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Synthesis of silicone carbide nanowhiskers by microwave irradiation method

Master of Science in Nanomaterial Engineering

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Bibliographic Details
Main Author: Suhaimi, Mat Kahar
Other Authors: Voon, Chun Hong, Dr.
Format: Thesis
Language:English
Published: Universiti Malaysia Perlis (UniMAP) 2018
Subjects:
Silicon carbide
Silica
Silicon compounds
Microwave heating
Nanotechnology
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/76729
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spelling my.unimap-767292022-11-08T02:44:20Z Synthesis of silicone carbide nanowhiskers by microwave irradiation method Suhaimi, Mat Kahar Voon, Chun Hong, Dr. Silicon carbide Silica Silicon compounds Microwave heating Nanotechnology Master of Science in Nanomaterial Engineering This work described the synthesis of silicon carbide nanowhiskers (SiCNWs) by using the microwave heating.. The main objective of this project is to study the feasibility of synthesis of SiCNWs from expanded graphite (EG) and silica using microwaves heating. Several parameters were studied such as the effect of ratio of graphite and silica, heating temperature, heating duration and types of graphite on the formation of SiCNWs in term of morphology, compositions, optical properties and purity. In this study, SiCNWs was synthesized by microwave heating mixture of EG and silica and the effect of processing parameters on the synthesis were studied. For effect of ratio of EG and silica, the mixture of EG and silica with the ratio 1:3 was found to be suitable for the synthesis of SiCNWs because the formation of high purity β-SiC nanowhiskers. Mixture of silica and EG with the ratios 1:5 and 1:7 had the traces of unreacted graphite. Study of effect of heating temperature revealed a temperature at 1400 ºC is suitable for the synthesis of SiCNWs. β-SiC appeared as the only phase in the XRD pattern of SiCNWs formed at 1400˚C. FESEM imaging confirmed the presence of only a negligible amount of graphite or silica in SiCNWs synthesized at 1400˚C. Meanwhile, PL spectrum indicated the presence of single phase β-SiC peak at 440 nm which is associated with band gap of 2.8 eV. Single absorption bands of Si-C bond were detected at 803.5 cm-1 in FTIR analysis. SiCNWs produced in this study at 1400˚C has good thermal stability with 6% of weight loss. Effect of heating duration was also studied and 40 minutes was found to be the most ideal heating duration for the synthesis of SiCNWs. β-SiC appeared as the only phase in the XRD pattern for SiCNWs formed by using 40 and 60 minutes of heating duration with no traces of unreacted silica and graphite. FESEM imaging confirmed that no trace of graphite or silica was present in SiCNWs synthesized at heating duration of 40 and 60 minutes. SiCNWs produced by heating at 40 and 60 minutes have high thermal stability with weight loss lower than 6%. It was found that SiC nanowhiskers (SiCNWs) were formed when EG was used as the starting material, while SiC nanoparticles (SiCNPs) were formed when FG was used. β-SiC appeared as the only phase in the x-ray diffraction pattern for SiCNMs formed by FG and EG. FESEM confirmed that no trace of graphite or silica was present in both SiCNWs and SiCNPs. Meanwhile, photoluminescence spectra show the presence of β-SiC peak at 440 nm and associated with band gap of 2.8 eV for both SiCNWs and SiCNPs. Absorption bands of Si-C bond were detected at 803.4 cm-1 for SiCNPs and 802.5 cm-1 for SiCNWs in the FTIR spectra. SiCNWs and SiCNPs have high thermal stability with weight loss less than 6 %. In conclusion, SiCNWs and SiCNPs have been successfully synthesized through the microwave heating of a mixture of silica/EG and silica/FG in an argon atmosphere. 2018 2022-11-08T02:44:20Z 2022-11-08T02:44:20Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/76729 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) Institute of Nano Electronic Engineering
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Silicon carbide
Silica
Silicon compounds
Microwave heating
Nanotechnology
spellingShingle Silicon carbide
Silica
Silicon compounds
Microwave heating
Nanotechnology
Suhaimi, Mat Kahar
Synthesis of silicone carbide nanowhiskers by microwave irradiation method
description Master of Science in Nanomaterial Engineering
author2 Voon, Chun Hong, Dr.
author_facet Voon, Chun Hong, Dr.
Suhaimi, Mat Kahar
format Thesis
author Suhaimi, Mat Kahar
author_sort Suhaimi, Mat Kahar
title Synthesis of silicone carbide nanowhiskers by microwave irradiation method
title_short Synthesis of silicone carbide nanowhiskers by microwave irradiation method
title_full Synthesis of silicone carbide nanowhiskers by microwave irradiation method
title_fullStr Synthesis of silicone carbide nanowhiskers by microwave irradiation method
title_full_unstemmed Synthesis of silicone carbide nanowhiskers by microwave irradiation method
title_sort synthesis of silicone carbide nanowhiskers by microwave irradiation method
publisher Universiti Malaysia Perlis (UniMAP)
publishDate 2018
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/76729
_version_ 1751537964223037440
score 13.222552

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