Synthesis and characterization of N, O-donor Schiff base capped ZnS NPs as a sensor for fluorescence selective detection of Fe 3+, Cr 2+ and Cd 2+ ions

Abstract

We report the simple synthesis of zinc sulfide nanoparticles (ZnSNPs) by a co-precipitation method using Schiff base, (2-[(4-methoxy-phenylimino)-methyl]-4-nitro phenol) as a capping agent. Here, Schiff base is also used as N, O-donor ligand to control the morphology of NPs and fluorescence interactions. The formation of ZnSNPs and their optical, structural, thermal properties and morphologies were studied by means of UV–vis DRS, fluorescence, FTIR, XRD, SEM, TEM, zeta potential and TGA. The optical properties and quantum confinement effect of the products were confirmed by means of spectroscopic measurements. XRD and TEM image shows that the synthesized ZnSNPs have cubic structures with a diameter of about less than 10 nm. The prepared ZnSNPs exhibited as a selective probe detection of Fe3+, Cr2+ and Cd2+ ions by fluorometrically and the emission band which disappears in the presence of increasing concentrations of Fe3+, Cr2+ and Cd2+ ions. Based on the fluorescence quenching of the NPs in the presence of metal ion of interest, the feasibility of their determinations was examined according to the Stern-Volmer equation. Our work suggested that Schiff base capped ZnSNPs could be a potential selective sensor in the detection of heavy metal ions.

Tuning visible emission of core-shell nanostructure by exchange the inner and outer layer

“…The semiconductor nanostructure materials are of great importance in several technological applications due to their electronic, photoluminescence, optical and thermal properties. In field of nanotechnology the fabrication and design of metal-oxide nanoparticles with sulphide is very great importance due to its tuneable properties for advanced applications and quantum size and surface effects [1][2]. The semiconductor-based nanoparticles such as ZnS, Bi 2 S 3 CdS, CdS/Bi 2 S 3, CdSe, CdSe/Bi 2 S 3 CdS/Fe 3 O 4 , CdS/TiO 2 , ZnO/CdS, ZnO/ZnS, CdIn 2 S 4 , Ag 2 S, Ag 2 S/SiO 2 , Ag 2 S/TiO 2 , Bi 2 S 3 , NiS, CoS, CuS, HgS and PbS have been extensively studied involved in electronics, LED, luminescence, electroluminescence, flat panel displays, infrared windows, sensors, biosensors, lasers, bio-devices and catalytic applications [3][4][5][6][7][8][9][10][11][12][13][14][15].…”