Zul Azhar Zahid Jamal
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Preferred name
Zul Azhar Zahid Jamal
Official Name
Zul Azhar, Zahid Jamal
Alternative Name
Jamal, Z. A. Z.
Jamal, Zul Azhar Zahid
Jamal, Z. A. Zahid
Jamal, ZA
Main Affiliation
Scopus Author ID
18935174100
Researcher ID
FCT-5153-2022

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  • Publication
    Cost effective negative Plenum Cleanroom for Microelectronic Engineering undergraduate
    ( 2005)
    Uda Hashim
    ;
    Zul Azhar Zahid Jamal
    ;
    Mohammad Nuzaihan Md Nor
    ;
    Nur Hamidah Abdul Halim
    he Negative Plenum Cleanroom which is design and built by KUKUM is primarily used for the teaching of the undergraduate microelectronic course. The cleanroom is approximately 115m² in size. The level of cleanliness in the cleanroom ranges from ISO Class 5 (Yellow Room) to ISO Class 8 (Grey Area/Utility Chase). The cleanroom is constructed with a negative plenum to house the fan filter units, which make it different from other commercially available cleanrooms. With negative plenum, maintenance work cost will be reduced and make the cleanroom life longer. The main intention of this project is to expose and teach students to appreciate the stringent cleanroom protocols, health and safety requirement in addition to the formal course works.
  • Publication
    Structural and electrical properties of Barium Titanate (BaTiO3) and Neodymium doped BaTiO3 (Ba0.995Nd0.005TiO3)
    ( 2017)
    Tuan Amirah Tuan Sulong
    ;
    Rozana Aina Maulat Osman
    ;
    Mohd Sobri Idris
    ;
    Zul Azhar Zahid Jamal
    Barium titanate (BaTiO3) and Neodymium (Nd) doped BaTiO3 with composition Ba0.995Nd0.005TiO3 were prepared using conventional solid state reaction method to study the dielectric properties of materials. Pure phase samples were found at final heating temperature of 1400°C for overnight. X-ray diffraction analysis reveals the changes in the lattice parameter and unit cell volume of the pure perovskite tetragonal structure with space group (P4mm). Electrical analysis is carried out to investigate the dielectric properties, conductivity behaviour and dielectric loss of BaTiO3 and Ba0.995Nd0.005TiO3. Ba0.995Nd0.005TiO3 have a broaden dielectric peaks with high permittivity of 8000 and reasonably low loss tan δ which is about 0.004 (1 kHz).
  • Publication
    Computational fluid dynamic (CFD) of air conditioning system for human thermal comfort analysis: A simulation study
    ( 2019-04-08)
    Ali A.M.
    ;
    Shazmin Aniza Abdul Shukor
    ;
    Rahim N.A.
    ;
    Zuradzman Mohamad Razlan
    ;
    Zul Azhar Zahid Jamal
    ;
    Kohlhof K.
    Human thermal comfort is very important especially in an indoor environment because it may effect human's health and welfare. Air conditioning (AC) system has become a necessary tool for indoors to maintain human comfort. This is especially applied to places with high strength of solar radiation, high relative humidity, high air temperature, and low air speed areas which are considered the most critical climate effect for indoors such as in Thailand, Malaysia, and Singapore. However, the current mechanism of the AC system allows the user to set it into maximum cooling, i.e. at the lowest temperature with highest fan speed. This setting does not necessarily create a thermally comfortable environment inside the room, but could contribute towards negative impact to human. Thus, there is a need to study the possibility of integrating the element of thermal comfort with the AC system. This project will concentrate on a case study of the effect of AC towards human thermal comfort in an indoor environment by using computational fluid dynamic (CFD) flow simulation. It adapts an enhanced Predicted Mean Vote (PMV)-based algorithm in creating the thermal comfort environment. The simulation uses SOLIDWORKS software and concentrates on a small sized room with one person doing sedentary work. The flow simulation is done on four conditions-maximum cooling setting and other three that is based on the enhanced PMV algorithm, which were then analyzed and compared. Based on the results, it is shown that the enhanced PMV-based algorithm could provide a thermally comfortable environment compared to the maximum cooling setting.
