Muhammad Mahyiddin Ramli

Muhammad Mahyiddin Ramli

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

Faculty of Electronic Engineering & Technology

Scopus Author ID

55891565000

Researcher ID

AAH-1285-2021

Now showing 1 - 10 of 49

Remazol orange dye sensitized solar cell

( 2017-01-03)
Siti Salwa Mat Isa
;
Muhammad Mahyiddin Ramli
;
Nor Azura Malini Ahmad Hambali
;
Muda M.R.
;
Shahrir Rizal Kasjoo
;
Muammar Mohamad Isa
;
Nurul Izza Mohd Nor
;
Norhawati Ahmad
;
Nazuhusna Khalid
;
Nur M. Selamat
;
Nur Asyikin Mohd Anhar

Water based Remazol Orange was utilized as the dye sensitizer for dye sensitized solar cell. The annealing temperature of TiO2 working electrode was set at 450 °C. The performance of the device was investigated between dye concentrations of 0.25 mM and 2.5 mM at three different immersion times (3, 12 and 24 hours). The adsorption peak of the dye sensitizer was evaluated using UV-Vis-Nir and the device performance was tested using solar cell simulator. The results show that the performance was increased at higher dye concentration and longer immersion time. The best device performance was obtained at 0.2% for dye concentration of 2.5 mM immersed at 24 hours.
Single wall carbon nanotubes dispersion study of different dye molecules and chitosan

( 2017-09-26)
Muhammad Mahyiddin Ramli
;
Siti Salwa Mat Isa
;
Mohd. Mustafa Al Bakri Abdullah
;
Sohiful Anuar Zainol Murad

Carbon Nanotubes (CNTs) is known for their hydrophobicity ability. However, this ability can become the bottleneck for the application of CNTs where a highly dispersion of materials are needed. In this project, different dispersing agents were investigated namely dye molecules and chitosan. Three different dyes are studied with different concentration, including 0.05 % of chitosan. The dispersion quality is determined by examining through UV-Vis-NIR. The best dispersion quality investigated here is when the concentration of dye molecules is higher, which is around 2.5 mM.
Effect of soaking time towards graphitization of empty fruit bunch (EFB) waste

(AIP Publishing, 2023)
Norizah Abd Karim
;
Che Mohd Ruzaidi Ghazali
;
Muhammad Mahyiddin Ramli
;
Marniati
;
Zulfadhli, M. R.M.
;
Mutiawati

Empty fruit bunch (EFB) are the second-highest waste produced in the oil palm industry which is 18 022 tonnes in a year. However, the presence of oil palm waste especially from empty fruit bunch (EFB) give a major problem to the disposal. Herein, EFB waste has been identified as a potential carbon source for synthetic graphite production. This is due to implement the lower heating temperature of synthetic graphite produced in controlled heating conditions. Several parameters have been manipulated to study the effect of various parameters on the graphitization process. Hence, in this study, the effect of soaking time towards graphitization of empty fruit bunch (EFB) waste has been investigated. EFB waste was heat treated with various soaking times which is 2 hours, 2.5 hours and 3 hours in controlled heating conditions with constant heating temperature at 500°C and heating rate at 10°/minute After heating treatment, the samples were characterized using X-ray Diffraction (XRD) and analyzed by X'Pert Highscore Plus software. The functional group of synthetic graphite was determined by using Fourier Transform Infrared spectroscopy (FTIR). The morphological study was carried out by using Scanning Electron Microscope (SEM). From the analysis, the best synthetic graphite produced is at the 2.5 hours soaking time with a constant heating temperature at 500°C and a constant heating rate at 10°/min.
Semiconducting biomass-based amorphous carbon films and their potential application in photovoltaic devices

(Elsevier Ltd, 2025)
Endhah Purwandari
;
Retno Asih
;
Sudarsono
;
Diky Anggoro
;
Gerald Ensang Timuda
;
Malik Anjelh Baqiya
;
Iman Santoso
;
Hideki Nakajima
;
Muhammad Mahyiddin Ramli
;
Agus Subekti
;
Darminto

