Study on Optical of Chitosan-Aminopropyltriethoxysilane-SiO2 Nanocomposite Decorated with Carbon Nanotubes

Abstract

In our study, we examined the growth of SiO2-aminopropyltriethoxysilane nanoparticles decorated with carbon nanotubes (CNTs) on a chitosan matrix. This matrix was synthesized through a sol-gel process, where chitosan was dissolved into a silicate sol and subsequently gelled at 50 °C. To explore the structure, morphology, and optical properties of these semiconductor nanocomposites, we employed various analytical techniques including X-ray diffraction (XRD), transmission electron microscopy (SEM), Fourier Transform Infrared (FT-IR) spectroscopy, and UV-vis spectroscopy. From the UV-Vis spectroscopy measurements, the absorption, band gap, refractive index, and optical conductivity were extracted and analyzed with respect to the incident wavelength and content of CNTs. The incorporation of CNTs into the chitosan-SiO2-aminopropyltriethoxysilane semiconductor nanocomposite results in enhanced crystallinity, increased surface area, and modified optical properties. Therefore, it can be inferred that the optical characteristics of the chitosan-SiO2-aminopropyltriethoxysilane composite are significantly influenced by the ratio of CNT decoration.

Optical properties and antimicrobial of ionic chitosan-MgO-SiO2@ aminolsilane nanocomposites

“…Following the reaction of the active hydroxyl group with the amine or M-O groups, enhancements to the chitosan-MgO-silica loaded with (0.1, 0.3, 0.5) aminosilane structure include the introduction of carboxymethyl and M-O groups. This transformation is evident in the FTIR spectra (figure 6), with prominent characteristic peaks observed for OH and chitosan-based groups at 3449 cm −1 (N-H stretch of -NH 2 groups overlapping with O-H stretch), 2927 cm −1 (C-H) stretch), 1384 cm −1 (-C-N stretch), and 1077 cm −1 (M-O and C-O stretch) [2,52,68,69]. The FTIR band at 2927 cm −1 corresponds to the CH 2 groups as an asymmetric stretching vibration in chitosan-based composite [42,70].…”

“…Polymer nanocomposites (PNCs) hold particular fascination due to their ability to demonstrate enhanced properties compared to traditional composites, even at relatively low concentrations of nanoscale reinforcements [1][2][3][4]. Yet, the complexities inherent in PNCs revolve around managing the composition and spatial arrangement of reinforcements within the polymer matrix.…”

“…Chitosan consists of b-(1, 4)-2-acetamido-2-deoxy-b -d-glucose, also known as N-acetyl-D-glucosamine [2] . The C-2 position is filled with N-acetyl groups that form hydrogen bonds in three dimensions, resulting in a stack-like structure for chitin.…”

“…Chitosan plays a crucial role in the preparation of nanocomposites by serving as a host matrix template or scaffold material. Its unique properties, such as biocompatibility, different functional groups, biodegradability, antimicrobial activity, and chemical modification make it a suitable system for introducing different constituents such as nanoceramic, nanoparticles, and/or organic molecules [2,49,50]. Chitosan delivers a stable environment for the immobilization and dispersion of various nanoparticles, improving their stabilization and functionality.…”