The following paper was devoted to two nitrite sensing platforms having a core-shell structure, where Fe₃O₄ nanoparticles were used as core, a silica molecular sieve MCM-41 was constructed as shell and two rhodamine chemosensors were synthesized as probe, respectively. This magnetic core endowed these two sensing platforms with site-specific aggregation ability. They were carefully characterized through their electron microscopy images, porous analysis, magnetic performance, IR curves and thermal stability analysis. Experimental result suggested that these two sensing platforms were sensitive towards nitrite and their emission was quenchable by nitrite. A static sensing mechanism between probe and analyte through an additive reaction was established by emission decay lifetime analysis. These two sensing platforms showed limit of detection as low as 1.2 μM. Additionally, after their nitrite sensing, these two sensing platforms and their emission could be recovered by sulphamic acid, realizing recyclability.

以下论文专门介绍了两个具有核-壳结构的亚硝酸盐传感平台，其中Fe ₃ O ₄以纳米颗粒为核，以二氧化硅分子筛MCM-41为壳，合成了两种若丹明化学传感器作为探针。该磁芯赋予这两个传感平台特定的聚集能力。通过电子显微镜图像，多孔分析，磁性能，IR曲线和热稳定性分析对它们进行了仔细表征。实验结果表明，这两个传感平台对亚硝酸盐敏感，其发射可被亚硝酸盐淬灭。通过发射衰减寿命分析，建立了通过加成反应在探针和分析物之间的静态传感机制。这两个传感平台的检测限低至1.2μM。此外，在检测到亚硝酸盐后，