Fluorescence enhancement and quenching of Eu3+ ions by Au–ZnO core-shell and Au nanoparticles

Haldar, Krishna Kanta; Patra, Amitava
August 2009
Applied Physics Letters;8/10/2009, Vol. 95 Issue 6, p063103
Academic Journal
We investigate the enhancement and quenching of Eu3+ emission in presence of Au–ZnO core-shell nanoparticles and Au nanoparticles. The quenching of Eu3+-emission in presence of Au nanoparticles is caused by change of nonradiative rate due to energy transfer. However, the enhancement of Eu3+-emission in presence of Au–ZnO core-shell nanoparticles is due to local field, which modifies the radiative and nonradiative rate. Enhancement and quenching of Eu3+ emission reflect the change in environment of Eu3+ from Au nanoparticles to Au–ZnO core-shell nanoparticles which is confirmed by the Judd–Ofelt parameter (Ω2) analysis.


Related Articles

  • The effect of nanocrystal surface structure on the luminescence properties: Photoemission study of HF-etched InP nanocrystals. Adam, S.; Talapin, D. V.; Borchert, H.; Lobo, A.; McGinley, C.; de Castro, A. R. B.; Haase, M.; Weller, H.; Möller, T. // Journal of Chemical Physics;8/22/2005, Vol. 123 Issue 8, p084706 

    InP nanocrystals with narrow size distribution and mean particle diameter tunable from ∼2 up to ∼7 nm were synthesized via the dehalosilylation reaction between InCl3 and tris(trimethylsilyl)phosphine. Specific capping of the nanocrystal surface with a shell of organic ligands protects...

  • Phase diagrams in compressible weakly interacting all-polymer nanocomposites. Ruiz de Luzuriaga, Alaitz; Grande, Hans J.; Pomposo, José A. // Journal of Chemical Physics;2/28/2009, Vol. 130 Issue 8, pN.PAG 

    A compressible regular solution free energy model for describing the phase behavior of weakly interacting binary blends comprising nonrigid polymer nanoparticles and linear-polymer chains (i.e., all-polymer nanocomposites) has been developed by incorporating specific nanoparticle-nanoparticle...

  • What is a Suitable Dissolution Method for Drug Nanoparticles? David Cutler; Hak-Kim Chan; Jimmy Yun; Judy Raper // Pharmaceutical Research;Jul2008, Vol. 25 Issue 7, p1696 

    Abstract Purpose  Many existing and new drugs fail to be fully utilized because of their limited bioavailability due to poor solubility in aqueous media. Given the emerging importance of using nanoparticles as a promising way to enhance the dissolution rate of these drugs, a method must be...

  • Synthesis of Polymer Grafted Magnetite Nanoparticle with the Highest Grafting Density via Controlled Radical Polymerization. Babu, Kothandapani; Dhamodharan, Raghavachari // Nanoscale Research Letters;Sep2009, Vol. 4 Issue 9, p1090 

    The surface-initiated ATRP of benzyl methacrylate, methyl methacrylate, and styrene from magnetite nanoparticle is investigated, without the use of sacrificial (free) initiator in solution. It is observed that the grafting density obtained is related to the polymerization kinetics, being higher...

  • Atomic-Scale Structure of Al2O3-ZrO2 Mixed Oxides Prepared by Laser Ablation. Yang, Xiuchun; Dubiel, M.; Hofmeister, H.; Riehemann, W. // AIP Conference Proceedings;2007, Vol. 882 Issue 1, p563 

    By means of x-ray diffractometry (XRD) and X-ray absorption fine structure spectroscopy, the phase composition and atomic structure of laser evaporated ZrO2 and ZrO2-Al2O3 nanopowders have been studied. The results indicate that pure ZrO2 exists in the form of tetragonal structure, Al2O3 doped...

  • Formation and Characterization of Beclomethasone Dipropionate Nanoparticles Using Rapid Expansion of Supercritical Solution. Hosseinpour, Mohsen; Vatanara, Alireza; Zarghami, Reza // Advanced Pharmaceutical Bulletin;9/15/2015, Vol. 5 Issue 3, p343 

    Purpose: Particle size of Beclometasone Dipropionate (BDP) was reduced by the rapid expansion of supercritical solution (RESS) process, using CO2 as supercritical solvent. Also, the effect of RESS parameters such as extraction pressure, pre-expansion temperature, and weight fraction of...

  • Formation of Star-Like and Core-Shell AuAg Nanoparticles during Two- and Three-Step Preparation in Batch and in Microfluidic Systems. Köhler, J. Michael; Romanus, H.; Hübner, U.; Wagner, J. // Journal of Nanomaterials;2007 Regular Issue, p1 

    Regular dendrit-like metal nanoparticles and core-shell nanoparticles were formed by the reduction of mixtures of tetrachloroaurate and silver nitrate solutions with ascorbic acid at room temperature in two- and three-step procedures. The formation of these particles was found in batch...

  • Nanoparticles in nematic liquid crystals: Interactions with nanochannels. Hung, Francisco R.; Gettelfinger, Brian T.; Koenig Jr., Gary M.; Abbott, Nicholas L.; de Pablo, Juan J. // Journal of Chemical Physics;9/28/2007, Vol. 127 Issue 12, p124702 

    A mesoscale theory for the tensor order parameter Q is used to investigate the structures that arise when spherical nanoparticles are suspended in confined nematic liquid crystals (NLCs). The NLC is “sandwiched” between a wall and a small channel. The potential of mean force is...

  • Monolayer protection for eletrochemical migration control in silver nanocomposite. Li, Yi; Wong, C. P. // Applied Physics Letters;9/11/2006, Vol. 89 Issue 11, p112112 

    The authors introduced an effective approach of using monolayer-protected silver nanoparticles to reduce silver migration for electronic device interconnect applications. Formation of surface complex between the carboxylate anion and surface silver ion reduces the solubility and diffusivity...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics