title: Hg(II)-activated emission "turn-on" chemosensors excited by up-conversion nanocrystals: synthesis, characterization and sensing performance.
abstract: In this paper, two emission "turn-on" chemosensors for Hg(II) sensing were designed and synthesized. Up-conversion NaYF4 nanocrystals were prepared and used as the excitation host for both chemosensors. Spectral analysis suggested that there should be an efficient energy transfer between the host and the chemosensors, which was then confirmed by excited state lifetime analysis. Then two sensing systems using this up-conversion host and the two chemosensors were constructed, their sensing performance for Hg(II) ions was then studied. It was found that the probe emission intensity increased with increasing Hg(II) concentrations, showing an emission "turn-on" effect. Good selectivity and linear response were observed from both sensing systems.
authors.affiliation: School of Physics and Electronic Science, Fuyang Teachers College, Fuyang, Anhui 236037, China. Electronic address: shigangli01@163.com.
authors.forename: Shigang
authors.initials: S
authors.lastname: Li
authors.affiliation: School of Physics and Electronic Science, Fuyang Teachers College, Fuyang, Anhui 236037, China.
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Zhao
authors.affiliation: School of Chemical and Chemical Engineering, Fuyang Teachers College, Fuyang, Anhui 236037, China. Electronic address: tdlpku@163.com.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Tao
authors.affiliation: School of Chemical and Chemical Engineering, Fuyang Teachers College, Fuyang, Anhui 236037, China.
authors.forename: Wenbao
authors.initials: W
authors.lastname: Zhang
authors.affiliation: School of Chemical and Chemical Engineering, Fuyang Teachers College, Fuyang, Anhui 236037, China.
authors.forename: Kaiyin
authors.initials: K
authors.lastname: Zhang
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation / Q000379:methods*; D060326:Chemistry Techniques, Synthetic; D005456:Fluorescent Dyes / Q000737:chemistry; D008628:Mercury / Q000032:analysis* / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D014961:X-Ray Diffraction
chemical_list: D005456:Fluorescent Dyes; D012235:Rhodamines; D008628:Mercury
keywords: Hg(II); Rhodamine derivative; Sensor; Up-conversion nanocrystals