Uda Hashim
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Preferred name
Uda Hashim
Official Name
Uda, Hashim
Alternative Name
Hashimb, U.
Hashim, Uda
Hashim, U.
Uda, Hashim
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Scopus Author ID
22633937800
Researcher ID
CVC-6955-2022

Research Output

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  • Publication
    Fabrication of Integrated Electrode for pH Sensor Application
    ( 2021-01-01)
    Mohd Akhir F.S.
    ;
    Foo Kai Loong
    ;
    Jin T.S.
    ;
    Uda Hashim
    ;
    Voon Chun Hong
    ;
    Azman Abu Hassan M.
    Integrated Electrode (IDEs), as a sensor, is a pervasive device in modern electronics and future hopes for producing a highly sensitive and selective sensor. In this work, a simple method of conventional photolithography for the fabrication of interdigitated electrodes is presented in detail. The structural of highly uniform IDEs device was optically characterized using high power microscope (HPM) and scanning electron microscope (SEM). Besides, the fabricated IDEs device was undergone electrical measurement with different pH. The result shows the highest current at 96 nA when the IDEs was tested with pH 10. Overall, our study establishes a correlation between structural and electrical properties of Al IDEs thin films with different pH
  • Publication
    Study on the effects of anodizing voltage to the AAO thin film dimensional properties synthesized by single step anodization method
    ( 2021-05-03)
    Shahidah Arina Shamsuddin
    ;
    Mohd Nazree Derman
    ;
    Uda Hashim
    ;
    Muhammad Faheem Mohd. Tahir
    Anodic aluminium oxide (AAO) thin film electrodes were synthesized by using a single step anodizing method in 15 °C of 0.3 M oxalic acid at five different anodizing voltage ranging from 20 V to 60 V, respectively. The effect of anodizing voltage to the AAO dimensional properties were about to be investigated. Morphological observations were all done by FESEM where the measurements and calculation were made by using ImageJ and formulas. To ensure that the pore sizes were totally depended on the anodizing voltage, etching process were done at constant duration for all samples. The correlation between all AAO dimensional properties like pores size, interpore distance, wall thickness, pore density, percentage of porosity and nanoporous oxide thickness were presented in a linear graph.
  • Publication
    From nanostructure to nano biosensor: Institute of Nano Electronic Engineering (INEE), UniMAP experience
    ( 2011)
    Uda Hashim
    ;
    Foo Kai Loong
    Nanostructure is defined as something that has a physical dimension smaller than 100 nanometers, ranging from clusters and/or to dimensional layers of atoms. There are three most important nanostructures that are extensively studied and researched in various organizations including Institute of Nano Electronic Engineering (INEE) in UniMAP. These include quantum dot, nanowire, and nanogap, which have been successfully designed and fabricated using in-house facilities available. These are subsequently used as a main sensing component in nanostructures based biosensor. This fabrication, characterization and testing job were done within four main interlinked laboratories namely microfabrication cleanroom, nanofabrication cleanroom, failure analysis laboratory and nano biochip laboratory. Currently, development of Nano Biosensor is the main research focus in INEE. In principle, biosensor is an analytical device which converts a biological response into an electrical signal.
  • Publication
    Label-free aptamer based biosensor for heavy metal detection
    ( 2020-11-02)
    Muhammad Nur Aiman Uda
    ;
    Uda Hashim
    ;
    Subash Chandra Bose Gopinath
    ;
    Muhammad Nur Afnan Uda
    ;
    Nor Azizah Parmin
    ;
    Isa A.M.
    Heavy metal contamination such as arsenic becomes serious threat to the health and environment of many millions in a worldwide. Arsenic contamination especially in paddy field has driven to the accumulation of As in paddy soils and possibly have adverse effects on rice products. To assess the level of severity of arsenic in paddy field is a major constraint at early stages. In the past, quantification of concentration of arsenic has been as difficult as reducing it. Thus label free Aptamer based biosensor is the most reliable sensor recently due to the advantages for the sensitive and selective detection towards detecting arsenic. Finally, this paper will discuss the current outcomes in arsenic detection using Aptasensor with sensing element formatting in enhancing the sensor signal for detection.
