Mohd Nizar Hamidon

• PhD
• Managing Director at Universiti Putra Malaysia

Artificial flapping-wing robots necessitate a lightweight transmission mechanism with minimal interconnected parts, posing challenges to their development. This paper explores the design and analysis of a flapping actuation mechanism utilizing a crank and sliding lever configuration to convert rotational motion into angular flapping. The proposed m...

Perovskite solar cells represent a highly promising renewable energy technology due to their exceptional efficiency and cost-effectiveness. However, limitations exist in commonly used hole transport layers (HTLs) like Spiro-OMeTAD and PEDOT: PSS, which have their drawbacks. Nickel oxide (NiO) is a potential alternative HTL material but suffers from...

Carbon nanotube-Yttrium iron garnet (CNT-YIG) nanohybrid has been successfully synthesized using chemical vapor deposition (CVD) with yttrium iron garnet (YIG) nanopowders as catalyst, ethanol as carbon stock, and argon as carrier gas. Carbon nanotube (CNT) was observed to have grown from the YIG nanopowders with bamboo-like structures of CNT at a...

Dye-sensitized solar cells (DSSCs) are considered to be one of the promising photovoltaic devices in terms of low cost, low toxicity, and versatility. However, the issue of low power conversion efficiency (PCE) is still a main issue of those devices, especially in low light harvesting and the issue of electron–hole recombination that hinders the PC...

This research focuses on developing a uniquely miniaturized 4×4 Butler Matrix Network integrated with a 1×4 linear array antenna, generating four beams with exceptional isolation and transmission coefficients. Extensive analyses evaluate the antenna's radiation characteristics, including gain, directivity, and beam-forming capabilities. Innovative...

The need for biomass materials that are both cost-effective and highly effective has increased rapidly in a number of areas, including flexible electronics. The aim of this research is to investigate the properties of a screen-printed thick film of Prosopis Africana charcoal (PAC) on an alumina substrate. The biochar was obtained from the Prosopis...

This paper addresses the bandwidth limitations inherent in microstrip patch antennas, which are commonly employed in radar applications owing to their compact size and integration convenience. To overcome these limitations, this study explores the application of Prosopis Africana conductive ink-based thick film, an innovative and environmentally fr...

This study addresses the challenge of separating bacteria with similar structures such as Escherichia coli and Aeromonas hydrophila. This approach employs pulsed field dielectrophoresis assisted by laminar flow fractionation in a lab-on-a-chip system with integrated optical detection. Bacterial cells passed through 30-µm microelectrodes subjected a...

This research presents the development of a flexible dye-sensitized solar cell (FDSSC) based on titanium (Ti) foil as the photoanode and indium tin oxide-coated polyethylene terephthalate (ITO-PET) as the counter electrode (CE). The FDSSC was fabricated using the doctor blade method with excellent flexibility and mechanical durability. The performa...

The Terahertz (THz) band antenna configuration operates in the 0.1–10 THz frequency range and offers a stable performance for future 6th Generation (6G) wireless communication systems. However, the available metallic axial mode helix antenna designs exhibit a peak directivity of lower than 18 dBi within 0.5–1 THz, making it inappropriate to be appl...

Graphene, a 2D hexagonal lattice of carbon atoms, has emerged as a promising material with unparalleled properties. However, prevalent synthesis techniques often impose environmental, temporal, or scalability challenges. In this research, we reported an approach to graphene synthesis using Liquid-phase Pulsed Laser Ablation (LP-PLA) of five diverse...

The study of insect-inspired flapping robo drones is exciting and ongoing, but creating realistic artificial flapping robots that can effectively mimic insect flight is difficult due to the transmission mechanism's need for lightweight and minimal connecting components. The objective of this work was to create a system of constructing a flapping su...

Recently, significant efforts have been made to develop prostheses, soft rehabilitation, and assistive devices that enhance the quality of life of limb amputees and the activities of daily living (ADL) of stroke patients. Therefore, this present study provides a general overview of the current prosthetic, assistive, and rehabilitative devices with...

