Faculty of Electronic Engineering & Technology

Faculty of Electronic Engineering & Technology

Parent Organisation

Universiti Malaysia Perlis

Country

MY

City

Pauh Putra, Perlis

Now showing 1 - 10 of 46

Remazol orange dye sensitized solar cell

( 2017-01-03)
Siti Salwa Mat Isa
;
Muhammad Mahyiddin Ramli
;
Nor Azura Malini Ahmad Hambali
;
Muda M.R.
;
Shahrir Rizal Kasjoo
;
Muammar Mohamad Isa
;
Nurul Izza Mohd Nor
;
Norhawati Ahmad
;
Nazuhusna Khalid
;
Nur M. Selamat
;
Nur Asyikin Mohd Anhar

Water based Remazol Orange was utilized as the dye sensitizer for dye sensitized solar cell. The annealing temperature of TiO2 working electrode was set at 450 °C. The performance of the device was investigated between dye concentrations of 0.25 mM and 2.5 mM at three different immersion times (3, 12 and 24 hours). The adsorption peak of the dye sensitizer was evaluated using UV-Vis-Nir and the device performance was tested using solar cell simulator. The results show that the performance was increased at higher dye concentration and longer immersion time. The best device performance was obtained at 0.2% for dye concentration of 2.5 mM immersed at 24 hours.
Effect of sodium ion addition on copper selenide/chitosan film towards electrical and shielding efficiency improvement

( 2024-06)
Nurul Najiha Mazu
;
Hazeem Ikhwan Mazlan
;
Josephine Ying Chyi Liew
;
Nurul Huda Osman
;
Muhammad Mahyiddin Ramli
;
Ali Reshak

The operation of electronic devices can be disrupted by unwanted electromagnetic signals, affecting its operation. Deploying electromagnetic shielding is a viable solution to minimize the impact of electromagnetic interference (EMI). The conventional methods of electromagnetic shielding use metal gaskets to safeguard sensitive electronic components, which have drawbacks of cost and weight. Hence, electromagnetic shielding polymer can be an alternative to replace metal gaskets. This work investigates the effect of sodium ion (Na) addition to copper selenide/chitosan (CuSe/Ch) film for electromagnetic shielding applications. The shielding polymers were produced using solution casting methods, while the CuSe was synthesized using the chemical coprecipitation method. Impedance spectroscopy and two port waveguide methods were used to characterize the prepared polymer's electrical properties and shielding efficiency. The results indicate that Na incorporation in the CuSe/Ch film resulted in a 47 % decrease in bulk resistivity and increased DC conductivity from 6.07 × 10-6 S/cm to 3.69 × 10˗5 S/cm. The AC conductivity of films containing Na demonstrates a similar level of conductivity at lower frequencies, followed by a sharp increase at higher frequencies, indicating a more substantial influence of Na at higher frequencies. Higher absorption shielding efficiency (SEA) and lower reflection shielding efficiency (SER) were achieved by introducing Na into the CuSe chitosan film. The Na/CuSe/Ch film shows higher total shielding efficiency at an average of 20 dB, equivalent to 99 % of the EM power shield.
Single wall carbon nanotubes dispersion study of different dye molecules and chitosan

( 2017-09-26)
Muhammad Mahyiddin Ramli
;
Siti Salwa Mat Isa
;
Mohd. Mustafa Al Bakri Abdullah
;
Sohiful Anuar Zainol Murad

Carbon Nanotubes (CNTs) is known for their hydrophobicity ability. However, this ability can become the bottleneck for the application of CNTs where a highly dispersion of materials are needed. In this project, different dispersing agents were investigated namely dye molecules and chitosan. Three different dyes are studied with different concentration, including 0.05 % of chitosan. The dispersion quality is determined by examining through UV-Vis-NIR. The best dispersion quality investigated here is when the concentration of dye molecules is higher, which is around 2.5 mM.
Effect of soaking time towards graphitization of empty fruit bunch (EFB) waste

(AIP Publishing, 2023)
Norizah Abd Karim
;
Che Mohd Ruzaidi Ghazali
;
Muhammad Mahyiddin Ramli
;
Marniati
;
Zulfadhli, M. R.M.
;
Mutiawati

