Papers by Abd. Majid Wan Haliza
Journal of Research Updates in Polymer Science
Advancements in nanotechnology and materials science have led to the development of a variety of ... more Advancements in nanotechnology and materials science have led to the development of a variety of nanogenerator materials with improved properties, making energy harvesting technologies increasingly viable for various applications, such as powering wearable devices, remote sensors, and even small electronic gadgets in the future. The evolution of hybrid materials consisting of polymers and nanoparticles as efficient energy harvesters and energy storage devices is in high demand nowadays. Most investigations on organic ferroelectric P(VDF-TrFE) as a polymer host of polymer nanocomposite devices were primally focused on the β phase due to its excellent electrical properties for various application purposes. Nanofiller is also introduced into the polymer host to produce a polymer nanocomposite with enhanced properties. A brief description of various physical quantities related to ferroelectric, dielectric, pyroelectric effects and Thermally Stimulated Current (TSC) for energy harvesting...
Materials Science and Engineering: B
Electroluminescence polymer is widely utilized in the fabrication of optical display. Nowdays, at... more Electroluminescence polymer is widely utilized in the fabrication of optical display. Nowdays, attractional optical display application is toward Organic Light Emitting Diode (OLED). MEH-PPV OLED is an example of organic semiconductor, which can be produced in large area and ...
Journal of Composites Science
Photocatalytic materials are being investigated as effective bactericides due to their superior a... more Photocatalytic materials are being investigated as effective bactericides due to their superior ability to inactivate a broad range of dangerous microbes. In this study, the following two types of bacteria were employed for bactericidal purposes: Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus). The shape, crystal structure, element percentage, and optical properties of Ag9(SiO4)2NO3 were examined after it was successfully synthesized by a standard mixing and grinding processing route. Bactericidal efficiency was recorded at 100% by the following two types of light sources: solar and simulated light, with initial photocatalyst concentration of 2 µg/mL, and 97% and 95% of bactericidal activity in ultra-low photocatalyst concentration of 0.2 µg/mL by solar and simulated light, respectively, after 10 min. The survival rate was studied for 6 min, resulting in 99.8% inhibition at the photocatalyst dose of 2 µg/mL. The mechanism of bactericidal ...
IET Optoelectronics, 2019
A new unique class of foldable distance transforms of digital images (DT) is introduced, baptized... more A new unique class of foldable distance transforms of digital images (DT) is introduced, baptized: Fast exact euclidean distance (FEED) transforms. FEED class algorithms calculate the DT startingdirectly from the definition or rather its inverse. The principle of FEED class algorithms is introduced, followed by strategies for their efficient implementation. It is shown that FEED class algorithms unite properties of ordered propagation, raster scanning, and independent scanning DT. Moreover, FEED class algorithms shown to have a unique property: they can be tailored to the images under investigation. Benchmarks are conducted on both the Fabbri et al. data set and on a newly developed data set. Three baseline, three approximate, and three state-of-the-art DT algorithms were included, in addition to two implementations of FEED class algorithms. It illustrates that FEED class algorithms i) provide truly exact Euclidean DT; ii) do no suffer from disconnected Voronoi tiles, which is a unique feature for non-parallel but fast DT; iii) outperform any other approximate and exact Euclidean DT with its time complexity OðNÞ, even after their optimization; and iv) are unequaled in that they can be adapted to the characteristics of the image class at hand.
Organic electronics, 2015
Thin films consisting of non-ferroelectric inclusions of La 2 O 3 dispersed in a polymer matrix o... more Thin films consisting of non-ferroelectric inclusions of La 2 O 3 dispersed in a polymer matrix of polyvinylidene difluoride (PVDF) were prepared by the spin-coating method. It was found that the pyroelectric coefficient and remanent polarization of the composites were significantly improved to reach 42 lC/m 2 K and 84 mC/m 2 , respectively. The enhancement of the measured coefficients in the composites can be achieved by introducing a very small amount (3 wt%) of La 2 O 3. The figure of merit for material sensitivity, F D has also improved from 69 to 86 lC/m 2 K 1. A local field in the inclusion site was shown to facilitate the poling procedure. A simple Maxwell-Wagner model in which the dc conductivity of the inclusion site was taken into consideration showed a good agreement with the obtained pyroelectric and ferroelectric properties.