  • Publication
    Development of Voltage Amplifier Electronic Reader for Multiplex Detection of Two Electrode Electrical Biosensors
    ( 2020-03-18)
    Muhammad Nur Afnan Uda
    ;
    Asral Bahari Jambek
    ;
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    Amperometric electrical biosensors have small current variations at nano to micro range. There are limited number of electrical based two electrode electronic readers for biosensors are commercial available because of the amplification and noise issues at nano to micro ampere current range. The electronic reader focused on design a voltage amplifier circuit to capture and amplify three different range of current as nano, micro and mili ampere and convert it to detectable voltage range as an output voltage signal. Current input as nano, micro and mili current were flown through 10 K , 10 and 10 m resistors, respectively to convert different current inputs to the similar range in micro voltage. Then, MAX 4238 op-amp IC was used to amplify micro voltage to mili voltage. Arduino Uno circuit was act as the process and control circuit to read the output voltage from the amplifier circuit. Arduino Uno circuit will convert analog signal to digital signal and then the output voltage value is display in the LCD screen. The Proteus 8 Pro software was used to design, simulate and calibrate the amplifier circuit and Arduino Uno circuit. While, Arduino software was used to create a programming code and to upload in Arduino Uno circuit. Start your abstract here.
  • Publication
    Titanium dioxide (TiO2) nanoparticles on aluminium interdigitated electrodes (Al IDE) for sensitive pH detection
    ( 2020-11-02)
    Uda M.N.A.
    ;
    Asral Bahari Jambek
    ;
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    Titanium dioxide (TiO2) nanoparticles based Aluminium Interdigitated Electrode (Al IDE) was tested as pH electrodes and measured quantitatively. TiO2 nanoparticle was synthesized using sol-gel method with monoethanolamine (MEA) as a catalyst. The mixing of titanium butoxide as a precursor, ethanol as a solvent and MEA as stabilizer were stirred using magnetic stirrer under ambient temperature. Al IDE were fabricated by conventional photolithography method. TiO2 solution prepared then was deposited on Al IDE using spin-coater and the coated device were annealed at 400°C. Deposition of TiO2 solution on the fabricated Al IDE forms a sensor that promising for development of TiO2 nanoparticle based biosensors. The surface morphologies structural properties were studied using Scanning Electron Microscopy (SEM). The small amount of current measurement of this device towards hydrogen and hydroxide ions was measured by Keithley 2450 pico ammeter.
  • Publication
    Nano-micro-mili Current to Mili Voltage Amplifier for Amperometric Electrical Biosensors
    ( 2020-03-18)
    Muhammad Nur Afnan Uda
    ;
    Parmin N.A.
    ;
    Asral Bahari Jambek
    ;
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    ;
    Shaharuddin S.N.A.
    ;
    Adam H.
    Amplification of nano and mircoampere electrical signal to the detectable range is essential in the biosensor field. This research is mainly focused on design an amplifier circuit to capture and amplify three different range of current as nano, micro and mili ampere and convert it to detectable voltage range as an output signal to the processing circuit. The Proteus 8 Pro software was used to design, simulate and calibrate the amplifier circuit. Firstly, current input as mili, micro and nano current were flown through 0.1 m, 10 and 10 K resistors, respectively to convert different current inputs to the similar range in micro voltage. The MAX 4238 opamp IC was used to amplify micro voltage to mili voltage. LM 358 dual operational amplifier was used to supply virtual ground to MAX 4238 amplifier. The amplified output voltage of three different current inputs as nano, micro and mili were nearly equal to theoretical outputs.
  • Publication
    A gold nanoparticles coated unclad single mode fiber-optic sensor based on localized surface plasmon resonance
    ( 2023-12-01)
    Fakhri M.A.
    ;
    Salim E.T.
    ;
    Tariq S.M.
    ;
    Ibrahim R.K.
    ;
    Alsultany F.H.
    ;
    Alwahib A.A.
    ;
    Alhasan S.F.H.
    ;
    Subash Chandra Bose Gopinath
    ;
    Salim Z.T.
