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The Study of Eu(Ⅲ),Tb(Ⅲ)-phenanthroline@Graphene Photoelectric Functional Materials

Author: SunYu
Tutor: MoZunLi
School: Northwest Normal University
Course: Inorganic Chemistry
Keywords: Nano materials Photoelectric conversion Graphene Rare earth complexes
CLC: O613.71
Type: Master's thesis
Year: 2013
Downloads: 17
Quote: 0
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Abstract

Graphene because of its unique two-dimensional honeycomb lattice nano structure and excellent electrical, mechanical, optical, magnetic, energy storage properties, since its huge potential application by chemists, biologists, physicists and materials scientists attention. Graphene unique microstructure and fluorescence quenching effect, become the carrier of electronic and energy transfer. Rare earth organic compound in the uv region often have greater absorption, through effective molecules can spread process will be excited state of energy transfer to the rare earth ions emission level, greatly improve the characteristics of rare earth ion emission. Our results show that:graphene and graphite oxidation of rare earth complexes with organic fluorescence quenching effect, compared with graphene fluorescence quenching effect is stronger. In order to explain graphene fluorescence quenching mechanism, we prepared different rare earth ions organic compound@graphene photoelectric composite material, found that rare earth ion organic compound of light finally into composite material of energy, its during an electronic transfer and conversion of energy.This study is divided into three parts:Firstly, use Hummers for preparation of graphite oxide, sodium borohydride as reducing agent, the oxidation graphite thermal reduction for graphene. Use room temperature mixing methods will graphene and Eu(Ⅲ)-1,10-phenanthroline complexes for composite, the use of scanning electron microscope (SEM) and transmission electron microscopy (TEM) on the composite surface morphology and structure were analyzed, and the results show that Eu(Ⅲ)-1,10-phenanthroline complexes evenly coated on the surface of graphene. Fluorescence spectrum shows that graphene to Eu(Ⅲ)-1,10-phenanthroline complexes have strong fluorescence quenching effect, and when the Eu(Ⅲ) ion quality accounted for7%of graphene quality to normal distribution vertices. In the lighting and lighting conditions circulation volt-ampere curve and i-t curve showed that compound and graphene happened between the photoelectric conversion.Secondly, with the proposed method was successfully out Tb(Ⅲ)-1,10-phenanthroline@graphene photoelectric composite material, the use of scanning electron microscope (SEM) and transmission electron microscopy (TEM) on the composite surface morphology and structure were analyzed, and the results show that Tb(III)-1,10-phenanthroline complexes evenly coated on the surface of graphene. Fluorescence spectrum shows that graphene in Tb(III)-1,10-phenanthroline complexes fluorescence also has strong quenching effect, and when Tb(III) ion quality accounted for5%of graphene quality to normal distribution vertices. In the lighting and lighting conditions circulation volt-ampere curve and i-t curve showed that compound and graphene happened between the photoelectric conversion. And Eu(III)-1,10-phenanthroline@graphene photoelectric composite material than the photoelectric conversion efficiency is low, its thermal stability is a bit poor.Thirdly, use the method of stirring at room temperature respectively graphene and Eu(III),Tb(III)-phenyl anthranilic acid compound, Eu(III),Tb(III)-8-hydroxy quinoline compound for composite, fluorescence spectrum shows that graphene to Eu(III),Tb(III) ion complexes fluorescence quenching effect as ligands with graphene formation conjugate system group to reduce and abate, so that Eu(III)-1,10-phenanthroline@graphene photoelectric composite material and Tb(III)-1,10-phenanthroline@graphene photoelectric composite materials complexes and graphene formed the conjugate big π bond, in particular wavelength of ultraviolet irradiation excitation produced under the electron transfer and energy transformation.

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