  • Publication
    Frequency Dependent Electrical Properties of Ferroelectric Ba0.8Sr0.2TiO3 Thin Film
    ( 1970)
    Ala’eddin A. SAIF
    ;
    Zul Azhar Zahid Jamal
    ;
    Zaliman Sauli
    ;
    Prabakaran A/L Poopalan
    The frequency dependent electrical parameters, such as impedance, electric modulus, dielectric constant and AC conductivity for ferroelectric Ba0.8Sr0.2TiO3 thin film have been investigated within the range of 1 Hz and 106 Hz at room temperature. Z* plane shows two regions corresponding to the bulk mechanism and the distribution of the grain boundaries-electrodes process. M" versus frequency plot reveals a relaxation peak, which is not observed in the ε″ plot and it has been found that this peak is a non-Debye-type. The frequency dependent conductivity plot shows three regions of conduction processes, i. e., a low-frequency region due to DC conduction, a mid-frequency region due to translational hopping motions and a high-frequency region due to localized hopping and/or reorientational motion.http://dx.doi.org/10.5755/j01.ms.17.2.490
  • Publication
    Dielectric and microstructural properties of BaTiO3 and Ba0.9925Er0.0075TiO3 ceramics
    ( 2017)
    Fatin Adila Ismail
    ;
    Rozana Aina Maulat Osman
    ;
    Mohd Sobri Idris
    ;
    Sanna Taking
    ;
    Zul Azhar Zahid Jamal
    BaTiO3 and Ba0.9925Er0.0075TiO3 ceramics were investigated regarding their dielectric and microstructure properties via conventional solid state reaction method. The phase pure samples were obtained when heated at 1400°C for overnight. The effect of Er3+ doped into BaTiO3 on dielectric properties and microstructural properties was investigated for composition of BaTiO3 and Ba0.9925Er0.0075TiO3. The analysis was made by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Impedance Analyzer. The XRD patterns of BaTiO3 and Ba0.9925Er0.0075TiO3 are phase pure and identical with tetragonal perovskite structure with space group of P4mm. The lattice parameters and unit cell volume of BaTiO3 increased by doping with Erbium as the crystallite size decreased. Measurements of dielectric properties were carried out as a function of temperature up to 200°C at different frequencies. Ba0.9925Er0.0075TiO3 exhibit the high value of dielectric constant (ε=6179) at Curie temperature (TC) of 120°C. SEM analysis of BaTiO3 and Ba0.9925Er0.0075TiO3 ceramics showed that the grain sizes of BaTiO3 and Ba0.9925Er0.0075TiO3 were ranged from 3.3µm-7.8µm and 2.2µm-4.7µm respectively.
  • Publication
    Fabrication of calcium phosphate coating on pure magnesium substrate via simple chemical conversion coating: surface properties and corrosion performance evaluations
    ( 2019)
    Mohd Amin Farhan Zaludin
    ;
    Zul Azhar Zahid Jamal
    ;
    Mohd Nazree Derman
    ;
    Mohd Zaheruddin Kasmuin
    The main objective of the current work was to fabricate calcium phosphate (CaP) coating on 99.9% purity magnesium, Mg substrate through simple chemical conversion method and evaluated the surface properties and corrosion performance of the coated substrates. The chemical conversion method was done by immersing the samples inside primary phosphating bath and followed by secondary treatment in alkaline solutions. The coated samples from the primary (PRI) and secondary (SEC) coating treatment were analyzed from morphological, topographical, and phase analysis aspects. The corrosion behaviour of the coatings inside simulated body fluid was assessed by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The PRI and SEC coated were composed of dicalcium phosphate dehydrate (DCPD) and hydroxyapatite (HA), respectively. Both of the coatings improved the corrosion resistance of the Mg substrate. The corrosion potentials, Ecorr of the coated samples becomes nobler compared to the bare substrates. EIS shows that the polarization resistance, Rp is improved about 40 and 2 times fold for PRI and SEC compared to the uncoated samples. Furthermore, PRI shows better corrosion resistance compared to SEC due to lower porosity along with thicker and better coating coverage.
