Fabrication And Properties Of LDHs/AgNCs Luminescent Film

In this work, the ultrathin films (UTFs) fabrication of silver nanoclusters functionalized by CTA (or NFR) and layered double hydroxide nanosheets (CTA-AgNCs/LDH?NFR-AgNCs/LDH) via the layer-by-layer (LBL) assembly technique. UV-vis absorption and fluorescence spectra show the uniform growth of the UTFs and the enhancement of interlayer CTA-AgNCs (NFR-AgNCs) upon increasing deposition cycle. SEM image and XRD results indicate that the UTFs possess long-range order stacking in the normal direction of the substrate.The application of fluorescence sensor for the UTFs has been studied.The structure of (CTA-AgNCs/LDH)10 is CTA-AgNCs accommodated between the LDH nanosheets as a monolayer arrangement, their fluorescence turn on response for the detection of melamine was demonstrated.Compared with CTA-AgNCs solution, the UTFs fluorescence intensity has been improved significantly resulted from the localization and confinement effects of LDH nanosheets. Moreover, the (CTA-AgNCs/LDH)10 displays sensor performance for melamine with a linear response range (0.03?M-0.1?M), low detection limit (4nM),high selectivity and good stability.The structure of (NFR-AgNCs/LDH)10 is NFR-AgNCs accommodated between the LDH nanosheets as a bilayer arrangement, the fluorescence of (NFR-AgNCs/LDH)10-Cu2+turn on response for the detection of guanine was demonstrated. Compared with NFR-AgNCs solution, the UTFs fluorescence intensity has been improved significantly resulted from the localization and confinement effects of LDH nanosheets. Moreover, the (NFR-AgNCs/LDH)10-Cu2+displays sensor performance for guanine with a linear response range (1 ?M-10?M), low detection limit (1?M), high selectivity and good stability (R2=0.9960).