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Fabrication of AuNP arrays: (A) inkjet printing of the AuNP ink onto the polyimide substrate; (B) inkjet printing the poly(amic acid) ink to insulate the electrode leads; (C) building the immunoassay for electrochemical detection of human IL-6; (D) the AuNP pattern (black) shown overlaid with the poly(amic acid) printed pattern (orange).