  • Publication
    Correlation of film thickness to optical band gap of Sol-gel derived Ba0.9Gd0.1TiO3 thin films for optoelectronic applications
    ( 2017)
    Yen Chin Teh
    ;
    Ala’eddin A. Saif
    ;
    Zul Azhar Zahid Jamal
    ;
    Prabakaran A/L Poopalan
    Ba0.9Gd0.1TiO3 thin films have been fabricated on SiO2/Si and fused silica by sol-gel method. The films are prepared through a spin coating process and annealed at 900 °C to obtain crystallized films. The effect of film thickness on the microstructure and optical band gap has been investigated using X-ray diffractometer, atomic force microscope and ultraviolet-visible spectroscopy, respectively. XRD patterns confirm that the films crystallized with tetragonal phase perovskite structure. The films surface morphology is analysed through amplitude parameter analysis to find out that the grain size and surface roughness are increased with the increase of films thickness. The transmittance and absorbance spectra reveal that all films exhibit high absorption in UV region. The evaluated optical band gap is obtained in the range of 3.67 - 3.78 eV and is found to be decreased as the thickness increase.
  • Publication
    An Undergraduate Micro Fabrication Course at the Northern Malaysia University College of Engineering
    ( 2004)
    Uda Hashim
    ;
    Zul Azhar Zahid Jamal
    This paper presents the development of a new course conducted by the School of Microelectronic Engineering at the Northern Malaysia University College of Engineering or Kolej Universiti Kejuruteraan Utara Malaysia (KUKUM) in the area of microfabrication. Two related courses offered by the School are namely, semiconductor process technology and microelectronic fabrication. The course consists of a lecture and laboratory component. It is a new approach, as compared to the conventional undergraduate program, which is designed with 60% of the students' contact time, is dedicated to laboratory and workshop work, while the other 40% is for lectures. Therefore, a new 115m2 c/eanroom was developed and equipped with all basic tools that is necessary to fabricate and test microelectronic devices. The setup is mainly to expose the student with actual c/eanroom operation environment. The course content and the format of the courses are presented. The detailof the synopsis and the list of custom designed experiment for both courses are a/so provided. Such curriculum developed and offered by KUKUM is geared towards promoting the National Industrial Master Plan, especially in the semiconductor industry
      5  39
  • Publication
    Design and fabrication of quantum dot single electron transistor structure using e-beam nanolithography
    ( 2011-07)
    Uda Hashim
    ;
    S. Madnasri
    ;
    Zul Azhar Zahid Jamal
    Quantum dot single electron transistor (QD SET) is fabricated using e-beam nanolithography (EBL) and is continued with the combination process of pattern dependent oxidation (PADOX) and high density plasma etching. EBL was used to pattern the whole masks of SET fabrication which consist of mask for doped area separator and the rest are for the formation of: source-quantum dot-drain, poly-Si gate, point contact and metal pad respectively. All of these masks were designed using offline GDSII Editor Software and later been exposed by EBL integrated using the scanning electron microscopy (SEM). In this paper, the whole designs of SET masks which are successively patterned are demonstrated and their nanostructures characterizations using SEM and atomic force microscopy (AFM) are reported. We found that the shape and dimension biases of schematic and SEM images of masks were caused by proximity effect. Therefore, while designing the SET masks, proximity effect, used resist and EBL equipment resolution were considered.
      1  11
  • Publication
    Nano-silver microcavity enhanced UV GaN light emitter
    ( 2009)
    Ahmed, Naser Mahmoud
    ;
    Zaliman Sauli
    ;
    Uda Hashim
    ;
    Zul Azhar Zahid Jamal
    We report results of measurements that help to clarify the role of silver in the reflection of UV emission light from GaN. A GaN as an active layer was sandwiched between two silver metal reflectors. GaN layer on sapphire showed a photoluminescence (PL) peak around 364 nm and its full width half maximum was about 6.7 nm. Two types of microcavity, were fabricated: half-cavity GaN/sapphire/silver and full-cavity silver/ GaN/sapphire/silver. Photoluminescence measurements showed a two-fold intensity enhancement in half-cavity back mirror. In the full cavity samples, the amplitude of the photoluminescence is enhanced ten times when we used 50 nm silver as a front mirror. A tremendous more than 16-fold enhancement is obtained when silver mirror of 25 nm was used as a front mirror. The increase in the photoluminescence intensity is explained in terms of competition between increasing absorption in the cavity, silver surface plasmon coupling and increasing optical field-enhancement due to resonator.
      3  8