Surface Plasmon Resonance Sensor Based on Polypyrrole-Chitosan-BaFe2O4 Nanocomposite Layer to Detect the Sugar

The surface plasmon resonance sensor was used to detect and measure low concentrations of sugar. A polypyrrole-chitosan-BaFe2O4 nanocomposite layer was prepared to improve the surface of the gold layer for the detection of glucose, fructose, and sucrose using the surface plasmon resonance technique. The polypyrrole-chitosan-BaFe2O4 was synthesized using the electrodeposition method in different thicknesses. The functional group, crystal structure, and morphology of the layer were investigated with Fourier transform infrared spectroscopy, X-ray diffraction technique, and field emission electron microscopy. Consequently, the BaFe2O4 was scattered on the surface of the polymer, and the affinity of polypyrrole-chitosan-BaFe2O4 to bond with glucose is higher than that for the other sugars. The sensor limit was 0.005 ppm.