Muhammad Mahyiddin Ramli
Thumbnail Image
Preferred name
Muhammad Mahyiddin Ramli
Official Name
Muhammad Mahyiddin, Ramli
Alternative Name
Ramli, Muhammad Mahyiddin
Ramli, M. Muhammad
Ramli, M. M.
Ramli, M.
Ramli, Muhammad Mahyidin
Mahyiddin Ramli, Mohd
Ramli, Muhammad M.
Main Affiliation
Scopus Author ID
55891565000
Researcher ID
AAH-1285-2021

Research Output
Now showing 1 - 4 of 4
  • Publication
    Effect of sodium ion addition on copper selenide/chitosan film towards electrical and shielding efficiency improvement
    ( 2024-06)
    Nurul Najiha Mazu
    ;
    Hazeem Ikhwan Mazlan
    ;
    Josephine Ying Chyi Liew
    ;
    Nurul Huda Osman
    ;
    Muhammad Mahyiddin Ramli
    ;
    Ali Reshak
    The operation of electronic devices can be disrupted by unwanted electromagnetic signals, affecting its operation. Deploying electromagnetic shielding is a viable solution to minimize the impact of electromagnetic interference (EMI). The conventional methods of electromagnetic shielding use metal gaskets to safeguard sensitive electronic components, which have drawbacks of cost and weight. Hence, electromagnetic shielding polymer can be an alternative to replace metal gaskets. This work investigates the effect of sodium ion (Na) addition to copper selenide/chitosan (CuSe/Ch) film for electromagnetic shielding applications. The shielding polymers were produced using solution casting methods, while the CuSe was synthesized using the chemical coprecipitation method. Impedance spectroscopy and two port waveguide methods were used to characterize the prepared polymer's electrical properties and shielding efficiency. The results indicate that Na incorporation in the CuSe/Ch film resulted in a 47 % decrease in bulk resistivity and increased DC conductivity from 6.07 × 10-6 S/cm to 3.69 × 10˗5 S/cm. The AC conductivity of films containing Na demonstrates a similar level of conductivity at lower frequencies, followed by a sharp increase at higher frequencies, indicating a more substantial influence of Na at higher frequencies. Higher absorption shielding efficiency (SEA) and lower reflection shielding efficiency (SER) were achieved by introducing Na into the CuSe chitosan film. The Na/CuSe/Ch film shows higher total shielding efficiency at an average of 20 dB, equivalent to 99 % of the EM power shield.
  • Publication
    Fabrication of Strontium Titanate thin film with pre-crystallized layer via sol-gel spin coating method
    ( 2022-12)
    Kelvin Voon Yan Jie
    ;
    Mohd Fairus Ahmad
    ;
    Muhammad Mahyiddin Ramli
    ;
    Safizan Shaari
    ;
    Arif Mawardi Ismail
    ;
    Yusran Sulaiman
    The technique of pre-crystallized layer is introduced in the strontium titanate (STO) thin film fabrication to improve the coating thickness and the crystallinity. The STO thin films were fabricated on glass substrates via the spin coating method with STO precursor solution that was synthesized through the sol-gel process. The characteristics of the thin films were analyzed through X-ray diffraction (XRD) analysis, profilometry, UV-Vis spectra analysis and scanning electron microscopy (SEM) analysis. In the present study, the samples of 20 layers and 25 layers (deposited on the pre-crystallized layer) exhibited better crystallinity as compared with the samples of 5 layers, 10 layers and 15 layers (without the pre-crystallized layer). The samples of 25 layers exhibited the highest film thickness (224 nm), highest absorbance intensity and the highest XRD peak intensity at 32, 40, 47 and 58°, which represent the planes (110), (111), (200) and (210), respectively. The pre-crystallized layer served as the mechanical support for further layer deposition.
      1  7
  • Publication
    A review of visible-to-UV photon upconversion systems based on triplet–triplet annihilation photon upconversion
    ( 2022-12)
    Kelvin Voon Yan Jie
    ;
    Mohd Fairus Ahmad
    ;
    Muhammad Mahyiddin Ramli
    ;
    Safizan Shaari
    ;
    Arif Mawardi Ismail
    ;
    Yusran Sulaiman
    Due to the tunable spectrum range and potential application under non-coherent solar irradiation, triplet-triplet annihilation based molecular photon upconversion (TTA-UC) systems represent a compelling study field for a variety of photonic implementations. There were studies on the incorporation of TTA-UC technology with photovoltaic technology, which made it possible to further improve the energy harvest performance through the utilisation of the wasted spectrum. However, many TTA-UC studies are limited to energy upconversion within the visible spectrum range. For photovoltaic cells with a higher band gap, which harvest the higher energy spectrum (UV region), an efficient Vis-to-UV upconversion is preferred. The Vis-to-UV TTA-UC system was first introduced in 2006. Recently, more studies were conducted to discover the Vis-to-UV upconversion system with high quantum efficiency and low excitation intensity such as the nanocrystal sensitizerbased system and the thermally activated delayed fluorescence sensitizer-based system. Recent studies in the solvent system of Vis-to-UV upconversion system had demonstrated the dependence of the couple photostability on the solvent and extended the solvent selection to inorganic solvent. In this review, we are reviewing the research background of the Vis-to-UV TTA-UC system and discussing the current challenges and potential developments in this research area.
      1  8
  • Publication
    Production of low temperature synthetic graphite
    ( 2023-04)
    Anis Syafiqa Rosman
    ;
    Ranjitha Navalan
    ;
    Muhammad Mahyiddin Ramli
    ;
    Norizah Abd Karim
    ;
    Mohd Fairus Ahmad
    ;
    Shazlina Johari
    ;
    Norshamsuri Ali @ Hasim
    ;
    Nurul Huda Osman
    Synthetic graphite is a material consisting of graphitic carbon which has been obtained by graphitizing a non-graphitic carbon. The growth in demand, particularly in customizing properties for certain usage has brought about research on viable alternative, low-cost, and environmentally pleasant synthetic graphite production. Biomass wastes are amongst appealing carbon precursors which have been broadly checked out as replacement carbon for graphite production. This research aimed to synthesize synthetic graphite from oil palm trunks at low temperatures (500 °C, 400 °C and 300 °C) under controlled conditions to determine the physical properties and properties of the graphite obtained. After the heat treatment process, the obtained samples were then characterized by using XRD, SEM and RAMAN characterizations. Based on SEM and RAMAN characterization, it can be seen that graphite that undergoes a 500 °C pyrolysis process shows the best results compare to graphite that undergoes a pyrolysis process at the temperatures of 300 °C and 400 °C. The graphite flakes and the peaks obtained for 500 °C graphite are obviously present. For XRD characterization, the best samples at 500 °C were chosen to be characterized. From the results, the sample shows slight behavior imitating the commercialized graphite. Hence, from the characterizations of the samples, it can be concluded that the best synthetic graphite produced was from the oil palm trunks heated at 500 ° C
      2  14