polypyrrole-graphene quantum dots nanocomposite layer for ‎detection of uric acid using plasmonic sensor

A polypyrrole-graphene quantum dots nanocomposite layer was prepared on the surface of ‎the gold layer for detection of the uric acid using the surface plasmon resonance technique. ‎the x-ray diffraction spectrum and the field emission scanning electron microscopy image for ‎polypyrrole-graphene quantum dots layer confirmed the graphene quantum dots scattered on ‎the surface of the polymer and the nanocomposite layer formed on the surface of thin gold ‎layer in the thickness of 13.3 nm. the minimum concentration of uric acid that was detected ‎by the sensing layer was about 1 ppm and the affinity constant of polypyrrole-graphene ‎quantum dots for detection of uric acid was larger than the affinity constant for detection of ‎ascorbic acid and glucose. the response of the polypyrrole-graphene quantum dots is larger ‎than the response of polypyrrole for the detection of uric acid.‎