Size-controlled one-pot synthesis of fluorescent cadmium sulfide semiconductor nanoparticles in an apoferritin cavity
Size-controlled one-pot synthesis of fluorescent cadmium sulfide semiconductor nanoparticles in an apoferritin cavity
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DOI：
10.1088/0957-4484/19/49/495601
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发表时间：
2008-12-10
期刊：
影响因子：
3.5
通讯作者：
Yamashita, I.
中科院分区：
文献类型：
--
作者：
Iwahori, K.;Yamashita, I.
采用慢化学反应合成法和两步合成法在马脾载脂蛋白(HsAFr)空腔中简单地合成了硫化镉(Cd S)纳米颗粒(NP)。我们发现，当氨水浓度较低时，CDS NP核心合成缓慢，并且在载脂蛋白空腔中形成早熟的CDS NP核心。结果表明，控制氨水浓度可以控制硫化镉纳米粒子的合成，成功地制备出粒径可控的纳米硫化镉纳米粒子，其直径在4.7~7.1 nm之间，分散性较好。X射线粉末衍射仪(XRD)、能谱分析(EDS)和高分辨电子显微镜(HR-TEM)分析表明，所制得的CdS纳米粒子为立方多晶纳米粒子，其光致发光随直径的变化而红移。从重组载铁蛋白中CDS-NP核心合成的研究来看，载铁蛋白的Zeta电位对于脱铁蛋白空腔中的CDS-NP核心的生物矿化是重要的。这些合成的具有不同光致发光性质的硫化镉纳米颗粒将在各种纳米应用中得到广泛的应用。
A simple size-controlled synthesis of cadmium sulfide (CdS) nanoparticle (NP) cores in the cavity of apoferritin from horse spleen (HsAFr) was performed by a slow chemical reaction synthesis and a two-step synthesis protocol. We found that the CdS NP core synthesis was slow and that premature CdS NP cores were formed in the apoferritin cavity when the concentration of ammonia water was low. It was proven that the control of the ammonia water concentration can govern the CdS NP core synthesis and successfully produce size-controlled CdS NP cores with diameters from 4.7 to 7.1 nm with narrow size dispersion. X-ray powder diffraction (XRD), energy dispersive spectroscopy (EDS) analysis and high-resolution transmission electron microscopy (HR-TEM) observation characterized the CdS NP cores obtained as cubic polycrystalline NPs, which showed photoluminescence with red shifts depending on their diameters. From the research of CdS NP core synthesis in the recombinant apoferritins, the zeta potential of apoferritin is important for the biomineralization of CdS NP cores in the apoferritin cavity. These synthesized CdS NPs with different photoluminescence properties will be applicable in a wide variety of nano-applications.