Amorphous carbon (aC) is highly appealing because of its unique structure, electrical and optical properties, making it appropriate for various applications, especially in energy conversion. This work presents a comprehensive study on the synthesis of aC materials, including both intrinsic (i-type) and doped conditions (p- and n-type), to enhance the performance of photovoltaic films. Carbon materials are derived from biomass using a straightforward and environmentally conscious technique. The obtained carbon compound demonstrates an amorphous state with a substantial prevalence of the sp2 C=C component. Raman spectroscopy and electron microscopy confirmed the stacking of 2D layers forming a multilayer graphene structure. The carbon compound prepared AC films deposited onto a quartz glass surface via spray coating. The films have a thickness ranging from 247 to 478 nm. The dielectric constants of the optical parameters reveal resonant exciton features at a photon energy of ∼3.8 eV, whereas the real component exhibits semiconductive properties. The refractive indices of the p-, i-, and n-layers, which have gap energies in decreasing order, demonstrate a decline. The optical conductivity of aC is higher than that of amorphous silicon, specifically 0.54 × 103Ω−1cm−1, 0.48 × 103 Ω−1cm−1, and 0.53 × 103 Ω−1cm−1 for the p-, i-, and n-type films, respectively. Based on this outcome, it is reasonable to suggest that the recently developed material is potentially important as a photovoltaic device.
Binding dynamics and conformational stability of graphene-based nanomaterials with Mutant LOX-1: Insights from molecular docking and dynamics simulations in atherosclerosis

(Springer, 2024-12)
Farizah Hanim Lat
;
Ahmad Naqib Shuid
;
Mohd Yusmaidie Aziz
;
Muhammad Mahyiddin Ramli
;
Rafeezul Mohamed

Oxidized low-density lipoprotein (oxLDL) is a critical factor in endothelial dysfunction and serves as an important biomarker for oxidative stress. Recent research has focused on lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1), a receptor for oxLDL that plays a significant role in atherosclerosis progression. Mutant LOX-1 may show changes in its binding affinity for oxLDL, potentially leading to variations in oxLDL uptake and foam cell formation. Our previous investigation into graphene-based nanomaterials and their interactions with atherosclerosis-related proteins, including LOX-1, provided important insights into their binding characteristics. In this study, we delve deeper into the binding dynamics between graphene-based nanomaterials and mutant LOX-1, aiming to clarify their implications for atherosclerotic development. Using molecular docking techniques with AutodockVina and active site predictions from P2Rank, we evaluated the binding affinities of graphene, graphene oxide (GO), and reduced graphene oxide (rGO) to mutant LOX-1. Notably, all docking scores were below -5 kcal/mol, indicating strong interactions with the receptor. To investigate the dynamics of these interactions further, we performed molecular dynamics (MD) simulations using the CHARMM force field. Our simulations revealed significant conformational changes within the first 100 ns, particularly in the mutant LOX-1 and GO complex, which suggested improved binding stability. These results enhance our understanding of how graphene-based nanomaterials interact with mutant forms of LOX-1, offering potential avenues for targeted therapies in atherosclerosis management related to LOX-1 dysregulation.
Biomass Waste Incorporation in La₀.₆Sr₀.₄Co₀.₂Fe₀.₈O₃-α˗Ba(Ce₀.₆Zr₀.₄)₀.₉Y₀.1O₃-δ composite cathode: effects on microstructural and physical properties

(Chemistry Department, Universitas Gadjah Mada, 2025)
Ismariza Ismail
;
Nur Ashafieka Abdullah
;
Norizah Abd Karim
;
Shazlina Johari
;
Muhammad Mahyiddin Ramli

