MODIFICATION OF COBALT-METAL ORGANIC FRAMEWORK (Co-MOF) WITH GRAPHENE (Gr) BY SOLVOTHERMAL METHOD AS NON-ENZYMATIC GLUCOSE SENSOR

• Main Author: Yuniasari, Rizki
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43482
• Institution: Institut Teknologi Bandung

Early detection is an important step in the spread of disease. Sensor offers a more simple, fast and accurate disease detection method compared to the conventional laboratory methods that are commonly performed. In this study, Cobalt-Metal Organic Framework (Co-MOF) was composited with graphene and used as a sensor for detecting diabetes with electrochemical principles. The selection of Co-MOF material based on its porous nature, large surface area, and good electrochemical properties. Graphene is used for its high conductivity to increase the electrochemical sensor current. Co-MOF & Co-MOF had been successfully synthesized by solvothermal method with the concentration of graphene varied as 1% &, 3%, and 5% wt. Co(NO3)2.6H2O and Benzene-1,4-dicarboxylic acid (BDC) were used as precursors to make Co-MOF particles. The resulting composite had good crystallinity with graphene particles attached to the Co-MOF surface. The greater the concentration of graphene, the Co-MOF XRD diffraction peak appears to decrease. Electrochemical properties were tested by cyclic voltammetry (CV) with 0.1M NaOH solution as the supporting electrolyte. The measurement indicated that the materials could be good electron transfer media between the electrode surface and electrolyte solution. This could be seen from the step of the oxidation and reduction current. The results of the samples with the best electrochemical properties were obtained by the Co-MOF/Gr3% sample. This sample was able to increase oxidation and reduction up to 396.74% and 648.65% with the lowest detection limit 5.39 ?M. The selectivity test of Co-MOF sensor was done by comparing the response with other compounds such as uric acid, dopamine, and NaCl. The sensor had a good stability with 93% of the response after 1 month of storage.