Structural and Optical Properties of Novel Surfactant Coated TiO2–Ag Based Nanoparticles

摘要: Stable dispersions of surfactant-coated TiO2–Ag based nanoparticles in apolar medium have been prepared by performing sequentially the hydrolysis titanium(IV) isopropoxide and reduction Ag+ confined space sodium bis(2-ethylhexyl)sulfosuccinate (NaAOT) reverse micelles. Depending on sequence length, this novel procedure allowed synthesis semiconductor–metal nanoparticles, nominally indicated as TiO2/Ag, TiO2/Ag/TiO2, TiO2/Ag/TiO2/Ag, stabilized a monolayer oriented surfactant molecules. The structural characterization these has performed High Resolution Transmission Electron Microscopy (HR-TEM), while optical properties were investigated UV–Vis absorption fluorescence spectroscopies. TEM investigation showed presence globular with an average diameter about 10 nm composed distinct amorphous TiO2 crystalline Ag glued domains whose structure depends length. measurements highlighted mutual metal–semiconductor influence energy band gap plasmon resonance. Steady-state spectra analysis to reveal strong inhibition electron–hole radiative recombination due appearance new emission centred 484–545 range. Possible attributions involved electronic transition last are discussed.