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Organic-inorganic hybrid fluorescent sensor thin films of rhodamine b embedded ag-sba 15 for selective recognition of Hg(Ⅱ)ions in water

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Chinese Chemical Letters 2017年第7期28卷 1399-1405页

作者： banupriya Cinnasamy Srinivasan Krishnan Rajasekar Aruliah Murugan Kadarkarai Giovanni benelli Dinakaran Kannaiyan Department of Chemistry Thiruvalluvar UniversityVellore632115India Department of biotechnology Thiruvalluvar UniversityVellore632115India Department of Zoology Bharathiar UniversityCoimbatore641046India Department of agriculture Food and EnvironmentUniversity of PisaPisa 56124Italy ThebioRobotics Institute Sant'Anna School of Advanced StudiesPontedera 56025Italy

Nowadays, the rapid and effective detection of low doses of heavy metal pollutants in contaminated water is a timely challenge in environmental pollution research. In this study, a rapid and highly sensitive assay for the detection of Hg^2＋based on quenching of metal-enhanced fluorescence of rhodamine b（Rb）has been fabricated. Rb and silver nanoparticle were incorporated into the mesoporous siliceous framework spin cast on a quartz glass through post-synthetic incorporation method. The morphology and crystallinity of mesoporous structure and ag nanoparticle were characterized by transmission electron microscopy and X-ray diffraction analyses. Photoluminescence assays on the hybrid thin film of Rb-ag-sba15 showed a high enhancement when compared to the intensity of silver free sba15-Rb in the wavelength of 575 nm. The fluorescence of Rb-ag-sba15 thin film decreased gradually with the increase in the concentration of Hg^2＋and the detection limits were 10.54 nmol/L. Furthermore, the fluorescence intensity increased linearly with the concentration of Hg^2＋in the range from 1.0 ×10^-8mol/L to10× 10^-8mol/L, with a response time of a few seconds. In addition, this system offers a high selectivity over interfering cations such as Cd^2＋ and Pb^2＋. Overall, we have developed an optical assay having a wellordered mesoporous sba15 containing ag-Rbfor selective detection of Hg^2＋in aqueous solution. The scheme combines the advantages of specific binding interactions between Hg^2＋and Rb molecule and optical emission properties of Rb. The method is suitable for a single-shot and irreversible analytical assay in a quartz glass/microtiter plate.

关键词： mercury sensor metal enhanced fluorescence rhodamine b ag nanoparticles sba15 fluorescence quenching

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