This study explores the incorporation of rice straw as a pore-forming agent in fabricating the La₀.₆Sr₀.₄Co₀.₂Fe₀.₈O₃-α˗Ba(Ce₀.₆Zr₀.₄)₀.₉Y₀.1O₃–δ (LSCF-BCZY) composite cathode, focusing on its microstructural and physical properties. Conventional cathode materials often face challenges in balancing porosity and structural stability, with synthetic pore formers posing environmental and consistency concerns. To address these issues, rice straw was introduced into the cathode matrix at varying weight percentages, and the composites were sintered at 1000 °C. The addition of rice straw was evaluated using X-ray diffraction, scanning electron microscopy, and densitometry. The results revealed that increasing rice straw content significantly enhanced cathode porosity, rising from 5.53 to 27.74%, with a concomitant reduction in density from 1.33 to 0.93 g/cm3, while maintaining the crystalline stability of the LSCF-BCZY composite. Enhanced porosity suggests improved reactant diffusion to active sites, potentially benefiting the cell's performance in future energy applications. This work highlights the potential of agricultural waste as a sustainable and effective alternative to synthetic pore formers in cathode fabrication.
The Effect of GO/TiO2 Thin Film During Photodegradation of Methylene Blue Dye

( 2021)
Azliza Azani
;
Dewi Suriyani Che Halin
;
Mohd. Mustafa Al Bakri Abdullah
;
Kamrosni Abdul Razak
;
Mohd Fairul Sharin Abdul Razak
;
V Chobpattana
;
Mohd Arif Anuar Mohd Salleh
;
Muhammad Mahyiddin Ramli

Titanium (IV) isopropoxide (TTIP) was used to synthesize GO/TiO2 thin films using a sol-gel spin-coating method onto a glass substrate, undergoing an heat tretment at 350 °C. Several amounts of graphene oxide (GO) (0-20mg) were weighed into a sol solution of TiO2 to produce GO/TiO2 thin films. The thin film samples were characterized by X-ray diffraction (XRD) to analyze the samples’ phase and by scanning electron microscopy (SEM) to analyze the samples’ microstructure. Physical testing such as water contact angle (WCA) was analyzed using an optical microscope with J-Image software. In contrast, the optical band gap and photodegradation of methylene blue under sunlight irradiation of the thin film was analyzed using UV-VIS spectrophotometry. GO5 thin film sample showed low-intensity anatase phase formation, where the microstructure revealed a larger surface area with the addition of GO. WCA reveals that GO/TiO2 thin film exhibits super hydrophilic properties where the angle decreases from 37.83° to 4.11°. The optical result shows that GO has improved the absorption edges by expanding into visible regions. Moreover, due to the existence of GO 3.30 eV band gap energy of TiO2 decreases from to 3.18 eV obtained by GO5. The improved adsorption edge allows Ti3+, O2 and interstitial states to be formed in low valence states with energy underneath than in the TiO2 band gap. Therefore, the photodegradation of methylene blue (MB) dye increases from 48 % to 59 % in the GO/TiO2 thin film.

1 70
Effect of polyethylene glycol and sodium dodecyl sulphate on microstructure and self-cleaning properties of graphene oxide/TiO2 thin film

( 2020-09-01)
Azani A.
;
Dewi Suriyani Che Halin
;
Kamrosni Abdul Razak
;
Mohd. Mustafa Al Bakri Abdullah
;
Norsuria Mahmed
;
Muhammad Mahyiddin Ramli
;
Mohd Arif Anuar Mohd Salleh
;
Mohd Fairul Sharin Abdul Razak
;
Ayu Wazira Azhari
;
Chobpattana V.
;
Kaczmarek L.

