Synthesis and Fluorescence Spectra Analysis of 3-Mercaptopropionic Acid Stabilized CdSe Quantum Dots

doi:10.3969/j.issn.1007-2985.2013.06.015

Abstract

Abstract: Cadmium selenide quantum dots (QDs) were prepared by the reaction of CdCl₂·2.5H₂O,Na₂SeO₃ and NaBH4 in water and in the presence of 3-mercaptopropionic acid (MPA) as stabilizer.The influences of experimental conditions,including refluxing time,cadmium to selenium molar ratio and cadmium to MPA molar ratio,on the luminescent properties of the obtained CdSe QDs were systematically investigated.Furthermore,the obtained QDs were characterized by UV-vis absorption spectra,photoluminescence (PL) spectra,X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM).Experimental results indicated that the refluxing time and the relative quantities of reactants impacted the optical properties of QDs.The proposed method enabled us to obtain cubic CdSe QDs with narrow fluorescence full width at half maximum (35~40 nm).It was found that 16.1 % of photoluminescence quantum yield was achieved when reaction system was refluxed for 90 min at pH 11.0,and nCd∶nSe∶nMPA= 1∶0.2∶1.1.

Key words: quantum dots, chemical synthesis, optical properties, luminescence

WANG Yi-Lin, YANG Kun, LIU Sheng-Yan, MO Li-Shu, LI Huai-Mei. Synthesis and Fluorescence Spectra Analysis of 3-Mercaptopropionic Acid Stabilized CdSe Quantum Dots[J]. Journal of Jishou University(Natural Sciences Edition), 2013, 34(6): 56-60.

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