Citation: Xiu Ling Wang, Lu Wei, Guan Hong Tao, Meng Qiong Huang. Synthesis and characterization of magnetic and luminescent Fe₃O₄/CdTe nanocomposites using aspartic acid as linker[J]. Chinese Chemical Letters, ;2011, 22(2): 233-236. doi: 10.1016/j.cclet.2010.09.016 shu

Synthesis and characterization of magnetic and luminescent Fe₃O₄/CdTe nanocomposites using aspartic acid as linker

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

Received Date: 3 June 2010

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 20345006 and 20575043).

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 the Fe₃O₄/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.
- Fe₃O₄/CdTe nanocomposites,
- Luminescent,
- Magnetic,
- Synthesis,
- Aspartic acid
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