Empty fruit bunch (EFB) are the second-highest waste produced in the oil palm industry which is 18 022 tonnes in a year. However, the presence of oil palm waste especially from empty fruit bunch (EFB) give a major problem to the disposal. Herein, EFB waste has been identified as a potential carbon source for synthetic graphite production. This is due to implement the lower heating temperature of synthetic graphite produced in controlled heating conditions. Several parameters have been manipulated to study the effect of various parameters on the graphitization process. Hence, in this study, the effect of soaking time towards graphitization of empty fruit bunch (EFB) waste has been investigated. EFB waste was heat treated with various soaking times which is 2 hours, 2.5 hours and 3 hours in controlled heating conditions with constant heating temperature at 500°C and heating rate at 10°/minute After heating treatment, the samples were characterized using X-ray Diffraction (XRD) and analyzed by X'Pert Highscore Plus software. The functional group of synthetic graphite was determined by using Fourier Transform Infrared spectroscopy (FTIR). The morphological study was carried out by using Scanning Electron Microscope (SEM). From the analysis, the best synthetic graphite produced is at the 2.5 hours soaking time with a constant heating temperature at 500°C and a constant heating rate at 10°/min.
Characterization of doped ZnO thin film for Ammonia gas sensing application

(Institute of Physics, Polish Academy of Sciences, 2023)
Shazlina Johari
;
Fatin Amira Hasbullah
;
Anis Syafiqa Rosman
;
Muhammad Mahyiddin Ramli
;
Mohd Fairus Ahmad
;
Norizah Abd Karim
;
Nurul Huda Osman
;
D. Darminto
;
Ali Hussain Reshak
;
Sebastian Garus

This paper reports on the characterization of Sn- and Al-doped zinc oxide thin film for potential ammonia gas detection. The sol–gel method has been used to deposit the dopant onto the glass substrate at an annealing temperature of 500◦C for three different doping concentrations, which are 0.5, 1.0, and 1.5 at.%. The method used to produce this thin film is sol–gel, as it is cheap, easy, and can be employed at low temperatures. The studies involve the investigation of the morphological structures and electrical and optical properties of doped ZnO. In terms of structural properties, scanning electron microscope images of Sn- and Al-doped ZnO change as the dopant concentration is increased. The doped thin film response and recovery towards 200 ppm of ammonia were observed and recorded. Both dopants show good gas sensing response. The recorded resistance reading suggests that Al is the superior dopant in gas sensing as it produces a low resistance reading of 230 Ω as opposed to 140 kΩ produced by Sn-doped ZnO thin film.
Optimization of soaking time for graphitization of oil palm trunk waste

(AIP Publishing, 2023)
Norizah Abd Karim
;
Muhammad Mahyiddin Ramli
;
Che Mohd Ruzaidi Ghazali
;
H. S. S. A. Syed
;
R. M. S. Syah

Synthetic graphite was synthesized from oil palm trunk chip in controlled heating condition or pyrolysis process. The soaking time was varied in the range of 2.5 hours, 3 hours, and 3.5 hours. While the heating rate and heating temperature was constant at 20 °/min and 500°C accordingly. After heat treatment process, the samples were characterized by X-Ray Diffraction (XRD) and analyzed using X'Pert Highscore Plus software. Synthetic graphite phase was analyzed by XRD and it was further supported by Fourier Transform Infrared (FTIR) Spectroscopy analysis to verify existence of functional group. The morphological study was carried out by using Scanning Electron Microscope (SEM). Based on the analysis, it was confirmed that synthetic graphite was successfully synthesized at 3hours soaking time with 500 °C and 20 °/min heating rate. Synthetic graphite was observed in the form of amorphous carbon based on the XRD diffraction pattern that match with the reference code of 00-041-1487.

24 2
Influence of perturbations on linear and nonlinear optical properties of quantum dot

(Springer, 2023)
Collins Okon Edet
;
Emre Bahadir Al
;
Fatih Ungan
;
Etido Patrick Inyang
;
Norshamsuri Ali @ Hasim
;
Muhammad Mahyiddin Ramli
;
Rosdisham Endut
;
Syed Alwee Aljunid Syed Junid

This study focused on investigating the influence of perturbations on the linear and nonlinear optical properties of GaAs/ Ga1-xAlxAs screened modified Kratzer potential (SMKP) quantum dot (QD). The optical absorption coefficients (OACs) and refractive index changes (RICs) for GaAs/ Ga1-xAlxAs have been presented. The density matrix and iterative approaches were used to derive expressions of OACs and RICs in SMKP QD. The diagonalization method has been used to obtain energy eigenvalues and eigenfunctions of GaAs/ Ga1-xAlxAs SMKP QD under the effects of Al concentration-x, hydrostatic pressure, and temperature. Our results reveal that the Al concentration-x, hydrostatic pressure, and temperature greatly impact the position and amplitude of the resonant peaks of the linear and nonlinear OACs and RICs. Interpretations have been presented in detail. The results of this study will find applications in the optical physics of semiconductors and other systems.

