Abstract
This paper reported two site-specific nitrite-sensing nanocomposite samples having a core-shell structure, where Fe3O4 nanoparticles were used as core, two rhodamine derivatives served as chemosensor and MCM-41 was applied as supporting host, respectively. These composite samples and their structure were analyzed and confirmed SEM/TEM, XRD, N2 adsorption/desorption, magnetic feature, IR and thermogravimetric analysis. Their nitrite sensing performance was discussed based on emission quenching, with limit of detection as low as 1.2μM. Detailed analysis suggested that these composite samples followed a static sensing mechanism based on an additive reaction between NO+ and chemosensors. After being quenched by nitrite, these samples could be recovered by sulphamic acid.
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