Well-dispersed Fe₃O₄@[email protected]₂ nanoparticle was fabricated by encapsulating Ag into yolk-shell structured Fe₃O₄@mSiO₂ composed of superparamagnetic Fe₃O₄ core and mesoporous SiO₂ shell with bi-solvent nanocasting technique using AgNO₃ as the precursor. Ag can dwell in both the cavity between Fe₃O₄ and mesoporous SiO₂ as an asymmetric shell and the mesoporous channel, or exclusively fill the cavity through increasing the reduction temperature of AgNO₃ from 350 to 550 °C. The asymmetric Ag shell proves to be high SERS-sensitive for the detection of methyl blue dispersed in ethanol solution as assisted by magnetically separation, with an enhanced factor of 5.02 × 10⁴. The SERS self-monitoring NaBH₄ reduction of p-nitrothiophenol catalyzed by Ag nanoclusters in the pore channel was further in situ and real-time achieved with an excellent recyclability.

通过双溶剂纳米浇铸技术将Ag包封在由超顺磁性Fe ₃ O ₄核和介孔SiO ₂壳组成的蛋黄壳结构的Fe ₃ O ₄ @mSiO _2中，制备出分散良好的Fe ₃ O ₄ @ [受电子邮件保护] ₂纳米颗粒。使用AgNO ₃作为前体。Ag可以作为非对称壳和介孔通道同时驻留在Fe ₃ O ₄和介孔SiO ₂之间的空腔中，或者通过提高AgNO ₃的还原温度专门填充该空腔。从350到550°C。事实证明，不对称的Ag壳在磁分离辅助下对乙醇溶液中分散的甲基蓝的检测具有很高的SERS敏感性，增强因子为5.02×10 ⁴。Ag纳米团簇在孔道中催化的SERS自监测NaBH ₄对硝基硝基苯酚的还原反应在原位进一步实现了实时性，并且具有出色的可回收性。