One-Pot Synthesis of Ag@TiO₂ Core−Shell Nanoparticles and Their Layer-by-Layer Assembly

Abstract

Silver nanoparticles coated with a uniform, thin shell of titanium dioxide are synthesized via a remarkably simple one-pot route, where the reduction of Ag + to Ag 0 and the controlled polymerization of TiO2 on the surface of silver crystallites take place simultaneously. The prepared dispersions of coated nanoparticles display a surface plasmon band, which is significantly red-shifted with respect to that of bare Ag. Highquality ultrathin films of the core-shell clusters are prepared via layer-by-layer assembly. The nanoparticles are arranged in closely packed layers interlaced with polyelectrolyte producing a stratified core-shell hybrid material with unique structure and catalytic and electron-transport properties.

Size‐Controlled Water‐Soluble Ag Nanoparticles

“…In fact, particles of 1 nm exhibit a SPR (392 nm) that is typical for uncoated Ag nanoparticles, whereas that (434 nm) of the 4-nm sized particle is more characteristic of Ag particles surrounded with a high refractive index shell. [16] Figure 5. UV/Vis spectra of the Ag particles.…”

Structural Evolution of Plasma-Sputtered Core–Shell Nanoparticles for Catalytic Combustion of Methane

“…The XPS spectra of fresh and used Fe@Pd/SiC are shown in Fig.5 and the corresponding binding energies (BE) of each metal and the derived surface atomic ratios are presented in Table 3 However, the intensity of Fe 2p peaks of used Fe@Pd/SiC is larger than the fresh one mainly because large quantity Fe atoms have migrated from cores to the surface of 11 Fe@Pd nanoparticles. The surface atomic ratios shown in Table 3 further confirmed this result.…”

“…Various preparation techniques, such as sequential synthesis and arc discharge, have been proposed for preparation of core-shell structural catalysts [10][11][12][13] . Recently, plasma sputtering deposition has been studied extensively because the technique is feasible and no post-treatment is needed 14,15 .…”

Electrochemical properties of core-shell TiC–TiO2nanoparticle films immobilized at ITO electrode surfaces

“…These include TiO 2 -BaFe 12 O 19 core-shell nanoparticles for improving photo-catalysis 16 and the use of TiO 2 -Ag core-shell structures for catalysis with improved electronic transportation. 17 Other studies describe the use of TiO 2 -silica core-shell colloidal particles for optical trapping applications 18 and the use of TiO 2 coated polystyrene core-shell spheres for electronic ink applications. 19 TiO 2 behaves like an insulator over a wide range of positive potentials.…”