title: On two site-specific nitrite-sensing nanocomposites having a core-shell structure: Construction, characterization and sensing performance.
abstract: This paper reported two site-specific nitrite-sensing nanocomposite samples having a core-shell structure, where Fe3O4nanoparticles 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, N2adsorption/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.
authors: College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, China.
authors: Muhetaer
authors: M
authors: Kadeerhazi
authors: Department of Applied Science, University of Otago, Dunedin 9054, New Zealand.
authors: Azam
authors: A
authors: Ali
authors: Department of Food Science, University of Otago, Dunedin 9054, New Zealand. Electronic address: BekhitAED071@163.com.
authors: Alaa El-Din
authors: AE
authors: Bekhit
keywords: Core-shell structure; Emission quenching; Nitrite ion; Rhodamine probe