Muhammad Asri Idris
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Preferred name
Muhammad Asri Idris
Official Name
Muhammad Asri , Idris
Alternative Name
Idris, Muhammad Asri
Idris, M. A.
Idris, M. Asri
Asri Idris, Muhammad
in Idris, Muhammad Asri
Main Affiliation
Scopus Author ID
24802030700
Researcher ID
N-1142-2017

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  • Publication
    The hydrothermal synthesis of TiOâ‚‚-GO with enhance photocatalytic activity
    ( 2024-12)
    Noor Azira Mohd Noor
    ;
    Muhammad Asri Idris
    ;
    Murizam Darus
    ;
    Nur Farhana Diyana Mohd Yunos
    A composite material consisting of titanium dioxide and graphene oxide (TiO₂–GO) was synthesized through a hydrothermal reaction. This reaction involved the use of Ti(SO4)2 in an ethanol–water solvent. Different content of GO was studied to find the optimum parameter. The composites were subjected to characterization, encompassing an examination of their composition, structure, and microstructure through techniques such as X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), and ultraviolet-visible diffuse reflectance spectroscopy. For Raman spectra, the presence of a G-band at approximately 1599 cm-1 and a D-band at 1350 cm-1 in the spectra indicates the presence of graphene oxide (GO). Therefore, the modified Hummer method synthesized graphite to GO. The findings for the XRD spectrum concerning the TiO2–GO composites revealed the presence of finely dispersed anatase TiO₂ particles on the surface of the graphene oxide sheet layer. Diffraction pattern similar to pristine TiO₂, only for TiO2–GO(0.75) and the peak for rutile TiO2 at 2Ɵ values 27.08° for both technique and TiO₂–GO(0.5) for spray technique. Apparently, GO sheets were almost covered by anchored TiO₂ particles, providing the possibility of efficient electronic conducting and electron transportation as in the SEM microstructures. EDS analysis shows the excessive carbon element for TiO₂-GO(0.75) and TiO₂-GO(1). The findings concerning the TiO₂–GO composites revealed the presence of finely dispersed anatase TiO₂ particles on the surface of the graphene oxide sheet layer. Notably, the photocatalytic performance of the TiO₂–GO composite significantly surpassed that of pure TiO₂ in the photodegradation of methyl blue (MB) when exposed to sunlight. The spray technique had a higher photocatalytic degradation percentage which is 82% for TiO₂-GO(0.25) compared to the dropped technique 79% which is TiO₂-GO(0.5). Degradation analysis of methyl blue concluded that the improved photocatalytic activity of TiO₂–GO primarily results from the enhanced efficiency in trapping and transporting electrons, which can be attributed to the presence of graphene oxide (GO).
  • Publication
    Analysis of particle size and XRD in ZnO-based varistor
    (Universiti Malaysia Perlis (UniMAP), 2010-09-06)
    Noor Azira Mohd Noor
    ;
    Mohabattul Zaman S NS Bukhari
    ;
    Muhammad Asri Idris
    ;
    Noor Mariamadzliza Mohd Nan
    ZnO varistors doped with Bi₂O₃, Sb₂O₃, CoO, MnO₂ and Cr₂O₃ were prepared separately by two mixing processes: conventional and masterbatching mixed-oxide process method. After the mixing process, the ZnO-based varistor powders were milled using planetary ball mill at 200, 300, 400 and 500 rpm. Particle size analysis and XRD analysis were used to study the differences after milling process in ZnO-based varistor powder. The particle sizes of varistor powder were reduced and new compound encountered after milling process.
      5  1
  • Publication
    Preliminary Study of Hydrothermal Synthesis of TiO2-GO Composites as a High Performance Photocatalyst
    ( 2020-11-24)
    Noor Azira Mohd Noor
    ;
    Murizam Darus
    ;
    Dewi Suriyani Che Halin
    ;
    Muhammad Asri Idris
    ;
    Yunos N.F.M.
    In this study, the addition of graphene oxide (GO) into TiO2 was investigated. GO was prepared by modified Hummer method before it was added into TiO2 via hydrothermal method. The graphite and GO was characterized by Raman spectra, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM) along with the TiO2-GO composites also have been characterized. The morphology of TiO2 deposited on the surface of the GO sheet was observed by SEM. the phase formation of anisotropic anatase (TiO2) of the TiO2-GO was detected in XRD. The photocatalytic activity was determined by calculating the photodegradation efficiency of methylene blue (MB) under UV light irradiation. The photodegradation of MB were increased with time for TiO2-GO compared to pure TiO2. The results indicated that TiO2-GO composites was successfully produced using hydrothermal method for the photocatalytic application.
      5  27
  • Publication
    Near surface studies on the role of graphene oxide in the carbon species activities in it-sofc cathode materials
    ( 2020-01-01)
    Murizam Darus
    ;
    Noor Azira Mohd Noor
    ;
    Muhammad Asri Idris
    ;
    Nur Farhana Diyana Mohd Yunos
    Active roles of carbon species in solid oxide fuel cell (SOFC) cathode was simulated by adding graphene oxide (GO) into Ba0.5Sr0.5Co0.2Fe0.8 (BSCF) materials prepared by sol-gel method. The mixture was heated up to intermediate temperature SOFC range (650 – 850 °C) for a period of 5 hours. A depth-profiling measurement by x-ray photoelectron spectroscopy (XPS) technique was carried out to analyse the carbon species activities at near surface of BSCF cathode. A depth-profiling analysis indicated that the GO bond components are retained under the cathode surface and does not affected the formation of carbonate phases in BSCF cathode.
      4  25