The transmission mechanism of artificial flapping-wing drones generally needs low weight and the fewest interconnecting components, making their development challenging. The four-bar Linkage mechanism for flapping actuation has generally been used till now with complex and heavy connecting designs, but our proposed novel perpendicularly organized 3...

This work enlightened the synthesis of graphenated-carbon nanotubes sheet (g-CNT) using the floating-catalyst chemical vapor deposition method (FCCVD) for dye-sensitized solar cell (DSSC) application. The carbon injection flow rate in the experiment was varied to 6, 8, and 10 ml/h. The morphological findings revealed that the g-CNT formed a highly...

After many attempts for Dye Sensitized Solar Cell (DSSC) efficiency improvement which mainly concentrated on electrode materials, sensitizers, and electrolytes, however there are only a few reports that have focused on the improvement of the interface between substrate material and semiconductor material. Therefore, the main objective of this work...

Insect RoboFlyers are interesting and active focuses of study but producing high-quality flapping robots that replicate insect flight is challenging., due to the dual requirement of both a sophisticated transmission mechanism with light weight and minimal intervening connections. This innovative mechanism was created to address the need for a produ...

An antenna for wireless communication applications, which is a simple multi-band planar antenna is offered. This work introduces an open slot antenna supplied by an E-shaped monopole for use with mobile and wireless LAN services. The objective of this paper is to design printed antennas suitable for use in LTE mobile stations. The big challenge is...

Meander line antenna (MLA) with defected ground structure, which resonant at 2.5 GHz, has been designed and examined in this paper. The antenna was built on a FR4 (r = 4.5) substrate with a thickness of 1.1 mm and a loss tangent of 0.025. To evaluate the antenna's performance, features were used operational bandwidth, gain, return loss, and radiati...

A highly sensitive silicon nanowire (SiNW)-based sensor device was developed using electron beam lithography integrated with complementary metal oxide semiconductor (CMOS) technology. The top-down fabrication approach enables the rapid fabrication of device miniaturization with uniform and strictly controlled geometric and surface properties. This...

Flying insects are interesting dipteras with an outstanding wing structure that makes their flight efficient. It is challenging to mimic flying insects and create effective artificial flapping drones that can imitate their flying techniques. The smaller insect-size drones have remarkable applications, but they need lightweight and minimal connectin...

This paper compares two TiO2 thick film gas sensors to the hydrogen at elevated operating temperatures. The first gas sensor was prepared by applying nitrogen treatment at 200 °C for 2 h to the TiO2 powder before the TiO2 paste was prepared. The second gas sensor was prepared using TiO2 powder without purification to make the TiO2 paste. Both TiO2...

According to several research circles, it is predicted that future wireless systems that employ smart antenna techniques would be more effective at using available spectrum and at building new networks at lower cost, while also improving service quality and allowing for cross-technology operation. These systems require constant monitoring in order...

This work aims to investigate formulation of thick film paste when using different types of carbon-based nanomaterials. Selected carbon-based nanopowders (carbon nanotubes, graphene nanoplatelets, reduced graphene oxide) were mixed with organic binder which consists of linseed stand oil, m-xylene and alpha terpineol to produce thick film paste. The...

In this paper a modified multi-slot patch multiband antenna is intended and analyzed by using Computer Simulation Tool Studio Suite 2016 (CST) software. Due to the extreme use of wireless communication devices, dual band or multiband antennas have received great attention for varied wireless applications. Varieties of materials with different diele...

Ammonia gas is described as toxic gas because exposure to ammonia gas by humans at high concentrations results in certain health risk factors. Therefore, it becomes imperative to develop a highly responsive gas sensor for the detection of ammonia gas. In Nigeria, there is lot of agricultural waste in the form of rice husk as a result of rice cultiv...

Dye Sensitized Solar Cell (DSSC) development is a research area that is gaining much interest. Especially in improving its efficiency including packaging and flexibility of DSSC substrate. Previous studies have shown that TiO2 semiconductor cracks after bending inevitably dropping its efficiency. Therefore, this paper proposes a simple DSSC fabrica...

This paper investigates the influences of the electrode geometry in terms of shape, configuration, dimensions, overlapping, and extensions on the dielectrophoretic (DEP) assembly of multi-walled carbon nanotube (MWCNT) bundles. A computational model was employed to predict the motion, trajectory, and assembly location of MWCNT bundles. The density...

