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Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib

Various filling fractions of silver silica nanocomposites (Ag-SiO2 NC) were successfully synthesized via sol-gel technique and deposited onto indium tin oxide via electrophoretic deposition (EPD). The size of Silver Nanoparticles (AgNPs) synthesized by reduction method was determined to be within 20...

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Main Author: Taifunisyam , Taib
Format: Thesis
Published: 2023
Subjects:
Q Science (General)
QC Physics
Online Access:http://studentsrepo.um.edu.my/15101/2/Taifunisyam.pdf
http://studentsrepo.um.edu.my/15101/1/Taifunisyam_Taib.pdf
http://studentsrepo.um.edu.my/15101/
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spelling my.um.stud.151012024-11-12T19:37:23Z Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib Taifunisyam , Taib Q Science (General) QC Physics Various filling fractions of silver silica nanocomposites (Ag-SiO2 NC) were successfully synthesized via sol-gel technique and deposited onto indium tin oxide via electrophoretic deposition (EPD). The size of Silver Nanoparticles (AgNPs) synthesized by reduction method was determined to be within 20-30 nm, homogeneous and spherical in shape observed from Transmission electron microscopy (TEM) images. TEM images also confirmed that the particle distance between AgNPs in the Ag-SiO NC varies according to the filling fractions. The increase in crystalline phase was observed by the increase of peaks intensity of X-ray diffraction (XRD) spectra as the increase of AgNPs amount in the nanocomposites. UV–vis spectroscopy shows that the intensity of the Ag–SiO2 NCs peak is greatly reduced with a clear and sharp absorption peak. The Fourier-transform Infrared (FTIR) spectra shows similar peaks for all the various filling fractions of Ag-SiO2 NC. However the peaks shown slightly shifted indicating the existence of the AgNP within the silica nanostructures. Spectroscopy Ellipsometry shows that the effective permittivity and refractive index obtained from the optimum filling fraction are -0.88 and 0.90, respectively. The use of 4-Aminobenzenethiol (4-ABT) as the probe molecule on the substrate greatly enhances the Surface-enhanced Raman Spectroscopy (SERS) signal of the nanocomposites. The results from different pH values confirm that the substrate is stable and gives the strongest SERS enhancements in alkaline environment. The photoelectrochemical behavior of Ag-SiO2 NC thin films was also investigated. Thin films grown at higher Ag composition showed good photoelectrochemical behavior. 2023-04 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/15101/2/Taifunisyam.pdf application/pdf http://studentsrepo.um.edu.my/15101/1/Taifunisyam_Taib.pdf Taifunisyam , Taib (2023) Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib. PhD thesis, Universiti Malaya. http://studentsrepo.um.edu.my/15101/
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Student Repository
url_provider http://studentsrepo.um.edu.my/
topic Q Science (General)
QC Physics
spellingShingle Q Science (General)
QC Physics
Taifunisyam , Taib
Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib
description Various filling fractions of silver silica nanocomposites (Ag-SiO2 NC) were successfully synthesized via sol-gel technique and deposited onto indium tin oxide via electrophoretic deposition (EPD). The size of Silver Nanoparticles (AgNPs) synthesized by reduction method was determined to be within 20-30 nm, homogeneous and spherical in shape observed from Transmission electron microscopy (TEM) images. TEM images also confirmed that the particle distance between AgNPs in the Ag-SiO NC varies according to the filling fractions. The increase in crystalline phase was observed by the increase of peaks intensity of X-ray diffraction (XRD) spectra as the increase of AgNPs amount in the nanocomposites. UV–vis spectroscopy shows that the intensity of the Ag–SiO2 NCs peak is greatly reduced with a clear and sharp absorption peak. The Fourier-transform Infrared (FTIR) spectra shows similar peaks for all the various filling fractions of Ag-SiO2 NC. However the peaks shown slightly shifted indicating the existence of the AgNP within the silica nanostructures. Spectroscopy Ellipsometry shows that the effective permittivity and refractive index obtained from the optimum filling fraction are -0.88 and 0.90, respectively. The use of 4-Aminobenzenethiol (4-ABT) as the probe molecule on the substrate greatly enhances the Surface-enhanced Raman Spectroscopy (SERS) signal of the nanocomposites. The results from different pH values confirm that the substrate is stable and gives the strongest SERS enhancements in alkaline environment. The photoelectrochemical behavior of Ag-SiO2 NC thin films was also investigated. Thin films grown at higher Ag composition showed good photoelectrochemical behavior.
format Thesis
author Taifunisyam , Taib
author_facet Taifunisyam , Taib
author_sort Taifunisyam , Taib
title Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib
title_short Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib
title_full Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib
title_fullStr Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib
title_full_unstemmed Synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / Taifunisyam Taib
title_sort synthesis and characterization of silver silica nanocomposite materials via sol-gel technique / taifunisyam taib
publishDate 2023
url http://studentsrepo.um.edu.my/15101/2/Taifunisyam.pdf
http://studentsrepo.um.edu.my/15101/1/Taifunisyam_Taib.pdf
http://studentsrepo.um.edu.my/15101/
_version_ 1817842508034473984
score 13.223943

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