The Effect of Doping Concentration in the Work Electrodes of Graphene-MnxOy and Test on Glucose by Cyclic Voltametry

L Agusu (Department of Physic, Faculty of Mathematics and Natural Sciences, Halu Oleo University, Kampus Hijau Bumi Tridharma, Anduonohu, Kendari, Sulawesi Tenggara 93232, Indonesia)
T. Azis (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Halu Oleo University, Kampus Hijau Bumi Tridharma, Anduonohu, Kendari, Sulawesi Tenggara 93232, Indonesia)
Imran (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Halu Oleo University, Kampus Hijau Bumi Tridharma, Anduonohu, Kendari, Sulawesi Tenggara 93232, Indonesia)
Fitrianti (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Halu Oleo University, Kampus Hijau Bumi Tridharma, Anduonohu, Kendari, Sulawesi Tenggara 93232, Indonesia)
A. T. Nurwahida (Department of Pharmacy, Bani Saleh University, Jalan Mayor M. Hasibuan No 68. Bekasi Timur 17113, Jawa Barat, Indonesia)
S. Misudo (Division of Engineering Applied Physics, Faculty of Engineering, University of Fukui 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan.)
Alimin (Division of Engineering Applied Physics, Faculty of Engineering, University of Fukui 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan.)

International Journal of Acta Material
Vol. 1 No. 1 (2024): August 2024

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%.