Mohd Natashah Norizan
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Mohd Natashah Norizan
Official Name
Mohd Natashah, Norizan
Alternative Name
Mohd, Natashah Norizan
Norizan, M. N.
Natashah Norizan, Mohd
Natashah, N. Mohd
Main Affiliation
Scopus Author ID
57226822517
Researcher ID
B-1263-2017

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  • Publication
    Effect of indium pre-flow on wavelength shift and crystal structure of deep green light emitting diodes
    ( 2021-01-01)
    Shamsul Amir Abdul Rais
    ;
    Hassan Z.
    ;
    Bakar A.S.A.
    ;
    Rahman M.N.A.
    ;
    Yusuf Y.
    ;
    Md Taib M.I.
    ;
    Sulaiman A.F.
    ;
    Hussin H.N.
    ;
    Mohd Fairus Ahmad
    ;
    Mohd Natashah Norizan
    ;
    Nagai K.
    ;
    Akimoto Y.
    ;
    Shoji D.
    To produce a deep green (530 nm–570 nm) LED, the suitable indium (In) composition in the InxGa1−xN/GaN multi-quantum well (MQW) structure is crucial because a lower indium composition will shift the wavelength of emission towards the ultraviolet region. In this paper, we clarify the effects of an indium-rich layer to suppress such blue shifting, especially after the annealing process. According to characterizations by the uses of XRD and TEM, narrowing of the MQW layer was observed by the indium capping, while without the capping, the annealing results in a slight narrowing of MQW on the nearest layer to the p-type layer. By adding an indium capping layer, the blue shift of the photoluminescence was also suppressed and a slight red shift to keep green emission was observed. Such photoluminescence properties were consistent with the tiny change of the MQW as seen in the XRD and TEM characterizations.
  • Publication
    Charge recombination in zinc oxide-based dye-sensitized solar cell: a mini review
    ( 2021-12)
    Kaiswariah Magiswaran
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Norsuria Mahmed
    ;
    Siti Norhafizah Idris
    ;
    Sharizal Ahmad Sobri
    Dye-sensitized solar cell (DSSC) has been studied widely due to its efficiency and the simplicity of manufacturing technology. Much research has been performed to improve the photovoltaic output parameters in DSSC by modifying the photoanode layers. The efforts to investigate DSSC mainly focus on how to increase light absorption, speed electron transport in circuits, and reduce charge recombination. This review discusses the process of charge recombination and the paths of occurrence in a DSSC. Recombination occurs when the electrons in the conduction band fall into the valance band holes and is considered an unnecessary process in DSSC. Due to the recombination process, the photocurrent and the photovoltage are reduced, leading to lower power conversion efficiency. Hence, the ways to overcome the charge recombination process were also discussed.
  • Publication
    Modification of photoanode surface structure via image analysis on organic polymer material based for dye-sensitized solar cell (DSSC) applications
    ( 2021-12)
    N. Rosli
    ;
    Norhayati Sabani
    ;
    MF Ahmad
    ;
    Mohd. Azarulsani Md. Azidin
    ;
    Nurjuliana Juhari
    ;
    NF Zakaria
    ;
    Mohd Natashah Norizan
    ;
    Safizan Shaari
    In this study, the experiment on the modification of the photoanode with organic polymer material as copolymer template for dye-sensitized solar cell (DSSC) applications has been conducted. The two organic copolymer templates are polystyrene sphere (PS) and poly[2- methoxy-5(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). The modification photoanodes were made using Dr. Blade’s method. These organic copolymer templates were added to improve the surface of the mesoporous titanium dioxide (TiO₂) layer, which is used as the main component in DSSC photoanode. The unmodified TiO₂ photoanode has poor aggregation and porosity of TiO₂. The addition of either MEH-PPV or PS sphere to the photoanode layer was found to affect the surface of mesoporous TiO₂ in terms of porosity, particle size distribution and shape. The analysis of the TiO2 modification was conducted using an image analysis processing method via a 2D scanning electron microscope (SEM) image. The image analysis processing method used was the ImageJ program. The DSSC of modified photoanode is fabricated using metal complex dye, Ruthenium (N719) dye. The data collected from the ImageJ program showed that by adding organic copolymer templates into TiO₂, the porosity of TiO₂ decreased from 45 % to 42 %. From the photovoltaic analysis obtained, the J-V characteristic is recorded with the photoanode of TiO₂ mixed with 1.00 wt% MEH-PPV gave the highest efficiency, which is 0.01 % with the following parameters – Voc = 0.43 V, Jsc = 0.17 mA/cm2 and FF = 0.20. Meanwhile, the photoanode of TiO₂ mixed with 0.50 wt% PS sphere gave the highest efficiency which is 0.08 % with the following parameters – Voc = 0.39 V, Jsc = 0.86 mA/cm2 and FF = 0.25.
