Synthesis and characterization of magnetic and luminescent Fe_3O_4/CdTe nanocomposites using aspartic acid as linker |
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Authors: | Xiu Ling Wang Lu Weic Guan Hong Tao Meng Qiong Huangb a School of Chemistry Chemical Engineering Materials Science Suzhou University Suzhou China b School of Chemical Biological Engineering Suzhou University of Science Technology Suzhou China c Yantai Entry-exit Inspection Quarantine Bureau Yantai China |
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Institution: | a School of Chemistry, Chemical Engineering and Materials Science, Suzhou University, Suzhou 215123, China;b School of Chemical and Biological Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;c Yantai Entry-exit Inspection and Quarantine Bureau, Yantai 264000, China |
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Abstract: | In this study, the preparation of a new kind of magnetic and luminescent Fe3O4/CdTe nanocomposites was demonstrated. Superparamagnetic Fe3O4 nanoparticles were first synthesized by hydrothermal coprecipitation of ferric and ferrous ions, followed by the modification of their surfaces with tetramethylammonium hydroxide (TMAOH) and the chemical activation with aspartic acid. The surface-modified Fe3O4 nanoparticles were then covalently coated with CdTe quantum dots (QDs), which were modified with mercaptoacetic acid (MPA), to form theFe3O4/CdTe magnetic and luminescent nanocomposites through the coordination of the amino groups on the surfaces of Fe3O4 and the carboxyl groups on CdTe QDs. The structure and properties of as-synthesized nanocomposites were characterized. It was indicated that the nanocomposites possessed structure with an average diameter of 40-50 nm, yellow-green emission feature and room temperature ferro-magnetism. Both the fluorescence and UV-vis absorption spectra of the nanocomposites showed a blue shift comparing with those of CdTe QDs. The mechanism of the blue shift was presented. The nanocomposites retained the ferromagnetic property with a saturation magnetization of 8.9 emu/g. |
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Keywords: | " target="_blank">3O4/CdTe nanocompositeszz')" href="#"> Fe3O4/CdTe nanocomposites Luminescent Magnetic Synthesis Aspartic acid |
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