In this study, a sol gel procedure for preparation of TiO2 thin films with graphene oxide (GO) was developed. The effect of PEG and SDS addition on the microstructure of the films as well as the photocatalytic activity of the thin film was also investigated. The morphology and surface structure of the films were studied by SEM and AFM while the photocatalytic activity of the films was analyzed by measuring the degradation of methylene blue under sunlight irradiation using UV-Vis spectrophotometer. It was found that GO/TiO2 thin film with PEG shows a smaller and porous particle while GO/TiO2 thin film with SDS formed a very smooth surface and very fine particles. Therefore, in AFM analysis reveals that surface roughness decreases with the addition of PEG and SDS. Finally, the photocatalytic activity showed that GO/TiO2 thin film with SDS have the most effective self-cleaning property which degrade 64% of methylene blue that act as model of contaminants.

1
Graphitization of empty fruit bunch (EFB) waste at lower heating temperature

(AIP Publishing, 2023)
Norizah Abd Karim
;
Che Mohd Ruzaidi Ghazali
;
Muhammad Mahyiddin Ramli
;
Marniati
;
Desita Ria Yusian
;
Muhammad Zulfadhly Mohd Fazil

Previously, synthetic graphite was produced at higher heating temperature, which is above 2500°C in complex processing method and by using petroleum coke, anthracite, and coal tar pitch as the starting materials. These materials are known as non-waste sources. Therefore, in this study, Empty Fruit Bunch Waste (EFB) has been identified as a potential carbon source from waste to replace the non-waste sources of starting materials for synthetic graphite production. Hence, by implementing a controlled heating condition via pyrolysis process, with fixed heating rate and soaking time, Empty Fruit Bunch Waste (EFB), was heated at 3 different series of heating temperatures, which are, 300°C, 400°C and 500°C. The heating rate applied was maintained at 10°/min and the soaking time used 3 hours. After the heating treatment, the synthetic graphite obtained was characterized by various analytical tools, including, X-Ray Diffraction (XRD) analysis, Scanning Electron Microscope (SEM) analysis, and Fourier Transform Infra-Red (FTIR) Analysis. Based on the analysis, it was confirmed that synthetic graphite was successfully synthesized by heat treatment at 500 °C with 10°/min of heating rate and 3 hours soaking time. Synthetic graphite was observed in the form of amorphous carbon based on the XRD diffraction pattern that matches with the reference code of 00-041-1487.

1 11
Surface Modification of GO/TiO2 Thin Film by Sodium Dodecyl Sulphate for Photocatalytic Applications

( 2024-01-01)
Azliza Azani
;
Dewi Suriyani Che Halin
;
Mohd Arif Anuar Mohd Salleh
;
Kamrosni Abdul Razak
;
Mohd. Mustafa Al Bakri Abdullah
;
Muhammad Mahyiddin Ramli
;
Vizureanu P.
;
Mohd Fairul Sharin Abdul Razak
;
Sandu A.V.
;
Mohamad N.

Photocatalyst material titanium dioxide (TiO2) and graphene oxide (GO) were used to improve the self-cleaning properties of thin films. The sol–gel spin-coating method was successfully used to synthesize GO/TiO2 thin films. Surface modification was applied to optimize the self-cleaning capabilities by adding several concentrations of sodium dodecyl sulfate (SDS) (0.1 w/v%, 0.2 w/v%, 0.3 w/v%, 0.4 w/v%, and 0.5 w/v%) to the parent solution. The synthesized thin films were investigated using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction, UV-visible spectroscopy, water contact angle analysis, and photocatalytic analysis. The AFM and SEM images revealed that as the SDS amount increased, the particles became less agglomerated, and the roughness of the surface reduced from 2.54 × 102 nm to 0.83 × 102 nm. The wettability analysis showed that when SDS increased to 0.4 w/v%, the water contact angle dropped to 15.30°, implying that the thin film exhibits hydrophilic qualities. A decrease in the GO/TiO2 band gap was obtained linearly with the increase in SDS addition from 3.17 eV to 2.75 eV. Finally, the improvement of the surface coating and reduction of the band gap enhanced the photocatalytic activity, which degraded 78.97% of methylene blue, which was obtained by 0.4SDS.

2

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