    ;
    Uda Hashim
    In the last few decays, the fiber-optic was employed in the field of sensing because of its benefits in contrast to other types of sensors such as small size, easy to fabricate, high response, and flexibility. In this study, unclad single mode fiber-optic sensor is proposed to operate at 650 nm wavelength. COMSOL Multiphysics 5.1 finite element method (FEM) is used to design the sensor and tested it theoretically. The middle portion of the fiber cladding is removed and replaced by gold nanoparticles (Au NPs) of 50 nm thickness. Analytic layer of 3 Î¼m thickness was immersed in different liquids in range of refractive index (RI) from 1.000281 to 1.39. These liquids are NaCl Deionized (DI) water solution, sucrose-Deionized (DI) water solution, and glycerol solution Deionized (DI) water. It was found that the highest obtained sensitivity and resolution are for glycerol-DI water solution with value of 3157.98 (nm/RIU) and 3.16 × 10–5 (RIU), respectively. Furthermore, it is easy to fabricate and of low cost. In experiments, pulsed laser ablation (PLA) was used to prepare Au NPs. X-ray diffraction (XRD) shown that the peak of the intensity grew as the ablated energy increased as well as the structure crystallization. Transmission electron microscopy (TEM) revealed an average diameter of 30 nm at the three ablated energies, while X-ray spectroscopy (EDX) spectrum has indicated the presence of Au NPs in the prepared solution. The photoluminescence (PL) and ultraviolet–visible UV–Vis transmission were used to study the optical properties of the prepared Au NPs. An optical spectrum analyzer was used to obtain the sensor's output results. It has shown that best intensity was obtained for sucrose which confined with theoretical results.
  • Publication
    Characterization of Zinc Oxide (ZnO) piezoelectric properties for Surface Acoustic Wave (SAW) device
    ( 2017)
    Mohd Rosydi Zakaria
    ;
    Shazlina Johari
    ;
    Mohd Hafiz Ismail
    ;
    Uda Hashim
    In fabricating Surface Acoustic Wave (SAW) biosensors device, the substrate is one of important factors that affected to performance device. there are many types of piezoelectric substrate in the markets and the cheapest is zinc Oxide substrate. Zinc Oxide (ZnO) with its unique properties can be used as piezoelectric substrate along with SAW devices for detection of DNA in this research. In this project, ZnO thin film is deposited onto silicon oxide substrate using electron beam evaporation (E-beam) and Sol-Gel technique. Different material structure is used to compare the roughness and best piezoelectric substrate of ZnO thin film. Two different structures of ZnO target which are pellet and granular are used for e-beam deposition and one sol-gel liquid were synthesize and compared. Parameter for thickness of ZnO e-beam deposition is fixed to a 0.1kÅ for both materials structure and sol-gel was coat using spin coat technique. After the process is done, samples are annealed at temperature of 500°C for 2 hours. The structural properties of effect of post annealing using different material structure of ZnO are studied using Atomic Force Microscopic (AFM) for surface morphology and X-ray Diffraction (XRD) for phase structure.
  • Publication
    Comparative analysis on aluminium interdigitated electrode surface influence of ionic strength and electrolytes changes
    ( 2024-06)
    Hussaini Adam
    ;
    Subash Chandra Bose Gopinath
    ;
    Tijjani Adam
    ;
    Makram A. Fakhri
    ;
    Evan T. Salim
    ;
    Uda Hashim
    The field of generating surface thin films in sensing applications is emerging, and the incorporation of thin film technology into sensor development for enhanced sensing is becoming increasingly significant in various industries such as healthcare, environmental monitoring, and food safety. However, in order to achieve higher specificity in biosensing, advances in nanomaterial biofunctionalization are crucial. This research focuses on the fabrication and characterization of nanobiosensors with surface modification using two different sensing materials: zinc oxide and gold nanorod nanocomposites. The aim of this study was to enhance the sensing capabilities of nanobiosensors by incorporating surface modification with different sensing materials. The fabrication of nanobiosensors involved using silicon as the base material and conventional photolithography to fabricate aluminium interdigitated electrodes with three different structures and gap sizes. AutoCAD software was utilized to create three different photo masks with varying gap sizes. Physical characterization of the fabricated ALIDEs was conducted using atomic force microscope, high power microscope, scanning electron microscope, and 3D-profilormeter. The electrical characterization of the ALIDEs was performed using a Keithley 6487 picoammeter. I-V measurements were conducted on bare ALIDEs as well as surface modified ALIDEs with zinc oxide and gold nanorod. I-V measurements were also performed for pH scouting. The I-V measurements on bare ALIDEs revealed that ALIDEs modified with gold nanorod conducted the least current compared to ALIDEs modified with zinc oxide. Furthermore, the ALIDEs modified with gold nanorod were found to be stable under various electrolytes environments after undergoing pH scouting.