Condensation reactions 1 Electrochemical biosensor 1 Electrochemical immunosensors 1 Electrodes 1 Functionalized 1 Human serum blood Hydrothermal methods 1 Immunosensors 1 Monoclonal antibodies 1 Nanocomposites 1 NiCoP/g-C3N4 nanocomposite 1 NiCoP/g-C3N4 nanocomposites 1 Procalcitonin 1 Sensitive detection 1 Synthesised 1 Ultrasensitive 1 Voltammetry 1 electrochemical immunosensor 1 human serum blood 1 procalcitonin 1