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Mesoporous Silica Spheres as Microreactors for Performing CdS Nanocrystal Synthesis

机译：介孔二氧化硅球作为用于CdS纳米晶体合成的微反应器

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CdS nanoparticles were exclusively synthesized in the pores of mesoporous silica (MS) particles that had been coated with two bilayers of poly(allylamine hydrochloride) (PAH)/poly(styrene sulfonate) (PSS) via the layer-by-layer (LbL) self-assembly technique. The PAH/PSS multilyers film could prevent generation of nanocrystals outside the MS spheres. After removal of the silica cores, US nanocrystal encapsulated microcapsules were obtained confirming that numerous US nanocrystals were successfully formed. The sizes of the US nanocrystals were mainly determined by the pore size of the MS spheres. After being treated with a mixed solution of three salts including NaCl, LiCl, and KNO3, the MS spheres showed two different pore sizes of 3.2 and 9.7 nm. Thus, two differently sized (3.2 nm, 6.8 nm) US nanocrystals were formed in the pores of MS spheres. This result is believed to explain the photoluminescence (PL) band originating from hand-to-hand transition. Measurements and analysis of X-ray diffraction, transmission electron microscopy, high-resolution TEM, photoluminescence spectra and confocal laser scanning microscopy showed that the US nanocrystals were almost perfectly inserted into the pores of the MS spheres and had good crystallinity, which created a fluorescence emission. This approach can be used to prepare composite materials involving functional inorganic natioparticles, which have potential application in biological immunoassay and photoelectronic fields.
机译：CdS纳米颗粒是在介孔二氧化硅（MS）颗粒的孔中专门合成的，介孔二氧化硅（MS）颗粒已通过逐层（LbL）涂有两层聚二烯丙胺盐酸盐（PAH）/聚（苯乙烯磺酸盐）（PSS）自组装技术。 PAH / PSS多层膜可以防止在MS球体外部产生纳米晶体。去除二氧化硅核后，获得US纳米晶体封装的微囊，证实了许多US纳米晶体已成功形成。 US纳米晶体的尺寸主要取决于MS球的孔径。用三种盐（包括NaCl，LiCl和KNO3）的混合溶液处理后，MS球显示出3.2和9.7 nm的两种不同孔径。因此，在MS球的孔中形成了两个大小不同（3.2 nm，6.8 nm）的US纳米晶体。认为该结果解释了源自手到手过渡的光致发光（PL）带。 X射线衍射，透射电子显微镜，高分辨率TEM，光致发光光谱和共聚焦激光扫描显微镜的测量和分析表明，US纳米晶体几乎完美地插入了MS球体的孔中，并具有良好的结晶度，从而产生了荧光。排放。该方法可用于制备涉及功能性无机纳米粒子的复合材料，这些材料在生物免疫测定和光电子领域具有潜在的应用。

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