Ultra-bright emission from Sr doped TiO 2 nanoparticles through r-GO conjugation

Abstract

Graphene and semiconductor nanocomposite garnered much interest in nanoscience and nanotechnology. In this research, TiO 2 , TiO 2 : Sr and TiO 2 : Sr/r-GO (reduced graphene oxide) nanocomposites have been successfully synthesized via a wet chemical synthesis method. The microscopic studies confirmed the formation of graphene sheets which looked like a paper which could easily wrap over the bacterial surface killing them. The optical band gap of these nanocomposites is determined by UV-visible absorption spectra which inferred that optical band gap decreases with Sr2ϵ incorporation and r-GO attachment. Furthermore, photoluminescence (PL) study revealed that the intensity of emission is prominent for TiO 2 : Sr/r-GO. The enhancement in PL intensity with r-GO is due to creation of more oxygen vacancies and defects which generally capture the photoinduced carriers inhibiting recombination rate of free carriers promoting the photocatalytic reactions.