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 DOI 10.62749/ijactmat.v1i1.5