2020 IEEE International Conference on Semiconductor Electronics (ICSE), 2020
Fabrication of amorphous GaN thin film was performed using RF magnetron sputtering without any ex... more Fabrication of amorphous GaN thin film was performed using RF magnetron sputtering without any external temperature on silicon substrate. Thickness of deposited GaN film was approximately 200 nm. This work presents the surface morphology and roughness of amorphous GaN using FESEM and AFM analyses, respectively. The amorphous GaN had a pebble like structure with an average surface roughness of 1.34 nm. The effect of the post-annealing of the GaN thin films was also presented. The XRD result of the post annealing showed that the gallium nitride oxide present after annealing process was done at ambient condition with an average surface roughness of 1.48 nm.
Journal of Nanoscience and Nanotechnology
A simple spin-coating process for fabricating vertical organic light-emitting transistors (VOLETs... more A simple spin-coating process for fabricating vertical organic light-emitting transistors (VOLETs) is realized by utilizing silver nanowire (AgNW) as a source electrode. The optical, electrical and morphological properties of the AgNW formation was initially optimized, prior VOFET fabrication. A high molecular weight of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] MEH-PPV was used as an organic semiconductor layer in the VOFET in forming a multilayer structure by solution process. It was found that current density and luminance intensity of the VOLET can be modulated by a small magnitude of gate voltage. The modulation process was induced by changing an injection barrier via gate voltage bias. A space-charge-limited current (SCLC) approach in determining transistor mobility has been introduced. This preliminary and fundamental work is beneficial towards all-solution processing display devices.
Advanced Materials Research, 2014
The annealing temperature for 250nm PVDF-TrFE (70:30 mol %) spin coated thin films were varied at... more The annealing temperature for 250nm PVDF-TrFE (70:30 mol %) spin coated thin films were varied at solvent evaporation (Ts = 79°C), Curies transition (Tc= 113°C) till melting temperature (Tm = 154°C). From the XRD measurement, there was an improvement in the crystallinity of the annealed films, consistent with the increased in the annealing temperatures. Morphological studies of the annealed PVDF-TrFE thin films as observed with Field Emission Scanning Electron Microscope (FESEM) (100k magnification), showed enhanced development of elongated crystallite structures better known as ferroelectric crystal. However, the AN160 thin film showed fibrous-like structure with appearance of nanoscale separations, which suggested to posed high possibility of defects. Ferroelectric characterization indicated an improvement in the remnant polarization of annealed PVDF-TrFE thin films with the exception to AN160 in which leakage of current was inevitable due to the presence of cracks on the film sur...
ZnO thin films with and without Ni-doping were successfully deposited by sol-gel method with zinc... more ZnO thin films with and without Ni-doping were successfully deposited by sol-gel method with zinc acetate dihydrate as inorganic precursor, and nickel (II) acetate tetrahydrate as dopant. The solutions were prepared by dissolving zinc acetate and nickel (II) acetate in ethanol and diethanolamine (DEA) as its chelating agent. Thin films were fabricated by using spin-coating method on glass substrates. ZnO films were obtained by pre-heating and post-heating at 300 °C for 10 minutes and 500 °C for 1 h respectively. The films were analyzed by X-ray diffraction (XRD), UV-Vis transmittance and photoluminescence (PL). All samples exhibit high transparency in visible. Ni dopant does not alter so much ZnO structure, which due to the ion substitution between Ni and Zn. However, the Ni tends to create a dopant energy interlayer in ZnO energy band gap which cause significant change in PL intensity.
… Electronics, 2006. ICSE'06. …, 2006
The degradation process of a single layer electroluminescence (EL) polymer MEH-PPV Organic Light ... more The degradation process of a single layer electroluminescence (EL) polymer MEH-PPV Organic Light Emitting Diode (OLED) with the MEH-PPV thickness of 57±3 nm is discussed. Typical structure of OLED fabrication is Al/MEH-PPV/ITO (Indium Tin Oxide). Electroluminescence (EL) spectrum indicates that the emission of MEH-PPV device is the yellow orange color. The device degrades by days as demonstrated by the increased in the turn on voltage obtained from I/V curves. The Scanning Electron Microscope (SEM) images show some bubbles emerge on the surface of the device after an electric field was applied to it. I.
