View in EDS

Analysis of the morphology, structure and optical properties of 1D SiO2 nanostructures obtained with sol-gel and electrospinning methods.

Saved in:
Bibliographic Details
Title: Analysis of the morphology, structure and optical properties of 1D SiO2 nanostructures obtained with sol-gel and electrospinning methods.
Authors: Matysiak, Wiktor1 (AUTHOR) wiktor.matysiak@polsl.pl, Tański, Tomasz1 (AUTHOR)
Source: Applied Surface Science. Sep2019, Vol. 489, p34-43. 10p.
Subjects: Optical properties, Sol-gel processes, Silicon nanowires, Nanostructures, Transmission electron microscopes, Optical control, Polyethylene fibers, Semiconductor nanowires
Abstract: The aim of the study was the production of ceramic SiO 2 nanowires using the sol-gel and electrospinning methods from a PVP/TEOS/AcOH/EtOH solution. The obtained fibrous mats underwent preliminary drying at room temperature. Then, they were subjected to the calcination process in air to obtain pure amorphous silicon dioxide nanowires. A scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS) was used in order to carry out an analysis of the morphology and chemical composition of the resulting nanowires. A high-resolution transmission electron microscope (TEM) was used along with X-ray diffraction analysis (XRD) in order to analyse the structure of the obtained materials. Besides, thermogravimetric analysis (TGA) was performed to show polymer concentration loss in the function of temperature in the obtained two types of PVP/SiO 2 nanofibers. The analysis of the optical properties and the energy band gap of the prepared nanowires was determined by spectral analysis using a UV–Vis spectrophotometer. Using the method proposed by the authors and the recorded absorbance spectra determined the banded refractive index n, real n′ and imaginary k part of the refractive index as a function of the wavelength, complex dielectric constant ε, real and imaginary part ε r and ε i of the dielectric constant as a function of the wavelength of the SiO 2 nanowires. The obtained results, which were as follows: energy band gap of 3.93–3.97 eV, complex refractive index coefficient values of 1.52–1.65 and dielectric constant in the range of 2.30–2.73, suggest the possibility to control the morphology and optical properties of the produced nanomaterial. • The PVP/SiO2 composite nanofibers and SiO2 nanowires obtained using the electrospinning and sol-gel methods • The effect of process parameters on their morphology was investigated • The effect of share of precursors and process parameters on their optical properties were investigated [ABSTRACT FROM AUTHOR]
Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:The aim of the study was the production of ceramic SiO 2 nanowires using the sol-gel and electrospinning methods from a PVP/TEOS/AcOH/EtOH solution. The obtained fibrous mats underwent preliminary drying at room temperature. Then, they were subjected to the calcination process in air to obtain pure amorphous silicon dioxide nanowires. A scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS) was used in order to carry out an analysis of the morphology and chemical composition of the resulting nanowires. A high-resolution transmission electron microscope (TEM) was used along with X-ray diffraction analysis (XRD) in order to analyse the structure of the obtained materials. Besides, thermogravimetric analysis (TGA) was performed to show polymer concentration loss in the function of temperature in the obtained two types of PVP/SiO 2 nanofibers. The analysis of the optical properties and the energy band gap of the prepared nanowires was determined by spectral analysis using a UV–Vis spectrophotometer. Using the method proposed by the authors and the recorded absorbance spectra determined the banded refractive index n, real n′ and imaginary k part of the refractive index as a function of the wavelength, complex dielectric constant ε, real and imaginary part ε r and ε i of the dielectric constant as a function of the wavelength of the SiO 2 nanowires. The obtained results, which were as follows: energy band gap of 3.93–3.97 eV, complex refractive index coefficient values of 1.52–1.65 and dielectric constant in the range of 2.30–2.73, suggest the possibility to control the morphology and optical properties of the produced nanomaterial. • The PVP/SiO2 composite nanofibers and SiO2 nanowires obtained using the electrospinning and sol-gel methods • The effect of process parameters on their morphology was investigated • The effect of share of precursors and process parameters on their optical properties were investigated [ABSTRACT FROM AUTHOR]
ISSN:01694332
DOI:10.1016/j.apsusc.2019.05.090