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All Journal International Journal of Acta Material
S. Misudo
Division of Engineering Applied Physics, Faculty of Engineering, University of Fukui 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan.
Chemistry Materials Science & Nanotechnology Physics

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The Effect of Doping Concentration in the Work Electrodes of Graphene-MnxOy and Test on Glucose by Cyclic Voltametry L Agusu; T. Azis; Imran; Fitrianti; A. T. Nurwahida; S. Misudo; Alimin
International Journal of Acta Material Vol. 1 No. 1 (2024): August 2024
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i1.5

Abstract

A study was conducted to investigate the impact of concentration on the graphene-manganese oxide (EPG/MnxOy) working electrode for glucose analysis using the cyclic voltammetry method. To characterize the electrode material, SEM-EDX, FTIR, and XRD analyses were performed. The results revealed that the graphene surface contained aggregates in the form of small particles attached to the graphene. Various absorption bands corresponding to aliphatic -O-H, -C-H, -C=C aromatic, -C=O, -C=C, -C-O, and Mn-O groups were identified in the graphene and graphene/MnxOy materials. Crystal patterns of manganese oxide were also identified at angles 2q = 30.57o and 44.39o, representing the Mn3O4 crystal pattern, at the angle 2q=34.12o denoting the MnO2 crystal pattern, and at angles 2q= 39.85o, 57.85o, and 68.94o representing the MnO crystal patterns. The optimal electrode composition was found to be graphene:MnxOy 0.8:0.5, as indicated by an anodic peak current (Ipa) of 122 µA at a potential of -0.11 V. The most effective supporting electrolyte was determined to be NaNO3, with an anodic peak current (Ipa) of 26.4 µA at a potential of -0.13 V. The detection limit for glucose was 4.45×10-3 M. The repeatability test of EPG/MnxOy yielded a result of 1.77%.
Effect of pH and Stirring Speed on the γ-Fe2O3 Material Properties Synthesized from Iron Sand by Using Co-Precipitation Method L Agusu; Amiruddin; M. Nalis; S. Misudo; Y. Fujii; Y. Ishikawa; Alimin
International Journal of Acta Material Vol. 1 No. 1 (2024): August 2024
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i1.6

Abstract

Research has been conducted to investigate the impact of pH and stirring on the magnetic properties of γ-Fe2O3 nanoparticles derived from iron sand using the co-precipitation method. The objective of this study was to synthesize γ-Fe2O3 nanoparticles and examine how pH and stirring affect their size and properties. The co-precipitation method involved mixing iron sand with HCl as a solvent and NH4OH as a precipitator. The experimental setup included variations in pH, specifically pH 10 and pH 12, as well as stirring speeds of 600 rpm and 700 rpm. The synthesized maghemite nanoparticles were characterized using XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), and VSM (Vibrating Sample Magnetometer) techniques. XRD analysis revealed that the particle size at 600 rpm under pH 10 was 52.085 nm, whereas at 700 rpm under pH 12 it was 47.821 nm. The VSM characterization results demonstrated a remanent magnetization of 25.5 emu/gr, a coercivity field of -0.01 Tesla, and a saturation magnetization of 52.45 emu/gr. This study confirmed that the maghemite nanoparticles produced exhibited ferromagnetic properties.
Co-Authors A. T. Nurwahida Alimin Alimin Amiruddin Fitrianti Imran L Agusu L Agusu M. Nalis T. Azis Y. Fujii Y. Ishikawa