  • Publication
    Synthesis methods of tin oxide as photoanode for dye-sensitized solar cell performance- a short review
    ( 2021-12)
    Siti Norhafizah Idris
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Norsuria Mahmed
    ;
    Kaiswariah Magiswaran
    ;
    Sharizal Ahmad Sobri
    This review focused on the synthesis methods of tin oxide (SnO₂) nanoparticles as a photoanode for dye-sensitized solar cell (DSSC) and how it impacts the performance. There are many different techniques and various nanoparticles were produced and usually characterized by X-ray diffraction (XRD) to determine crystalline structure of SnO₂, scanning electron microscopy (SEM) to examine the surface morphology and size details and J-V solar simulator to verify current-voltage characteristics. In summary, considering all the methods reviewed, sol-gel is reported as the best method to produce SnO₂ nanoparticles for DSSC fabrication with the highest efficiency recorded of 3.96%.
  • Publication
    Life cycle assessment (Lca) of particleboard: Investigation of the environmental parameters
    ( 2021-07-01)
    Mohd Azman M.A.H.
    ;
    Ahmad Sobri S.
    ;
    Mohd Natashah Norizan
    ;
    Ahmad M.N.
    ;
    Wan Ismail W.O.A.S.
    ;
    Hambali K.A.
    ;
    Hairi M.H.
    ;
    Hermawan A.
    ;
    Mohamed M.
    ;
    Teo P.T.
    ;
    Taharin M.R.
    ;
    Noor N.A.M.
    Particleboard is not entirely a wood replacement but a particular material with its properties, making it more effective at different times than heavy or solid wood. The world’s biggest concern is environmental problems with formaldehyde as a particulate board binder that can lead to human carcinogenic agents. A cradle-to-gate life cycle assessment (LCA) of particleboard production was performed using openLCA software. The impact assessment was carried out according to the software’s features. This preliminary investigation aims to analyze the chemical composition of particleboard and identify its environmental impact. The Fourier-transform infrared spectroscopy (FTIR) system was used to track the functional group of aliphatic hydrocarbons, inorganic phosphates, and main aliphatic alcohols found in particleboards made in Malaysia. Based on the FTIR results, aliphatic groups were found in numerous aggravates that the spectroscopic infrared was likely to experience. The most important vibrational modes were C–H, at approximately 3000 cm−1, and –CH deformations around 1460 cm−1 and 1380 cm−1 . Eight effect groups demonstrated that 100% of the input and all analyses produced the same relative outcome. The life cycle of a product is determined by pollution of the air, water, and soil. Thus, particleboard has a minimal impact on the environment, except for global warming.
  • Publication
    Failure mode and effects analysis (FMEA) of furniture production: A case study in Kelantan state, Malaysia
    ( 2021-05-03)
    Ahmad M.F.
    ;
    Sobri S.A.
    ;
    Abdullah N.A.N.
    ;
    Kamarudin N.M.F.N.
    ;
    Mohamed M.
    ;
    Hermawan A.
