In this study, we report a facile method to fabricate silica-silver (SiO₂/ PG-Fe³⁺/Ag) core–shell composite microspheres. The surface of SiO₂ microspheres is functionalized with pyrogallol-ferric ions (PG-Fe³⁺) complexes, then Ag ions are reduced to Ag nanoparticles in situ onto the surface of SiO₂ microspheres by electroless plating process. The Ag nanoparticles were uniformly coated on the surface of the SiO₂ microspheres and formed a distinctive layer, which was confirmed by scanning electron microscopy characterization. The chemical compositions and microstructures of the microspheres were investigated by X-ray photoelectron spectroscopy and X-ray diffraction, respectively. The electrical conductivity of the prepared SiO₂/ PG-Fe³⁺/Ag core–shell microspheres was about 1000 S/cm. When the microspheres were filled in methyl vinyl silicone rubber (MVQ), the obtained composites showed good mechanical and electrical properties, indicating their potential applications as conductive and electromagnetic shielding materials.

中文翻译：

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邻苯三酚-Fe（Ш）配位表面官能化制备高电导率的银包覆二氧化硅微球

在这项研究中，我们报告了一种简便的方法来制造二氧化硅-银（SiO ₂ / PG-Fe ³⁺ / Ag）核-壳复合微球。用邻苯三酚-铁离子（PG-Fe ³⁺）配合物对SiO ₂微球表面进行功能化，然后通过化学镀工艺将Ag离子原位还原为Ag纳米颗粒到SiO ₂微球表面。将Ag纳米颗粒均匀地涂覆在SiO ₂的表面上微球并形成一个独特的层，这通过扫描电子显微镜表征得到了证实。通过X射线光电子能谱和X射线衍射分别研究了微球的化学组成和微观结构。制备的SiO ₂ / PG-Fe ³⁺ / Ag核-壳微球的电导率约为1000 S / cm。当将微球填充到甲基乙烯基硅橡胶（MVQ）中时，所获得的复合材料显示出良好的机械和电气性能，表明它们作为导电和电磁屏蔽材料的潜在应用。