Syarifah Norfaezah Sabki
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Preferred name
Syarifah Norfaezah Sabki
Official Name
Syarifah Norfaezah, Sabki
Alternative Name
Sabki, S. N.
Sabki, Syarifah N
Norfaezah Sabki, S
Sabki, Syarifah Norfaezah Binti
Main Affiliation
Scopus Author ID
35090423100
Researcher ID
GBY-6284-2022

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Progression in the growth of cylindric nanostructures: carbon nanotubes (CNTs) and carbon nanofibers (CNFs) on graphene

2022-12 , Syarifah Norfaezah Sabki , Norzilah Abdul Halif , H.A. Hanafi , Mishthafiyatillah , Muhammad Asri Idris , Norashiken Othman , Mohamad Nazri Abdul Halif , Norhayati Sabani , A.F. Abd Rahim

The combination of carbon nanotubes (CNTs) and graphene produce a CNTs-graphene hybrid material with excellent electrical and mechanical properties that improved from their single form. This CNTs-graphene hybrid material has the potential to be used as electrodes and interconnects as it has better properties compared to copper (Cu). This work intended to grow CNTs on graphene using a CVD technique. The growth process used graphene on a Cu substrate with ferrocene as the catalyst, acetone as the carbon precursor and reactor temperature of 800oC. However, the process has unintentionally grown carbon nanofibers (CNFs). To observe the progression in the growth of CNTs and CNFs on graphene, the effect of growth reaction time is crucial. Hence, this work investigates the growth progression of the CNTs and CNFs on graphene based on different reaction times of 10 min, 20 min, 30 min and 60 min. It was found that the agglomeration of carbon is incomplete at 10 min reaction time and produced cylindric nanostructures. A further reaction time of 20 min and 30 min has significantly changed the size of the cylindric nanostructures into CNTs and CNFs with a very slight difference in the size, density, and coverage. The 30 min reaction time produced denser CNTs and CNFs with more uniform size and coverages. A longer reaction time of 60 min led to very long CNFs with an average length of 120 μm. In conclusion, meticulous fine-tuning of the reaction time is required to control the formation of CNTs and CNFs on graphene.

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Correlation between crystal structure and thermal reaction of TiOâ‚‚ - Graphene Oxide

2021-04 , Siti Kartom Kamarudin , Muhammad Asri Idris , Nur Farhana Diyana Mohd Yunos , Banjuraizah Johar , Ho Li Ngee , Syarifah Norfaezah Sabki , Suhaimi Illias

TiO₂ - Graphene oxide (GO) (GO = 0-1.0wt %) powders were synthesised using sol-gel method and annealed at 500°C. The samples were then characterised using X-ray diffraction (XRD). The additional of GO gave significant influence on the crystal structure of TiO₂. The lattice parameter of TiO₂ were increased with decreasing GO concentration. The unit cell volume of TiO₂-GO annealed in N2 decreased with the oxygen occupancy. In contrary, the TiO₂-GO annealed in O₂ has an increase in O₂ occupancies in the lattice that was nearly proportional to its unit cell volume. A continuous weight loss was recorded by TGA at a temperature range of T= 30 - 1000°C that were associated with H2O, C-H and C-O species. It is concluded that the Ti-O-C and Ti-C bonds were formed for samples annealed in O₂ and N2 respectively. The weight loss of TiO₂-GO annealed in O₂ is lesser than that annealed in N2 for same concentration additional GO into TiO₂.

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A review: synthesis and mechanism of growth of the carbon nanotubes (CNTs) – graphene hybrid material and its application as electrodes

2023-07 , Mishthafiyatillah , Syarifah Norfaezah Sabki , Norzilah Abdul Halif , Muhammad Asri Idris , Norashiken Othman

The CNTs–graphene hybrids have many advantages and potential for use in a wide range of electronic applications as electrodes. The CNTs–graphene hybrid structure outperforms the structure of each material in terms of characteristics and performance. There are several methods to grow CNTs. This paper reviews the chemical vapor deposition (CVD) method used to synthesize CNTs–graphene hybrid material. This paper discusses the processes and growth parameters of the synthesis of the CNTs-graphene hybrid. This paper also discusses the growth mechanism and kinetics of CNTs. In addition, the potential and performance of CNTs–Graphene hybrid material as electrodes in batteries are also reviewed.

