Growth of Metal Nanoparticles in a Sol‐Gel Silica Thin Film

Abstract

Silica films on glass substrates with homogeneously dispersed platinum, gold or silver nanoparticles were prepared by sol-gel processing mixtures of tetraethoxysilane and {3-[(2-aminoethyl)amino]propyl}triethoxysilane complexes of

Optical self-trapping in a photopolymer doped with Ag nanoparticles: a single-step route to metallodielectric cylindrical waveguides

“…With increasing concentrations of [Ag(I)], the oscillatory frequency appeared to increase. In these materials (for example, the photopolymer with AgI 2.0 mM), the onset of high order modes was considerably more sequential in terms of the order of the modes; at early times, the fundamental mode LP 01 was followed by LP 11 at 40 s. Transitions between the modes were well resolved, and the highest order mode observed was LP 31 .…”

“…Particular effort has been devoted to generating stable dispersions of metal nanoparticles in soft dielectric matrices, which can then be facilely processed into optical device configurations. To this end, metal nanoparticles have been incorporated in dendrimers [20,21], polymers [22][23][24][25][26][27][28], surfactants [29,30], and sol-gel-derived materials [31][32][33][34][35][36]. Such metallodielectric systems hold promise for surface-enhanced spectroscopic techniques [37][38][39], optical sensing and imaging [40][41][42], photonics [43][44][45], and optical switching devices [16,46,47].…”

A Seedless Method for Gold Nanoparticle Growth inside a Silica Matrix: Fabrication of Materials Capable of Third‐Harmonic Generation in the Near‐Infrared

“…These complexes are solubilized in the micelles, which leads to the formation of the metalomicelles. [37] In many respects the discussed process resembles at this stage the solgel processes combined with tethering of metal ions, studied by Shubert et al [22,27,28] The difference is that here the Au 3 + ions are complexed not by silica precursor, but by the surfactant micelles.…”

“…In the last case, the as prepared silica is typically impregnated with metal precursor,, followed by its reduction in high temperature (e. g., at 400 °C, employing H 2 as reducing agent). An interesting alternative to such an approach is a sol‐gel method combined with tethering of metal ions,, in which metal precursors (Au, Ag, or Pt ions) are initially complexed by silica precursor. As a result, the metal ions are homogeneously distributed within the resulting silica matrix.…”

“…[13,15,[17][18][19] The commonly used methods of doping silica glasses with NPs, especially gold NPs (AuNPs), include: ion implantation, [20] ion exchange methods, [16] or sol-gel processes. [17,[21][22][23][24][25] In the last case, the as prepared silica is typically impregnated with metal precursor, [21,26] followed by its reduction in high temperature (e. g., at 400°C, employing H 2 as reducing agent). An interesting alternative to such an approach is a sol-gel method combined with tethering of metal ions [22,27,28] in which metal precursors (Au, Ag, or Pt ions) are initially complexed by silica precursor.…”