The Effect of Addition Fe3O4 on the rGO/Fe3O4 Composite on Glucose Biosensor Performance

Abstract

The development of composites as biosensors is very broad, one of them is biosensors to absorb glucose. Composite materials characteristic as biosensors must fulfill the criteria including nanomaterials that have magnetic properties, electrical conductivity, and good catalytic properties. One of the composites that fulfill those criteria is rGO/Fe3O4. By varying the addition of Fe3O4 in the making of rGO/Fe3O4 composites, the composition of composites that have the most effective performance in absorbing glucose will be known. The variation of Fe3O4 addition in this study is 0.1 gram - 0.5 gram, with 0.5 gram of RGO. The characteristics of rGO, Fe3O4 and the rGO/Fe3O4 composite are known by the XRD and FTIR analysed based on relevant previous studies. Glucose biosensor absorbance was tested by UV-Vis, a composite with mass variations of Fe3O4 0.1 gram, 0.2 gram, 0.3 gram, 0.4 gram, and 0.5 gram. Peak absorption of the composite of 0.1 gram Fe3O4 shows high glucose concentration, it can be seen that the composite does not absorb glucose properly. The 0.2 gram composite has the lowest absorption peak so that this composite is the best biosensor. Because with the addition of Fe3O4 mass shows the peak absorption is also higher. So, composites have a maximum limit in absorbing glucose.