Australian Journal of Chemistry
Different aminoalcohol ligands, monoethanolamine (MEA), diethanolamine (DEA) and triethanolamine ... more Different aminoalcohol ligands, monoethanolamine (MEA), diethanolamine (DEA) and triethanolamine (TEA) were employed to passivate the surface of ZnO quantum dots (ZnO QDs). High-resolution transmission electron microscopy (HRTEM) imaging revealed that the higher branched aminoalcohols produced smaller sized ZnO QDs. The average size for ZnO/MEA, ZnO/DEA, and ZnO/TEA were found to be 3.2, 2.9, and 2.4 nm. TEA ligands were effective in producing stable, monodisperse ZnO QDs compared with DEA and MEA ligands. Molecular dynamics and semi-empirical calculations suggested that TEA and DEA ligands interact strongly with the partial charge of ZnO dangling bonds and have a large molar volume to hinder the diffusion of precursors through the ligands to the surface of ZnO resulting in a smaller particle size as compared with MEA ligands. As the size of ZnO QDs decreases from ZnO/MEA to ZnO/TEA, the absorption edge and emission peak maximum blue-shifts to a shorter wavelength due to the quantum...
Advanced Materials Research, 2013
The annealing temperature for 250 nm PVDF-TrFE (70:30 mol %) spin coated thin films were varied a... more The annealing temperature for 250 nm PVDF-TrFE (70:30 mol %) spin coated thin films were varied at solvent evaporation (T s = 79 ˚C), Curie's transition (T c = 113 ˚C) , till melting temperature (T m = 154 ˚C). XRD measurement showed that, there was an improvement in the crystallinity of the annealed films, consistent with the increased in the annealing temperatures. Morphological studies of the annealed PVDF-TrFE thin films as observed with Field Emission Scanning Electron Microscope (FESEM) (100k magnification), showed enhanced development of elongated crystallite structures known as ferroelectric crystal. However, thin film annealed at 160 ˚C (AN160) showed fibrous-like structure with appearance of nanoscale separations, which suggested high possibility of defects. Ferroelectric characterization indicated an improvement in the remnant polarization of annealed PVDF-TrFE thin films with the exception to AN160 in which leakage of current was inevitable due to the presence of cracks on the film surface.
Plate-shaped zinc oxide nanoparticles (ZnO-NPs) were successfully synthesized by a modified sol-g... more Plate-shaped zinc oxide nanoparticles (ZnO-NPs) were successfully synthesized by a modified sol-gel combustion method. Zinc acetate, pure water and isopropanol were used as the starting materials. Acetic acid, diethanolamine and nitric acid were used as the polymerization agent, complexing agent and fuel, respectively. The precursors were formed by mixing aqueous solutions of zinc acetate, acetic acid and diethanolamine. Nitric acid was used to dry the produced gel. The resulting xerogel was annealed at 600 8C, 650 8C and 750 8C for 1 h. The synthesized ZnO-NPs were characterized by X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA) and high-magnification transmission electron microscopy (TEM). The XRD results revealed that the samples produced were crystalline with a hexagonal wurtzite phase. The TEM results showed single-crystal ZnO-NPs with nearly hexagonal plate shapes. The optical properties of the ZnO-NPs were studied by UV-visible and Fourier-transform infrared spectroscopy (FTIR). The UV-vis absorption spectra of the ZnO-NPs indicated absorption peaks in the UV region, which were attributed to the band gap of the ZnO-NPs. The results of the FTIR and UV-vis studies showed that the optical properties of the ZnO-NPs depended on the annealing temperature. #
Thin Solid Films, 2000
Alternate layer Langmuir᎐Blodgett LB films containing cyclic polysiloxane substituted with alipha... more Alternate layer Langmuir᎐Blodgett LB films containing cyclic polysiloxane substituted with aliphatic side chains alternated with monomeric eicosylamine have been shown to exhibit pyroelectric activity. The pyroelectric activity for 5, 11, 15, 21, 25 and 31 monolayer LB films, is recorded at 21ЊC and shows highest activity for 5 monolayers with a pyroelectric coefficient of 0.5 C m y2 K y1 . The coefficient decreases as the thickness of the film increases from 5 to 15 monolayers, increases in the thickness range of Ž . 15᎐25 monolayers and decreases again for 31 monolayers film. Fourier transform infrared FTIR spectroscopy shows that proton transfer between the acid headgroups at the terminal end of the cyclic polysiloxane and the headgroups of the eicosylamine increases as the number of monolayer increases. However, the angle at which the molecular axis of the LB film tilts from the Ž surface normal, ␣ as indicated by the overall ratio of symmetric stretching of CH to CH , or asymmetric stretching of CH to 2 3 2 . CH increases as the number of monolayer increases from 5 to 15 layers and remains stable for 21᎐31 layers. ᮊ 2000 Elsevier 3 Science S.A. All rights reserved.
