Highly selective and sensitive magnetic silica nanoparticles based fluorescent sensor for detection of Zn2+ ions

Dual functional rhodamine-immobilized silica toward sensing and extracting mercury ions in natural water samples

“…The new adsorption peaks at 2966.2, 2927.6, 2871.6, 1683.6, 1515.8, 1267.1, and 1199.1 originate from the rhodamine, giving us solid evidence that rhodamine block is certainly attached onto the surface of the silica. 45,46 Besides, from the results of TGA experiment on the rhodamineattached silica and free one (Fig. 1), when the samples were heated from room temperature to 900 °C, after the initial weight loss of water molecules, the SGIR series began to lose organic block containing rhodamine group of ca.…”

Magnetic, Fluorescence and Transition Metal Ion Response Properties of 2,6-Diaminopyridine Modified Silica-Coated Fe3O4 Nanoparticles

“…An effective method has been developed recently in which the reagents, which could react with the target and give response signals, were coupled to silane-coupling agent by isothiocyanate or carboxylic acid presented in the molecules and then subsequently co-hydrolyzed in the presence of tetraethoxysilane (TEOS) during the formation of the silica shell coating of the magnetic cores [17,18,19]. Moreover, these functional silanization reagents were also applied to the preparation of surface modifying silica-coated magnetic nanoparticles for use in fluorescent response time delay because the dye or reagent is trapped in the silica shell of such composite materials [20,21,22,23]. All these materials exhibited good magnetic and selective fluorescence response properties for the target ions.…”

Fluorescence ratiometric zinc sensors based on controlled energy transfer

“…Another approach to fluorescence ratiometric zinc sensing involves silica nanoparticles or mesoporous silica, in which zinc sensor molecules and reference fluorophores are grafted to inner or outer surfaces. [63][64][65][66][67][68][69] Alternatively, these fluorescent components may be doped into polyacrylamide host nanoparticles to serve as sensors. 70 The heterogeneous sensors based on nanoscaffolds exhibit robust fluorescence ratiometric responses that benefit from the site isolation effects.…”