title: An optical probe possessing upconversion luminescence and Hg(2+)-sensing properties.
abstract: A Hg(2+)-selective chromophoric upconversion nanosystem is achieved by covalently grafting Rhodamine B hydrazide (RB-hydrazide) onto upconversion luminescent nanorod core-shell structures. The prepared β-NaYF4 nanorods are coated with silica and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDAX), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence spectra. Under 980 nm excitation, the upconversion luminescence is sensitive towards Hg(2+) because RB-hydrazide-Hg can efficiently absorb green upconversion emission. The prepared nanocomposites exhibit high sensitivity and selectivity towards Hg(2+) over other metal ions. These results indicate that this nanosystem could be developed as a promising fluorescence probe for detecting Hg(2+) ions.
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033 (P. R. China), Fax: (+86) 431 86176935; University of Chinese Academy of Sciences, Beijing 100039/(P. R. China).
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.forename: Liming
authors.initials: L
authors.lastname: Zhang
authors.forename: Ligong
authors.initials: L
authors.lastname: Zhang
mesh_terms: D006834:Hydrazines / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D008628:Mercury / Q000032:analysis / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry*
chemical_list: D006834:Hydrazines; D049408:Luminescent Agents; D012235:Rhodamines; C543681:rhodamine B hydrazide; D008628:Mercury
keywords: luminescence; mercury; nanocomposites; optical probes; sensors