In this study, carbon nanotubes (CNTs) were synthesized directly on coated silicon substrate via commercial microwave oven at 2.45 GHzf for3 minutes (Sample A) and 4 minutes (Sample B). The plasma provides the required temperature for catalytic decomposition of carbon source (polyethylene) at 750 ?C under atmospheric pressure. Raman spectroscopy, F...

Surfactants such as sodium dodecyl sulfate (SDS) are used to improve the dispersity of carbon nanotubes (CNTs) in aqueous solutions. The surfactant concentration in CNT solutions is a critical factor in the dielectrophoretic (DEP) manipulation of CNTs. A high surfactant concentration causes a rapid increase in the solution conductivity, while a low...

This work reports a comparative study of synthesized graphenated-carbon nanotubes cotton (g-CNTC), standard carbon nanotubes (CNTP), and conventional platinum (Pt) thin layer which are employed as the counter electrodes in dye-sensitized solar cells (DSSC). The g-CNTC was synthesized via the floating-catalyst chemical vapor deposition (FCCVD) metho...

A new high directivity all-metal helix antenna design for UWB THz radio communication is presented in this paper. The structure is based on three dimensional high aspect ratio helix antenna in order to achieve high directivity. The design is at early stage using full 3D EM simulator to analyze the performance of the suggested antenna structure. A f...

Carbon nanotubes (CNT)/polydimethylsiloxane (PDMS) have been investigated as potential materials for tomato-harvesting applications. The current-voltage (I–V) and current time (I–t) properties, as well as tomato hardness measurement and support-vector machine learning, were used to determine the performance of the sensor with respect to sensitivity...

The dielectrophoresis (DEP) method is used to fabricate sensor devices by assembling and aligning carbon nanotubes (CNTs) across electrode structures. The challenges of the method increase as the gap width between the electrodes increases. In this work, a novel DEP setup is proposed to reduce the resistance mismatch in manufacturing carbon nanotube...

In the present work, substitution of strontium U-type hexaferrite with the composition of Sr4Mn2-xZnxFe36O60 (x= 0.5,0.6,0.8, and 1.0) was prepared via high energy ball milling (HEBM) and sintered at 1100 oC. The phase, microstructure, magnetic, dielectric and electromagnetic wave absorbing properties of U-type strontium hexaferrite composites were...

Chemical and biological processes are reliant on the pH value of the elements involved in the reaction. Transparent pH sensors with a large detection area are desirable in transparent electronics and microfluidic analytical platforms. This work reports the fabrication of pH sensors using the dielectrophoresis (DEP) method. Carboxyl-functionalized m...

A new approach through heat treatment has been attempted by establishing defects by the process of quenching towards electrical and magnetic properties in the nickel zinc ferrite (Ni 0.5 Zn 0.5 Fe 2 O 4 ) sample. The measured property values in permeability and hysteresis characteristic gave their recovery behaviour in which the values, after quenc...

The assembly of carbon nanotubes (CNTs) across planner electrodes using dielectrophoresis (DEP) is one of the standard methods used to fabricate CNT‐based devices such as sensors. The medium drag velocity caused by electrokinetic phenomena such as electrothermal and electroosmotic might drive CNTs away from the deposition area. This problem becomes...

In this paper, Carbon Nanostructures (CNS) were directly synthesized on gallium orthophosphate (GaPO4). An alternative microwave enhanced chemical vapor deposition (MECVD) technique was used to synthesized the CNS via commercial microwave oven with operating power of 600 W at 2.45 GHz. Microwave heating provides the temperature for catalytic decomp...

Multi-walled carbon nanotubes (MWCNTs) can be aligned along electric field lines between transparent electrodes to form a conductive network. In this work, MWCNTs were successfully deposited across indium tin oxide (ITO) electrodes using dielectrophoretic (DEP) force. For the first time, the deposition of MWCNTs across ITO electrodes separated by a...

