Silver nanoparticles (NPs) are installed into a porphyrinic zirconium-based metal–organic framework (Zr-MOF), NU-902, through a postsynthetic modification followed by an ion-exchange process. Both the framework-immobilized Ag(I) ions and partially reduced silver NPs confined within the nanopores of NU-902 with the size of around 3 nm are found in the obtained composite. As both the silver NPs and porphyrinic linkers of NU-902 are electrocatalysts for the oxidation of nitrite, the obtained nanocomposite can be applied for the electrochemical nitrite sensor, and the resulting sensing performance is significantly better than that of the pristine porphyrinic Zr-MOF.

中文翻译：

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卟啉金属有机骨架中孔隙受限的银纳米粒子的电化学亚硝酸盐检测

通过纳米粒子的后合成修饰和离子交换过程，将纳米银颗粒（NPs）安装到卟啉锆基金属有机框架（Zr-MOF）中，即NU-902。在获得的复合物中发现了骨架固定的Ag（I）离子和局限在NU-902纳米孔内的部分还原的银纳米颗粒，其大小约为3 nm。由于NU-902的银纳米颗粒和卟啉连接基均是亚硝酸盐氧化的电催化剂，因此所得的纳米复合材料可用于电化学亚硝酸盐传感器，所得到的传感性能明显优于原始的卟啉Zr-MOF。