    ;
    Boon J.G.
    ;
    Ismail W.O.A.S.W.
    ;
    Mohd Natashah Norizan
    The primary objective of this research is to study the critical region of the local furniture manufacturing company by using a Failure Mode and Effects Analysis (FMEA). At the same time, the study also aims to help the organization to minimize production costs by presenting the preliminary stage of the results of the assessment. Many industries used FMEA as a method to improve the evaluation of the reliability of a production process. The use of FMEA is to analyze the layout characteristics of the planned production process in order to ensure that the final product meets customer requirements and expectations. It uses probabilities of detection and occurrence added with a few severity standards to create a risk priority number (RPN) for rating improvement action considerations. Utilized in both the manufacturing and design processes, they notably help to reduce cost factors with the aid of determining product and process improvements early within the development process while changes are inexpensively and relatedly easy to do. Based on the results, there were two failure modes with a higher RPN. The assessment is deductive as it periodically moves from one source to another. Thus, it can assist the company in improving its manufacturing process by reducing the mistakes that been made by identifying the cause and effect of it.
  • Publication
    Near-Infrared (NIR) Silver Sulfide (Ag₂S) Semiconductor Photocatalyst Film for Degradation of Methylene Blue Solution
    ( 2023-01-01)
    Mubarokah Z.R.
    ;
    Norsuria Mahmed
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Błoch K.
    ;
    Nabiałek M.
    ;
    Baltatu M.S.
    ;
    Sandu A.V.
    ;
    Vizureanu P.
    A silver sulfide (Ag2S) semiconductor photocatalyst film has been successfully synthesized using a solution casting method. To produce the photocatalyst films, two types of Ag2S powder were used: a commercialized and synthesized powder. For the commercialized powder (CF/comAg2S), the Ag2S underwent a rarefaction process to reduce its crystallite size from 52 nm to 10 nm, followed by incorporation into microcrystalline cellulose using a solution casting method under the presence of an alkaline/urea solution. A similar process was applied to the synthesized Ag2S powder (CF/syntAg2S), resulting from the co-precipitation process of silver nitrate (AgNO3) and thiourea. The prepared photocatalyst films and their photocatalytic efficiency were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV-visible spectroscopy (UV-Vis). The results showed that the incorporation of the Ag2S powder into the cellulose films could reduce the peak intensity of the oxygen-containing functional group, which indicated the formation of a composite film. The study of the crystal structure confirmed that all of the as-prepared samples featured a monoclinic acanthite Ag2S structure with space group P21/C. It was found that the degradation rate of the methylene blue dye reached 100% within 2 h under sunlight exposure when using CF/comAg2S and 98.6% for the CF/syntAg2S photocatalyst film, and only 48.1% for the bare Ag2S powder. For the non-exposure sunlight samples, the degradation rate of only 33–35% indicated the importance of the semiconductor near-infrared (NIR) Ag2S photocatalyst used.
      2
  • Publication
    Comparative analysis on virtual private network in the internet of things gateways
    ( 2022-10-01)
    Zakaria M.I.
    ;
    Mohd Natashah Norizan
    ;
    Muammar Mohamad Isa
    ;
    Jamlos M.F.
    ;
    Mustapa M.
    A virtual private network (VPN) connects a private network to the internet, primarily the public network, through a secure tunnel. Using a local area network (LAN) segment, users can send and receive data from their colleagues in different locations on the network. The development of VPN allows users to gain access to company applications and databases. Therefore, data can be transmitted through a secure tunnel without the need to configure port forwarding for the internet of things (IoT) gateway, allowing users to access it from any location in the world. A method such as dataplicity and pitunnel was examined to compare with the conventional setting. This research paper examines the current deployment of VPN connections in IoT gateways, discussing their characteristics, benefits, and drawbacks, as well as comparing them. The advantage of this method is that the IoT gateway is always accessible and has internet connectivity, which is a significant benefit. Dataplicity is a more trustworthy option because they offer excellent assistance for both the backend and frontend environments.
