Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol)

Materials Research

Fábio Pereira Ramanery¹  Alexandra Ancelmo Piscitelli Mansur¹  Herman Sander Mansur¹ 

[1] ,Federal University of Minas Gerais Department of Metallurgical and Materials Engineering Center of Nanoscience, Nanotechnology and InnovationBelo Horizonte MG ,Brazil

关键词: nanomaterial;    colloid;    nanotechnology;    semiconductor;    polymer;   

DOI  :  10.1590/S1516-14392014005000060

来源: SciELO

【 摘 要 】

The main goal of this work was to synthesize CdSe/CdS (core-shell) nanoparticles stabilized by polymer ligand using entirely aqueous colloidal chemistry at room temperature. First, the CdSe core was prepared using precursors and acid-functionalized poly(vinyl alcohol) as the capping ligand. Next, a CdS shell was grown onto the CdSe core via the layer-by-layer technique. The CdS shell was formed by two consecutive monolayers, as estimated by empirical mathematical functions. The nucleation and growth of CdSe quantum dots followed by CdS shell deposition were characterized by UV-vis spectroscopy, photoluminescent (PL) spectroscopy and transmission electron microscopy (TEM). The results indicated a systematic red-shift of the absorption and emission spectra after the deposition of CdS, indicating the shell growth onto the CdSe core. TEM coupled with electron diffraction analysis revealed the presence of CdSe/CdS with an epitaxial shell growth. Therefore, it may be concluded that CdSe/CdS quantum dots with core-shell nanostructure were effectively synthesized.

【 授权许可】

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