Label-free sensing Digital simulation 4 Membranes 4 Mesoporous membranes 4 4 nitrophenol 2 4-Nitrophenol 2 4-Nitrophenol reduction 2 Alumina 2 Alumina membranes 2 Amperometric response 2 Amperometric sensors 2 Amperometry 2 Biomolecule detection 2 Close distance 2 Computer simulation 2 Cyclic voltammetry 2 Electroactive species 2 Electrochemical systems 2 Gold Nanoparticles 2 Gold nanoparticles 2 Horse-radish peroxidase 2 Label free 2 Labels 2 Mass transport 2 Mathematical models 2 Membrane modification 2 Mesoporous materials 2 Mesoporous membrane 2 Mesoscopics 2 Metal nanoparticles 2