Ahmad Radi Wan Yaakub
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Ahmad Radi Wan Yaakub
Official Name
Ahmad Radi, Wan Yaakub
Alternative Name
Wan Yaakub, Ahmad Radi
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Scopus Author ID
57221283601

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  • Publication
    Synthesis and characterization of reduced graphene oxide using the aqueous extract of Eclipta prostrata
    ( 2020-08-01)
    Chuah Regnant
    ;
    Subash Chandra Bose Gopinath
    ;
    Anbu P.
    ;
    Midhat Nabil Ahmad Salimi
    ;
    Ahmad Radi Wan Yaakub
    ;
    Lakshmipriya Thangavel
    In this study, biological deoxygenation of graphene oxide (GO) using an Eclipta prostrata phytoextract was performed via the infusion method. The presence of oxide groups on the surface of graphene and removal of oxides groups by reduction were characterized through morphological and structural analyses. Field emission scanning electron microscopy images revealed that the synthesized GO and rGO were smooth and morphologically sound. Transmission electron microscopy images showed rGO developing lattice fringes with smooth edges and transparent sheets. Atomic force microscopy images showed an increase in the surface roughness of graphite oxide (14.29 nm) compared with that of graphite (1.784 nm) due to the presence of oxide groups after oxidation, and the restoration of surface roughness to 2.051 nm upon reduction. Energy dispersive X-ray analysis indicated a difference in the carbon/oxygen ratio between GO (1.90) and rGO (2.70). Fourier-transform infrared spectroscopy spectrum revealed peak stretches at 1029, 1388, 1578, and 1630 cm−1 for GO, and a decrease in the peak intensity after reduction that confirmed the removal of oxide groups. X-ray photoelectron microscopy also showed a decrease in the intensity of oxygen peak after reduction. In addition, thermogravimetric analysis suggested that rGO was less thermally stable than graphite, graphite oxide, and GO, with rGO decomposing after heating at temperatures ranging from room temperature to 600 Â°C.
      3  13
  • Publication
    Characterization and anti-bacterial potential of iron oxide nanoparticle processed eco-friendly by plant extract
    ( 2020-11-02)
    Yan, Leong Poh
    ;
    Subash Chandra Bose Gopinath
    ;
    Anbu P.
    ;
    Farizul Hafiz Kasim
    ;
    Hanna Ilyani Zulhaimi
    ;
    Ahmad Radi Wan Yaakub
    This research comprehends iron-oxide nanoparticle (IONP) production, the apparent metallic nanostructure with unique superparamagnetic properties. Durian-rind-extract was utilized to synthesize IONP and the color of reaction mixture becomes dark brown, indicated the formation of IONPs and the peak was observed at ∼330 nm under UV-visible spectroscopy. The morphological observation under high-resolution microscopies has revealed the spherical shape and the average size (∼10 nm) of IONP. The further support was rendered by EDX-analysis showing apparent iron and oxygen peaks. XRD results displayed the crystalline planes with (110) and (300) planes at 2θ of 35.73° and 63.53°, respectively. XPS-data has clearly demonstrated the presence of Fe2P and O1s peaks. The IONPs were successfully capped by the polyphenol compounds from durian-rind-extract as evidenced by the representative peaks between 1633 and 595 cm−1 from FTIR analysis. The antimicrobial potentials of IONPs were evidenced by the disk-diffusion assay. The obtained results have abundant attention and being actively explored owing to their beneficial applications.
      16  36