      19  2
  • Publication
    Recent advances in synthesis of graphite from agricultural bio-waste material: a review
    ( 2023)
    Yee Wen Yap
    ;
    Norsuria Mahmed
    ;
    Mohd Natashah Norizan
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Midhat Nabil Ahmad Salimi
    ;
    Kamrosni Abdul Razak
    ;
    Ili Salwani Mohamad
    ;
    Mohd. Mustafa Al Bakri Abdullah
    Graphitic carbon is a valuable material that can be utilized in many fields, such as electronics, energy storage and wastewater filtration. Due to the high demand for commercial graphite, an alternative raw material with lower costs that is environmentally friendly has been explored. Amongst these, an agricultural bio-waste material has become an option due to its highly bioactive properties, such as bioavailability, antioxidant, antimicrobial, in vitro and anti-inflammatory properties. In addition, biomass wastes usually have high organic carbon content, which has been discovered by many researchers as an alternative carbon material to produce graphite. However, there are several challenges associated with the graphite production process from biomass waste materials, such as impurities, the processing conditions and production costs. Agricultural bio-waste materials typically contain many volatiles and impurities, which can interfere with the synthesis process and reduce the quality of the graphitic carbon produced. Moreover, the processing conditions required for the synthesis of graphitic carbon from agricultural biomass waste materials are quite challenging to optimize. The temperature, pressure, catalyst used and other parameters must be carefully controlled to ensure that the desired product is obtained. Nevertheless, the use of agricultural biomass waste materials as a raw material for graphitic carbon synthesis can reduce the production costs. Improving the overall cost-effectiveness of this approach depends on many factors, including the availability and cost of the feedstock, the processing costs and the market demand for the final product. Therefore, in this review, the importance of biomass waste utilization is discussed. Various methods of synthesizing graphitic carbon are also reviewed. The discussion ranges from the conversion of biomass waste into carbon-rich feedstocks with different recent advances to the method of synthesis of graphitic carbon. The importance of utilizing agricultural biomass waste and the types of potential biomass waste carbon precursors and their pre-treatment methods are also reviewed. Finally, the gaps found in the previous research are proposed as a future research suggestion. Overall, the synthesis of graphite from agricultural bio-waste materials is a promising area of research, but more work is needed to address the challenges associated with this process and to demonstrate its viability at scale.
      15  19
  • Publication
    Electrical performance of Curcuma Longa extract dye using SnO₂-based photoanode dye-sensitized solar cell
    ( 2022-12)
    Siti Norhafizah Idris
    ;
    Ili Salwani Mohamad
    ;
    Norsuria Mahmed
    ;
    Mohd Natashah Norizan
    ;
    Kaiswariah Magiswaran
    ;
    Zuraida Abal Abas
    Due to their low output costs, straightforward manufacturing, and high effectiveness, dyesensitized solar cell (DSSC) has a large following interest in the solar energy industry. Furthermore, due to its outstanding properties, tin oxide (SnO₂) is an appealing semiconducting material suitable as a photoanode in DSSCs. In this research, the photoelectrodes of DSSC were fabricated using commercial SnO₂ nanoparticles and sensitized with inorganic and organic dyes, N719 and Curcuma longa (turmeric) extract dye. On top of that, a platinum (Pt) counter electrode, iodide electrolyte and fluorine-doped tin oxide (FTO) coated glass substrate were used to fabricate the DSSC. The crystallographic structure and surface morphology of the SnO₂ nanopowder were identified using X-ray diffraction (XRD) and scanning electron microscopy (SEM) characterizations respectively. In addition, UV-Visible and current density-voltage curves were used to analyze the optical properties of the photoanodes and the cell’s electrical performance. As a result, it was found that the DSSC fabricated with N719 dye exhibited higher efficiency in contrast with the turmeric extract dye with SnO₂ photoanodes.
      1  26