1 14
Physical, mechanical and electrical properties of Chitosan/Graphene Oxide composite films for Copper Ions (Cu²+) detection

(Springer, 2023)
Mohammad Abdull Halim Mohd Abdull Majid
;
Nurul Huda Osman
;
Nizam Tamchek
;
Nurul Asyikin Ahmad Sukri
;
Hazeem Ikhwan Mazlan
;
Nurul Najiha Mazu
;
Adilah Idris
;
Josephine Ying Chyi Liew
;
Muhammad Mahyiddin Ramli

Copper ions are one of the metal ions that contribute significantly to water pollution and threaten the ecosystem. The threat heightened the importance of the detection and removal of the contaminants. In this study, the Chitosan/Graphene Oxide (CH/GO) composite film was synthesized at different GO ratios via a direct casting technique. The structural, mechanical and film adsorption capacities were characterized along with the electrical properties. The results revealed that adding GO into CH at a 1:5 ratio produces the highest strength and adsorption capacity. The 1:5 film was then tested for its electrical properties to see the possibility of utilizing it as part of an electrical measurement system. Various electrical parameters such as permittivity (ε′, ε″), Tanδ, bulk resistivity (Rb) and DC conductivity (σDC) were studied. Results show that the 1:5 ratio chitosan film in various Cu²+ concentrations yielded significant differences in electrical properties. The Rb and σDC gave the most significant results and can be used as Cu²+ detection parameters.

2 20
Review—Charge carrier mobility of organic thin film transistor: intrinsic and extrinsic influencing factors based on organic semiconducting materials

(IOP Publishing, 2023)
Nur Zuraihan Abd Wahab
;
Abdullah Abdulhameed
;
Ahmad Ghadafi Ismail
;
Muhammad Mahyiddin Ramli
;
Roslina Mohd Sidek
;
Suhaidi Shafie
;
Mohd Nazim Mohtar

The use of organic thin film transistors (OTFTs) is growing rapidly as an alternative to their inorganic counterparts due to their advantageous properties, such as easy processing and flexibility. The performance of OTFTs is still undergoing improvement and taking this as a recognition, this paper reviews various factors that influence the performance of the OTFTs, primarily in terms of field-effect mobility. The influencing factors reviewed in this article are divided into intrinsic and extrinsic factors for different organic semiconducting materials (OSMs). The intrinsic factors include the OSMs’ molecular orientation, OSM/dielectric interaction, and OSM/electrode interaction. The extrinsic factors are basically related to the OSM processing and OTFTs fabrication. For example, the article discusses how mixing, blending, and annealing affect the properties of the OSMs. The effect of the ambient atmosphere on OTFTs’ performance is also discussed. The aim of this article is to discuss the current trends related to one of the critical figures of merit of OTFTs, which is the mobility of charge carriers.

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Mesoporous Structure of Doped and Undoped PEG on Ag/TiO2 Thin Film

( 2019-08-14)
Abdul Razak K.
;
Dewi Suriyani Che Halin
;
Azani A.
;
Mohd. Mustafa Al Bakri Abdullah
;
Mohd Arif Anuar Mohd Salleh
;
Norsuria Mahmed
;
Muhammad Mahyiddin Ramli
;
Sepeai S.

In this reaserch, photocatalyst silver titanium dioxide was doped and modified by Polyethylene Glycol (PEG). The purpose of the present study was to analyse the synthesized Ag/TiO2 thin film doped and undoped PEG. Ag/TiO2 thin films on silicon wafer have been prepared by sol-gel spin coating. The samples were characterized by Grazing Incidence X-ray diffraction (GIXRD), Field Emission Scanning Electron Microscopy (FESEM) and Atomic Force Microscope (AFM). The doped and undoped PEG Ag/TiO2 thin films showed a mesoporous TiO2 matrix which includes TiO2 crystallites of 10-20 nm in size and small Ag nanoparticles (white spots) with various sizes ranging from 10 to 30 nm. However, doped PEG Ag/TiO2 thin film showed the Ag nanoparticles became agglomerates but still remained roughly uniform on the surface.

34 4

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