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A controlled growth of carbon nanofibers (CNFs) on graphene

2023-12 , Mishtha Fiyatillah , Syarifah Norfaezah Sabki , Norzilah Abdul Halif , L K Wisnu Kita , Muhammad Asri Idris , Noraini Othman , A F Abd Rahim

Carbon nanofibers (CNFs) have superior properties such as high conductivity, good mechanical strength, high specific surface area, and chemical stability. CNFs-graphene hybrid material can be used as a high-quality electrode in electronics applications. In the CNFs on graphene synthesis, the growth parameters must be well controlled. This work observes the evolution of the CNF's growth on graphene on Ni at reaction temperatures of 800oC and 860oC and at different reaction times of 30 min, 60 min, and 120 min. This research aims to find suitable conditions for obtaining controllable growth of CNFs on graphene. Based on the SEM measurement, it was found that the 860oC reaction temperature at 60 min and 120 min reaction time led to longer and smaller widths of CNFs with high coverage and distribution on graphene. The CNFs on graphene formation were confirmed by the XRD analysis.

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Nanoparticle-based biosensors for detection of heavy metal ions

2023-10 , Y. J. Beh , Mohammad Nuzaihan Md Nor , Syarifah Norfaezah Sabki , S. B. Chia , C. H. Ng , C. C Ong , Mohamad Faris Mohamad Fathil , Zarimawaty Zailan

Heavy metal pollution is one of the most serious environmental problems in the world. Many efforts have been made to develop biosensors for monitoring heavy metals in the environment. Development of nanoparticle-based biosensors is the most effective way to solve this problem. This review presents the latest technology of nanoparticle-based biosensors for environment monitoring to detect heavy metal ions, which are magnetic chitosan biosensor, colorimetric biosensor, and electrochemical biosensor. Magnetic chitosan biosensor acts as a nano-absorbent, which can easily detect and extract poisonous heavy metal ions such as lead ions and copper ions. There are several methods to prepare the chitosan based on the nanoparticle, which are cross-linking, co-precipitation, multi-cyanoguanidine, and covalent binding method. In colorimetric biosensor, gold and silver nanoparticles are commonly used to detect the lead and mercury ions. In addition, this biosensor is very sensitive, fast and selective to detect metal ions based on the color change of the solution mixture. Meanwhile, electrochemical biosensor is widely used to detect heavy metal ions due to a simple and rapid process, easy, convenient and inexpensive. This biosensor is focused on the surface area, which leads to significant improvement in the performance of devices in terms of sensitivity. The wide surface area can affect the performance of the biosensor due to a limited space for operation of electrode. Therefore, reduced graphene oxide is a suitable material for making the electrochemical biosensor due to a wide surface area, good conductivity and high mechanical strength. In conclusion, these three technologies have their own advantages in making a very useful biosensor in the detection of heavy metal ions.

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Impact of nanowire radius and channel thickness with high-k gate dielectric in GAA-JLT

2023-12 , Nilaventhiran Vespanathan , Noraini Othman , Syarifah Norfaezah Sabki , Alhan Farhanah Abd Rahim

As the transistor’s size becomes smaller, degradation in the short-channel effects (SCEs) becomes more apparent. This leads to research work on multi-gate transistors such as the Fin-Field Effect Transistor (FinFET) and Gate-All-Around (GAA) transistor, where the 3D architecture have been shown to have superior performance as compared to conventional planar transistor. Transistor without junctions (JLT) which realizes a single type of doping has also been gaining popularity for biosensor applications due to its superior electrostatic performances in terms of Drain-Induced Barrier Lowering (DIBL), off-state leakage current (Ioff) and Subthreshold Slope (SS). In this work, the impact of changes in parameters such as the gate oxide material, nanowire radius and channel thickness toward the performance of a Gate-all-around JLT (GAA-JLT) have been studied using TCAD simulator. It was found that smaller nanowire radius and thicker channel produces lower DIBL, Ioff and SS, with the use of HfO2 as gate oxide materials shows better results than Si3N4. Meanwhile, the impact of parameters variations seemed to be negligible on the on-state current (Ion). The outcome of this work can be used as a basis to understand the impact of structural parameters variations towards the performance of a more complex GAA-JLT structure.

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