Journal of Jishou University(Natural Sciences Edition) ›› 2013, Vol. 34 ›› Issue (6): 56-60.DOI: 10.3969/j.issn.1007-2985.2013.06.015

• Chemistry and chemical engineering • Previous Articles     Next Articles

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

 WANG  Yi-Lin, YANG  Kun, LIU  Sheng-Yan, MO  Li-Shu, LI  Huai-Mei   

  1. (School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)
  • Online:2013-11-25 Published:2014-01-02

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

WeChat e-book chaoxing Mobile QQ