enhanced Fluorescence from CdTe Quantum Dots Self-Assembled on the Surface of Silver Nanoparticles
	An L. M.; Yang Y. Q.; Su W. H.; Yi J.; Liu C. X.; Chao K. F.; Zeng Q. H.
	2010
发表期刊	Journal of Nanoscience and Nanotechnology
ISSN	1533-4880
卷号	10 期号:3 页码:2099-2103
摘要	This paper presents an investigation on the fluorescent properties of semiconductor CdTe quantum dots (QDs) self-assembled on the surface of PVP (polyvinylpyrrolidone)-capped silver nanoparticles (NPs) by the ligand field effect. A significant 2.5-fold enhancement in the integrated fluorescence intensities, red shift of fluorescence peak, and obvious decrease of lifetime were observed in the CdTe QDs assembled on the Ag NPs in comparison with the pure CdTe QDs. The fluorescence enhancement factor and red shift were found to depend on the Ag NP concentration. The fluorescence enhancement was attributed to a highly localized electromagnetic field on the Ag NPs generated by the surface plasma and the change in the surface trap state of the CdTe QDs originating from plasma oscillations in the Ag NPs. It is first proposed that the surface passivation of CdTe QDs is also an important factor for metal-enhanced fluorescence. The surface defects of CdTe QDs can be modified by the Cd-O coordination interaction between the CdTe QDs and PVP molecules, which will cause the trap state density and luminescence lifetime to decrease. The surface passivation of CdTe QDs can also improve fluorescence quantum yield and lead to the red shift of the fluorescence peak. Compared with previous reports, the occurrence of the self-assembly of CdTe QDs on the surface of PVP-capped Ag NPs is fairly simple and easy. From a practical point of view, the combination of CdTe QDs with Ag NPs may lead to the fluorescence enhancement, which could be utilized in a variety of chemical and biological detection applications.
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/34485
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	An L. M.,Yang Y. Q.,Su W. H.,et al. Enhanced Fluorescence from CdTe Quantum Dots Self-Assembled on the Surface of Silver Nanoparticles[J]. Journal of Nanoscience and Nanotechnology,2010,10(3):2099-2103.
APA	An L. M..,Yang Y. Q..,Su W. H..,Yi J..,Liu C. X..,...&Zeng Q. H..(2010).Enhanced Fluorescence from CdTe Quantum Dots Self-Assembled on the Surface of Silver Nanoparticles.Journal of Nanoscience and Nanotechnology,10(3),2099-2103.
MLA	An L. M.,et al."Enhanced Fluorescence from CdTe Quantum Dots Self-Assembled on the Surface of Silver Nanoparticles".Journal of Nanoscience and Nanotechnology 10.3(2010):2099-2103.