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首页> 外文期刊>Science of advanced materials >Mercaptopropionic Acid Capped CdS@ZnS Nanocomposites: Interface Structure and Related Optical Properties
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Mercaptopropionic Acid Capped CdS@ZnS Nanocomposites: Interface Structure and Related Optical Properties

机译：巯基丙酸封端的CdS @ ZnS纳米复合材料：界面结构和相关的光学性质

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摘要

CdS@ZnS core-shell nanoparticles stabilized by mercaptopropionic acid were prepared by a two-step aqueous synthesis: a hydrothermal route at 180 ℃ and different heating times to prepare the CdS core and the successive ion layer adsorption and reaction method to grow ZnS shell layers. The structure of the composites formed was established from X-ray diffraction and high-resolution transmission electron microscopy data complemented by UV-vis, photoluminescence, energy-disperse X-ray and IR spectra. At the core-shell interface evidence of formation of a solid solution Cd_(1-x)Zn_xS was obtained. The interface formed between the ZnS layers and the capping molecule (MPA) appears to be amorphous. The optical properties of the resulting nanostructures were evaluated from UV-vis and photoluminescence spectra. The recorded spectral information supports the nature of the core-shell structure and of the interface regions. Photoluminescence peak showed a blue shift of about 20 nm relative to the emission peak for the precursor CdS core and an increase of 3 times in its intensity. Such a blue shift was ascribed to the Cd_(1-x)Zn_xS solid solution formation at the core-shell interface. The CdS@ZnS obtained composite remains stable for weeks within the aqueous solution. The formation of fluorescent nanostructures stable in aqueous media is highly desirable in many potential applications, including biological labels.
机译：巯基丙酸稳定的CdS @ ZnS核壳纳米粒子是通过两步水合成法制备的：在180℃水热路径和不同的加热时间制备CdS核，并通过连续的离子层吸附和反应方法生长ZnS壳层。形成的复合物的结构是由X射线衍射和高分辨率透射电子显微镜数据建立的，并辅以UV-vis，光致发光，能量分散X射线和IR光谱。在核-壳界面处获得形成固溶体Cd_（1-x）Zn_xS的证据。 ZnS层和封盖分子（MPA）之间形成的界面似乎是非晶态的。从紫外可见光谱和光致发光光谱评估所得纳米结构的光学性质。所记录的光谱信息支持核-壳结构和界面区域的性质。相对于前驱体CdS核的发射峰，光致发光峰显示出约20 nm的蓝移，其强度增加了3倍。这种蓝移归因于核-壳界面处的Cd_（1-x）Zn_xS固溶体形成。获得的CdS @ ZnS复合材料在水溶液中可保持稳定数周。在包括生物标记物在内的许多潜在应用中，非常需要在水性介质中形成稳定的荧光纳米结构。

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  • 来源
    《Science of advanced materials》 |2012年第7期|p.771-779|共9页
  • 作者

    O. Estevez-Hernandez; J. Gonzalez; J. Guzman; P. Santiago-Jacinto; L. Rendon; E. Montes; E. Reguera;

  • 作者单位

    Centro de Investigation en Ciencia Aplicada y Tecnologia de Avanzada, IPN, Legaria 694,Mexico, D.F., C. P. 11500, Mexico,lnstituto de Ciencia y Tecnologia de Materiales (IMRE), Universidad de La Habana, C. P. 10400, Cuba;

    Centro de Investigation en Ciencia Aplicada y Tecnologia de Avanzada, IPN, Legaria 694,Mexico, D.F., C. P. 11500, Mexico,lnstituto de Ciencia y Tecnologia de Materiales (IMRE), Universidad de La Habana, C. P. 10400, Cuba;

    Centro de Investigation en Ciencia Aplicada y Tecnologia de Avanzada, IPN, Legaria 694,Mexico, D.F., C. P. 11500, Mexico;

    lnstituto de Fisica, Universidad National Autonoma de Mexico, Mexico D.F., C. P. 04510, Mexico;

    lnstituto de Fisica, Universidad National Autonoma de Mexico, Mexico D.F., C. P. 04510, Mexico;

    Centro de Investigation en Ciencia Aplicada y Tecnologia de Avanzada, IPN, Legaria 694,Mexico, D.F., C. P. 11500, Mexico;

    Centro de Investigation en Ciencia Aplicada y Tecnologia de Avanzada, IPN, Legaria 694,Mexico, D.F., C. P. 11500, Mexico;

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  • 正文语种 eng
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  • 关键词

    nanocomposites; semiconductor; cadmium sulfide; zinc sulfide; photoluminescence; core-shell nanostructure; quantum dots;

    机译：纳米复合材料半导体;硫化镉硫化锌光致发光核-壳纳米结构;量子点;

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