Synthesis and characterization of bifuntional magnetic-optical Fe<inf>3</inf>O<inf>4</inf>@Hollow@ZnS core-shell microspheres

Key Words:Sulfur compounds;Energy transfer - Fluorescence - Fluorescence quenching - II-VI semiconductors - Iron oxides - Microspheres - Photocatalysis - Quenching - Silica - Zinc sulfide;Blue light emissions - Core-shell microspheres - Core/shell - Fluorescence spectrophotometer - Hollow structure - Magnetic-optical - Photocatalytic property - Synthesis and characterizations

Abstract:Bifunctional Fe<inf>3</inf>O<inf>4</inf>@ZnS microspheres with hollow heterostructures have been successfully fabricated by a simple hard-templating method. XRD, TEM, MPMS, and fluorescence spectrophotometer had been to investigate the as-prepared materials. The results showed that there is controllable hollow structure between Fe<inf>3</inf>O<inf>4</inf>cores and ZnS layer. The Ms values of Fe<inf>3</inf>O<inf>4</inf>and Fe<inf>3</inf>O<inf>4</inf>@Hollow@ZnS microspheres are 86.2 emu/g and 53.1 emu/g at 300 K, respectively. When excited by 353 nm low-power UV lamps, the composites have a broad blue light emission band between 440 and 500 nm. As the hard template, the amorphous SiO<inf>2</inf>plays a key role in the forming process of the hollow structure. The presence of the hollow structures blocks the energy transfer between ZnS and Fe<inf>3</inf>O<inf>4</inf>particles, which reduces the probability of fluorescence quenching. Furthermore, the hollow cavity size of the microspheres can be easily controlled by adjusting the thickness of SiO<inf>2</inf>layer, which can affect the photocatalytic properties.<br/> &copy; 2018 Elsevier B.V.

Volume:212

Translation or Not:no