Structural, Optical, and Morphological Characterization of Silica Nanoparticles Prepared by Sol-Gel Process

Authors : Most Nilufa YEASMİN, Munira SULTANA, Ayesha SİDDİKA, Samia TABASSUM, Saeed MAHMUD ULLAH, Muhammad Shahriar BASHAR

Pages : 1323-1334

Doi:10.18596/jotcsa.1071086

View : 12 | Download : 13

Publication Date : 2022-11-30

Article Type : Research Paper

Abstract :In the current years, silica nanoparticles have become more favorable in various disciplines like medicine, nano-biotechnology, the food industry, and drug delivery due to their tunable physicochemical characteristics. In this paper, the silica nanoparticles were synthesized by hydrolysis and condensation of tetra-ethyl-ortho-silicate insert ignore into journalissuearticles values(TEOS); in an ethanolic medium using ammonia as a stimulator in the reaction. The chemical bond structures of silica nanoparticles were analyzed by Fourier Transform Infrared Spectroscopy insert ignore into journalissuearticles values(FT-IR); which confirmed the existence of the Si-O bonds according to the different absorption peaks of the samples. The amorphous structure of these nanoparticles was certified by finding the board peaks in the X-Ray Diffraction insert ignore into journalissuearticles values(XRD); patterns. The elemental chemical composition of silica nanoparticles was investigated by Energy Dispersive X-Ray Spectroscopy insert ignore into journalissuearticles values(EDX); where 61.48wt % of silicon and 23.48wt% of oxygen were found. Almost round-shaped spherical and uniform silica nanoparticles with smooth surfaces were investigated by Scanning Electron Microscopy insert ignore into journalissuearticles values(SEM); measurement. The different particle sizes of silica nanoparticles within the range of 95±5.59 to 280±7.8 nm were found by controlling the concentration of TEOS. The optical absorption spectra and band gap calculations were also analyzed by Ultraviolet-Visible insert ignore into journalissuearticles values(UV-Vis); spectrophotometry for the different concentrations of TEOS. The results revealed that with increasing the concentration of TEOS, the absorption spectra of silica nanoparticles increased and their optical bandgap decreased from 3.92 eV to 3.79 eV.
Keywords : silica nanoparticles, TEOS, sol gel process, amorphous, spherical