Synthesis and Characterization of Fluorescent Polymer−Metal Nanocomposites Comprising Poly(silylene-co-silyne)s and Silver Nanoparticles

Branched and Network Polysilanes as Cleavable Macrophotoinitiators

“…The fi lms (20 μ m by UV-Vis and PL (emission) spectroscopy as well as fl uorescence lifetime decay measurements have shown that the extent of the σ -delocalization in the skeletal backbone increases with a higher degree of branching sites in the structural framework. [ 9 ] Network polysilanes, on the other hand, can be considered as soluble models of amorphous silicon and can be represented as two dimensional sheet-like structures with linear, branched, and cyclic components. [10][11][12][13][14][15] These structures are associated with both direct and indirect band gaps of the order of 2-3 eV, which are nearly degenerate.…”

“…[5][6][7][8] Branched and network PS of general formula [(R 2 Si) x (RSi) 1-x ] n and [RSi] n , respectively differ in respect of their composition of the catenated skeletal framework. [ 9 ] The branched PS are composed of both linear and branched units, which act as separated chromophores with distinct photophysical properties. In these polymers, the linear segment exhibits an intense absorption band in the UV region (280-350 nm) due to σ -conjugation along the Si-Si backbone, whereas branched units are characterized by an absorption band with a red tail in the visible region.…”

“…Relevant studies on the optical properties of branched PS coupling conditions (Na dispersion in refl uxing toluene). [ 9 ] The full characterization of the synthesis conditions of these compounds was presented in ref. [ 9 ].…”

“…[ 9 ] The full characterization of the synthesis conditions of these compounds was presented in ref. [ 9 ]. The separation of the high-molecular-weight fraction in each case was achieved by fractional precipitation using a toluene/isopropyl alcohol mixture.…”

A novel method for preparing silver/poly(siloxane‐b‐methyl methacrylate) nanocomposites with multiple properties in the DMF‐toluene mixture solvent

“…23 On the other hand, the incorporation of AgNPs into polymers can greatly improve properties and application potential of the resultant nanocomposites, which not only combines the advantageous properties of silver and polymers but also exhibits many new properties and thus creates new perspective for the development of multifunctional materials. For instance, Shankar et al 24 used branched polysilanes as reducing agents for Ag(I) ions as well as their affinity to function as the scaffolds for in situ generation of metal nanoparticles, the resultant polymer-silver nanocomposites exhibited room temperature fluorescence. Singh et al 25 have employed in situ reduction of silver in aniline by mild photolysis to prepare silver/polyaniline (Ag-PANi) nanocomposites which are not only a promising candidate for electrocatalytic hydrazine oxidation but also can be used in other biosensing applications.…”