Fluorescent and Mechanical Properties of Silicon Quantum Dots Modified Sodium Alginate-Carboxymethylcellulose Sodium Nanocomposite Bio-Polymer Films

Abstract

Highly luminescent silicon quantum dots (SiQDs) were prepared via one-pot hydrothermal route. Furthermore, the optimal synthetic conditions, dependence of the emission spectrum on the excitation wavelength and fluorescent stability of SiQDs were investigated by fluorescence spectroscopy. SiQDs exhibited bright blue fluorescence, and photoluminescence (PL) lifetime is 10.8 ns when excited at 325 nm. The small-sized SiQDs (~3.3 nm) possessed uniform particle size, crystal lattice spacing of 0.31 nm and silicon (111), (220) crystal planes. Luminescent SiQDs/sodium alginate (SA)-carboxymethylcellulose sodium (CMC) nanocomposite bio-polymer films were successfully fabricated by incorporating SiQDs into the SA-CMC matrix. Meanwhile, SiQDs not only impart strong fluorescence to the polymer, but also make the composite films have favorable toughness.

A mechanistic study of the fire performance of the silica and zinc borate nanoparticles‐incorporated intumescent coatings based on epoxy resin

“…Each characteristic peak in Si spectra shifts toward the higher binding energy either by moving from the top surface to the internal of the char or by increasing the heating time. [42][43][44][45] generally, crystalline-graphite structures increase with time, however, carbon on the surface is inclined to become aliphatic, and conversely, in the char bulk, carbon is inclined to become polyaromatic over time. This is the primary reason for the decline in the quality of char surface and the increase in the quality of char bulk.…”