A novel europium-sensitive fluorescent nano-chemosensor based on new functionalized magnetic core-shell Fe3O4@SiO2 nanoparticles.
A novel Eu(3+)-sensitive fluorescent chemosensor is introduced. It is based on magnetic core-shell silica nanoparticle which is functionalized by Cinchonidine (CD-Fe3O4@SiO2). The nano-chemosensor was synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-visible absorption and fluorescence emission. The fluorescent nano-chemosensor shows a selective interaction with Eu(3+) ion. Fluorescence studies revealed that the emission intensity of the functionalized magnetic core-shell silica nanoparticles (CD-Fe3O4@SiO2 NPs) increases significantly by addition of various concentrations of Eu(3+) ion. While in case of mono, di, and other trivalent cations, weak changes or either no changes in intensity were observed. The enhancement in fluorescence intensity of nano-chemosensor is because of the strong covalent binding of Eu(3+) ion to CD-Fe3O4@SiO2 NPs with a large binding constant value of 1.7 × 10(5) mol L(-1).
Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran.
Mohammad Reza
MR
Ganjali
Morteza
M
Hosseini
Mehdi
M
Khobi
Shima
S
Farahani
Masoom
M
Shaban
Farnoush
F
Faridbod
Abbas
A
Shafiee
Parviz
P
Norouzi
D002930:Cinchona Alkaloids / Q000737:chemistry*; D005063:Europium / Q000032:analysis*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D059346:Magnets; D046529:Microscopy, Electron, Transmission; D012822:Silicon Dioxide / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared
D002930:Cinchona Alkaloids; D058185:Magnetite Nanoparticles; C041622:cinchonidine; D005063:Europium; D012822:Silicon Dioxide; D052203:Ferrosoferric Oxide
Europium; Fluorescence; Magnetic core–shell silica nanoparticles; Nano-chemosensor