Terahertz (THz) band antennas are becoming a more attractive field of research due to the wide range of applications and advantages in future communications. A design of a helical antenna for ultra-high-speed THz wireless applications over short-range communication is proposed. The proposed antenna provides ultra-wideband bandwidth, high directiona...

Various doping materials, such as MWCNTs, graphene nanoflakes and MXene, have been doped into TiO2 and the hydrogen sensing properties investigated. Using a similar volume, MWCNTs (5 w.t.%) and graphene nanoflakes (5 w.t.%) and MXene (10 w.t.%) were added to TiO2 and prepared in a paste form by mixing the sensing material with the organic binder. T...

Particle manipulation is often required in the fabrication of microelectronic devices such as transistors and sensors. In this work, we succeeded in depositing aligned carbon nanotubes (CNTs) from an oxidized conglomerates carbon mixture using a simple low power procedure consisting of mild acid treatment and frequency-dependent dielectrophoretic (...

In this paper a 5G microstrip antenna operating at 28 GHz is designed and evaluated. The antenna is designed on PTFE/Teflon substrate with dielectric constant of 2.1, loss tangent of 0.0002, and thickness of 1.58 mm, and it simulated by Computer Simulation Technology (CST) software. In addition, the evaluation of the designed antenna performance is...

The major limitation of carbon nanotubes (CNTs) is their poor solubility in the common solvents. Solving the solubility issue of CNTs is comprehended either by functionalizing the CNTs or using a dispersity agent. Agents such as ionic surfactant dramatically alter the suspension conductivity causing undesirable thermal flow in dielectrophoresis (DE...

Carbon nanotubes (CNTs) are used to enhance the electrical conductivity of electronic materials, due to their outstanding electrical properties. In this article, the general concept of CNT electrical conductivity and how it enhances the electrical conductivity of electronic materials is presented. The methods used to prepare and fabricate the enhan...

This paper presents the preparation of dispersion solutions for conductive nano-ink for inkjet printers which included filler, vehicle (solvent) and additive. For fillers, multi-walled carbon nanotubes (MWCNTs) encounter major problem such as poor dispersion resulting in agglomeration, sedimentation and unstable solution, causing nozzle clogging. M...

The influence of microstructural changes from nano to micron grain size regime towards their structural, magnetic, electrical and microwave properties of gadolinium iron garnet (Gd3Fe5O12) has been investigated systematically in this research work. Raw materials were milled via high-energy ball milling (HEBM) followed by subsequent sintering (600–1...

The Terahertz (THz) frequency band (0.1-10 THz) will be used in the 6G wireless communication system to support the user demand of higher data rates and ultra-high-speed communication for many future applications. In this paper, 6G antenna specifications for these applications are highlighted. An exhaustive review of recent related-works of THz ban...

Palm kernel oil was extracted using n-hexane. Rotary evaporator and oven were used to remove n-hexane from the oil. Measurement of n-hexane in low concentration is significant and interest subject. In this study, the concentration of n-hexane was measured using the surface plasmon resonance technique. In order to improve the sensitivity of surface...

This research paper represents the design and development of a microstrip patch antenna (MPA) for the ISM (Industrial, Scientific and Medical) band spectrum applications. The main objective of this paper is to analyze the performance of the MPA design using new engineering materials (Ni0.75Zn0.25Fe2O4/MWCNT) synthesized through chemical vapour depo...

Oil palm is one of the key industries highly observed in Malaysia, due to its high demand both whether locally or internationally. The oil extraction rate (OER) in palm oil production is used as an element to identify the performance of the mills, estates and producers. In view of this, there are specific instrument or sensor needs to be implemente...

In the original article Norhafiz Azis’s last name is spelled incorrectly. It is correct as reflected here.

This study investigates the optimization of multilayer graphene (MLG) growth on Co–Ni/Al2O3 substrate. The MLG synthesized by chemical vapor deposition technique (CVD) was characterized using various instrument techniques. The surface area and pore volume of the MLG were estimated as ~ 642 m2/g and ~ 2.7 cm3/g, respectively. The Raman spectrometric...

