Preparation, characterization and luminescence of (SBA-15)-Ag2 S nanocomposite material

SBA-15 mesoporous molecular sieve was prepared using triblock copolymer poly (ethylene glycol)-block-poly (propylene glycol)-block (poly ethylene glycol) as the template, tetraethyl orthosilicate as the silica source in acidic medium. Through toluene/water two-phase interface, nano Ag2S guest has been synthesized. By thermal diffusion method, (SBA15)-Ag2S host-guest nanocomposite material was prepared. The results of powder X-ray diffraction (XRD) showed that the silver sulfide assembled did not destroy the molecular sieve skeleton and the host-guest nanocomposite prepared still maintained good crystallinity. Infrared spectra showed that the host molecular sieve skeleton in the composite material was intact. Transmission electron microscopic results showed that the pores of SBA-15 after loading of Ag2S were obvious and not damaged. The nitrogen adsorption-desorption results at 77 K showed that the guest has already partly occupied the molecular sieve pores, which led to the decrease in the pore volume and specific surface area to some extent. UV-Vis reflection spectra showed that Ag2S molecules were well assembled into SBA-15 and the molecules presented a highly dispersed state. The luminescent research results showed that the (SBA-15)-Ag2S nanocomposites after the encapsulation have luminescent phenomena and the luminescence is stronger than that of the Ag2S. The (SBA-15)-Ag2S nanocomposites have obvious emission peaks at 425 nm, which has a potential applied prospect as a light emitting diode etc optical material.