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Lin J.,South China Normal University | Zhou Z.,South China Normal University | Wang Q.,South China Normal University | Wang Q.,Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System
Materials Research Bulletin | Year: 2013

GdNbO4:Eu3+ and LuTaO4:Eu3+ have been successfully prepared with different fluxes (NaCl, KCl, NaCl and KCl) by the molten salt method. X-ray diffraction (XRD) patterns illustrated that well crystallized GdNbO4:Eu3+ and LuTaO 4:Eu3+ in the presence of fluxes were formed under reduced temperature (900 C) in contrast to conventional method (GdNbO 4:Eu3+: around 1200 C; LuTaO4:Eu3+: around 1500 C). Scanning electron microscope (SEM) images revealed that well dispersed particles were achieved (granular or rod-like structures). Meanwhile, the photo-luminescent studies demonstrated that both niobate and tantalate are efficient hosts to sensitize europium red emissions. The results indicated that GdNbO4:Eu3+ using NaCl as the flux gave much enhanced red emission whereas LuTaO4:Eu3+ synthesized with the assistance of mixed salts (NaCl-KCl) achieved the best luminescence. © 2013 Elsevier Ltd. All rights reserved. Source


Zhou Z.,South China Normal University | Tan C.,South China Normal University | Zheng Y.,South China Normal University | Wang Q.,South China Normal University | Wang Q.,Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System
Sensors and Actuators, B: Chemical | Year: 2013

A luminescent terbium complex was covalently modified onto anisotropic gold nanostructures (nanoparticles and nanorods) respectively. Two novel emissive gold nanoprobes were successfully developed for selective and rapid determination of vitamin B1 in water. More significantly, electrochemical sensing performances were investigated based on green emissive gold nanoparticles and nanorods which were fabricated by anchoring gold nano-sensors on the surface of glassy carbon electrodes. Both the fluorescence spectra and cyclic voltammetry curves exhibited selective signal changes in the presence of vitamin B1 in comparison with vitamin B2, B3, B4, B5 and B6. It is considered to be the first example that different dimensional fluorescent nano-probes were selected and applied as dual opto-electrochemical sensors for recognizing the same analyte. © 2013 Elsevier B.V. Source


Lin J.,South China Normal University | Wang Q.,South China Normal University | Wang Q.,Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System | Zheng Y.,South China Normal University | Zhang Y.,South China Normal University
CrystEngComm | Year: 2013

The chemical effects of high intensity ultrasound and microwave irradiation on the preparation of europium(iii) activated silver molybdates were investigated and characteristic red emission was successfully achieved at a very low temperature (70°C) in 40 minutes. X-ray powder diffraction results proved that the crystal phase of silver molybdate was heavily related to the pH value. Scanning electron microscopic images revealed rod-like structures of Ag2Mo3O10·1.8H2O and Ag 2Mo2O7 were obtained in the range of pH values between 2 and 5, while growing particles of Ag2MoO4 were formed at pH values of 7 and 8. Furthermore, it has been found that the encapsulation of europium(iii) in monoclinic crystal structure (Ag 2Mo2O7) resulted in enhanced luminescence intensities compared to other crystal phases. © 2013 The Royal Society of Chemistry. Source


Lin J.,South China Normal University | Huo J.,South China Normal University | Cai Y.,South China Normal University | Wang Q.,South China Normal University | Wang Q.,Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System
Journal of Luminescence | Year: 2013

In this paper, phosphors of LuF3:Eu3+/Tb3+ have been successfully synthesized with small chelator ethylenediaminetetra acetic acid (EDTA) or amphiphilic polymer (polyethylene glycol, PEG-1000) as templates via a hydrothermal method. X-ray powder diffraction (XRD), scanning electronic microscope (SEM), and photo-luminescent spectra techniques (PL) were used to characterize the as-prepared samples. XRD patterns showed that well crystallized lanthanide fluorides with hexagonal phase were achieved. SEM images revealed that different regular microstructures were achieved. The photo-luminescent properties of LuF3:Eu3+ demonstrated that there are significant energy transfers from fluorides to Eu3+. The results presented that EDTA as the template will lead to the highest emission intensities. © 2013 Elsevier B.V. Source


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