To increase the adhesion of thick film on a substrate, boron oxide (B2O3) was added to titanium dioxide (TiO2), and the change in the morphology, crystallinity and band gap of TiO2 thick film was investigated. TiO2 and TiO2-B2O3 pastes were prepared and deposited on the microscopic glass using screen-printing technique and then annealed under air a...

The effect of different particle size obtained by diverse milling time towards the microstructure and magnetic properties of gadolinium iron garnet (GdIG) at room temperature was reported in this research work. Gadolinium iron garnet (GdIG) has been mechanically alloyed at 3, 6, 9 and 12 h followed by sintering at 1200 °C. The samples were characte...

Alternating current electro osmosis has been used both for imparting motion to fluid and for the concentration of colloidal particles in suspension. The technique has been utilised by microelectromechanical systems for lab on a chip and micro total analysis system for microfluidic devices. In this work, the phenomenon has been adopted to manipulate...

T i O 2 /B 2 O 3 gas sensor was fabricated on alumina substrate using screen-printing technology with thickness of sensing film in between of 3 – 5 µm. The sensing film of gas sensor was prepared by mixing the T i O 2 /B 2 O 3 with organic binder. The morphology and structural element of sensing film was characterized using FESEM and x-ray diffract...

There are many factors affecting oil extraction rate (OER) but a large contributor to high national OER is by processing good-quality fresh fruit bunches (FFB) at the mills. The current practice for grading oil palm fruit bunches in mills is using human graders for visual inspection, which can lead to repeated mistakes, inconsistent evaluation resu...

An octagonal microstrip patch antenna is presented in this paper. A small sized microstrip patch antenna with a high gain has been the focusing point of so many researches over the years. Microstrip patch antenna is basically known to have a low gain as a result various techniques are carried out in order to enhance the gain. In this work, a single...

This study reported an alternative technique to measure the Curie temperature (Tc) of hexagonal manganite as multiferroic sample. The method is based on change identification in slope of capacitance value as a function of temperature. Temperature variation of the capacitance observed in holmium and yttrium manganite sintered at 1250 °C has been stu...

A binder influences the sensitivity, resistivity and optimal operating temperature of a gas sensor, which plays an important role in gas sensing. This work compared the sensitivity of the TiO 2 /MWCNT/B 2 O 3 gas sensor to hydrogen with the addition of different organic binders, namely linseed oil and ethyl cellulose, to TiO 2 /MWCNT/B 2 O 3 paste....

Dielectrophoresis (DEP) is an electrode-medium process used to control the movement of Carbon nanotubes (CNTs) within a solution under nonuniform electric fields. CNTs are typically dispersed into a solvent to form a homogeneous suspension in order to prevent their aggregation and to improve solubility. This paper starts with a short review of the...

The properties of nickel zinc ferrite (Ni0·5Zn0·5Fe2O4) thick film with Ni0·5Zn0·5Fe2O4 nanopowders as active powders and linseed oil as the organic vehicle is studied and investigated in this work. Ni0.5Zn0.5Fe2O4 thick film paste samples have been prepared with various weight ratios to study the rheology properties of the pastes. Rheology results...

In the midst of technological advance where everything is connected via the internet, IoT is emerging as a potential solution to everything, ranging from health wearables to smart city. An RFEH power management system has promising benefits that could further improve the powering of IoT devices as it has potential for clean energy as well as other...

Grain size changes on microstructural and magnetic properties of holmium substituted yttrium iron garnet with x = 1.5, (Y3-xHoxFe5O12) has been discovered in this research work. The influence of grain size via sintering temperature on a sample’s properties in Holmium substituted in YIG (Ho-YIG) samples has been scrutinized experimentally. In this s...

This paper describes the development of a lab-on-chip (LOC) device that can perform reliable online detection in continuous-flow systems for microorganisms. The objective of this work was to examine the performance of a fibre optic detection system integrated into a LOC device. The microfluidic system was fabricated using dry film resist (DFR), int...

This paper describes the development of an integrated system using a dry film resistant (DFR) microfluidic channel consisting of pulsed field dielectrophoretic field-flow-fractionation (DEP-FFF) separation and optical detection. The prototype chip employs the pulse DEP-FFF concept to separate the cells (Escherichia coli and Saccharomyces cerevisiae...