Lim Bee Ying
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Preferred name
Lim Bee Ying
Official Name
Lim, Bee Ying
Alternative Name
Lim, B. Y.
Lim, Bee Y.
Main Affiliation
Scopus Author ID
57209532691
Researcher ID
DVB-1384-2022

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Dielectric properties and microwave absorbing properties of silicon carbide nanoparticles and silicon carbide nanowhiskers

2023-04 , Phey Yee Foong , Voon Chun Hong , Lim Bee Ying , Teh Pei Leng , Mohd Afendi Rojan , Subash Chandra Bose Gopinath , Nor Azizah Parmin , Mohd Khairuddin Md Arshad , Yeng Seng Lee , Ruslinda A. Rahim , Uda Hashim

Silicon carbide (SiC) is well known for their outstanding microwave absorbing properties. SiC nanomaterials (SiCNMs) are expected to have better microwave absorption performance due to their high specific surface area. To date, no study was reported to compare the dielectric properties and microwave absorbing properties of different type of SiCNMs. Therefore, the objective of this paper is to compare the dielectric properties and microwave absorption properties of different types of SiCNMs. In this paper, SiC nanoparticles (SiCNPs) and SiC nanowhiskers (SiCNWs) were characterised using SEM and XRD. In addition, their dielectric properties and microwave absorbing properties were measured using network analyser and transmission line theory. It was found that SiCNWs achieved higher dielectric constant and loss factor which are and εr’ =17.94 and εr″ = 2.64 compared to SiCNPs that only achieved εr’ = 2.83 and εr″ = 0.71. For microwave absorbing properties, SiCNWs and SiCNPs attained minimum reflection loss of -10.41 dB and -6.83 dB at 5.68 GHz and 17.68 GHz, respectively. The minimum reflection loss of SiCNPs and SiCNWs obtained in this study is much lower than the nanometer-SiC reported previously. These results suggested that SiCNWs can be an ideal candidate of microwave susceptors for various microwave applications

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The effect of graphite type on the synthesis of SiC nanomaterials by microwave-assisted synthesis

2020-09-01 , Mat Kahar Suhaimi , Voon Chun Hong , Lim Bee Ying , Al-Douri Y. , Subash Chandra Bose Gopinath , Ten S.T. , Mohd Khairuddin Md Arshad , Nor Azizah Parmin , Foo Kai Loong

SiC nanomaterial (SiCNM) is known for its excellent properties and has great potential for a wide range of applications. In this article, preparation of SiCNMs from different types of graphite was performed by microwave-assisted synthesis. Different types of graphite which are graphite flake (GF) and expanded graphite (EG) were used to react with silica for the synthesis of SiCNMs in laboratory microwave furnace at 1400 Â°C. It was found that SiC nanowhiskers (SiCNWs) were formed when EG was used, while irregular shaped SiC nanoparticles (SiCNPs) were formed when GF was used. β-SiC appeared as the only phase in the XRD patterns for both SiCNMs formed using GF and EG. SiCNWs and SiCNPs have interplanar spacing of around 0.25 nm which is the axial direction of [111]. The difference of formation mechanism is believed to be the origin of different morphology of SiCNMs synthesized from different types of graphite.

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