Journal of Luminescence, 2011
A mononuclear Sm(III) complex involving Pic and EO4 (where Pic ¼picrate anion and EO4 ¼ tetraethy... more A mononuclear Sm(III) complex involving Pic and EO4 (where Pic ¼picrate anion and EO4 ¼ tetraethylene glycol) has been studied. It shows a bright-orange emission when used as active material in a monolayer electroluminescent device of ITO/EO4-Sm-Pic/Al. The crystal structure of the complex consists of [Sm(Pic) 2 (H 2 O)(EO4)] þ cation and [Pic] À anion. The Sm(III) ion is coordinated with nine oxygen atoms from one EO4 ligand in a pentadentate mode, two Pic anions each in bidentate and monodentate modes, and one water molecule. Both the terminal alcohol groups of the acyclic EO4 ligand were involved in the O-HyO hydrogen bonding by infinite one-dimensional (1D) chain within a symmetry direction [0 1 0]. The photoluminescence (PL) spectrum of the thin film shows the typical spectral features of the Sm(III) ion ( 4 G 5/2 -6 H 7/2 transitions). The root-mean-square (rms) of the roughness of thin film is 30.605 nm and indicates that the formation of the monolayer electroluminescent device is not uniform and retains a high crystallinity. Typical semiconductor current-voltage (I-V) property was also observed in this device with threshold and turn voltages of 2.8 and 6.2 V, respectively. The [Sm(Pic) 2 (H 2 O)(EO4)](Pic) Á H 2 O complex can be applied as a luminescent center in OLED for bright-orange emission.
Spectrochimica Acta Part A-molecular and Biomolecular Spectroscopy, 2011
a b s t r a c t A mononuclear of [Eu(NO 3 )(Pic)(H 2 O) 2 (EO3)](Pic)·(0.73)H 2 O complex, where ... more a b s t r a c t A mononuclear of [Eu(NO 3 )(Pic)(H 2 O) 2 (EO3)](Pic)·(0.73)H 2 O complex, where EO3 = trietraethylene glycol and Pic = picrate anion, shows a red emission when used as an active layer in a single layer of ITO/EO3-Eu-Pic/Al configuration. The crystal structure of the complex consists of [Eu(NO 3 )(Pic)(H 2 O) 2 (EO3)] + cation and [Pic] − anion.
Materials Letters, 2011
ZnO nanoparticles were manufactured using microwave-assisted combustion. The structural and morph... more ZnO nanoparticles were manufactured using microwave-assisted combustion. The structural and morphological properties of the nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. Photocatalytic degradation of ortho-nitrophenol (O-NP) in aqueous solution using the synthesized nanoparticles was performed under UV-C irradiation and is reported for the first time. The effect of the initial O-NP concentration, amount of photocatalyst, pH, and salt was investigated during photodegradation. Analysis of the degraded samples using HPLC with UV detection revealed that photocatalysis in the presence of ZnO nanoparticles removed 98% of the O-NP in 5 h. In addition, the photocatalytic degradation kinetics of O-NP were studied, and the results suggest that the data are best fitted to pseudo-first-order kinetic and Langmuir-Hinshelwood models.
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Papers by Abd. Majid Wan Haliza