NDLI: Structural and Optical Properties of Novel Surfactant Coated TiO$

Content Provider	Springer Nature Link
Author	Calandra, Pietro Ruggirello, Angela Pistone, Alessandro Turco Liveri, Vincenzo
Copyright Year	2010
Abstract	Stable dispersions of surfactant-coated TiO$_{2}$–Ag based nanoparticles in apolar medium have been prepared by performing sequentially the hydrolysis of titanium(IV) isopropoxide and the reduction of Ag$^{+}$ in the confined space of sodium bis(2-ethylhexyl)sulfosuccinate (NaAOT) reverse micelles. Depending on the sequence length, this novel procedure allowed the synthesis of semiconductor–metal nanoparticles, nominally indicated as TiO$_{2}$/Ag, TiO$_{2}$/Ag/TiO$_{2}$, and TiO$_{2}$/Ag/TiO$_{2}$/Ag, stabilized by a monolayer of oriented surfactant molecules. The structural characterization of these nanoparticles has been performed by High Resolution Transmission Electron Microscopy (HR-TEM), while optical properties were investigated by UV–Vis absorption and fluorescence spectroscopies. TEM investigation showed the presence of globular nanoparticles with an average diameter of about 10 nm composed by distinct amorphous TiO$_{2}$ and crystalline Ag glued domains whose structure depends on the sequence length. UV–Vis absorption measurements highlighted the mutual metal–semiconductor influence on the TiO$_{2}$ energy band gap and on the Ag plasmon resonance. Steady-state fluorescence spectra analysis allowed to reveal the strong inhibition of the electron–hole radiative recombination in the TiO$_{2}$ domains due to the Ag and the appearance of a new emission band centred in the 484–545 nm range. Possible attributions of the involved electronic transition of this last emission are discussed.
Starting Page	767
Ending Page	778
Page Count	12
File Format	PDF
ISSN	10407278
Journal	Journal of Cluster Science
Volume Number	21
Issue Number	4
e-ISSN	15728862
Language	English
Publisher	Springer US
Publisher Date	2010-06-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ag@TiO$_{2}$ nanostructures Optical properties Electron microscopy Inorganic Chemistry Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Biochemistry Condensed Matter Physics Materials Science

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