Detection sensitivity Probes 4 Amine functional groups 2 Antibodies 2 Antibody-antigen interactions 2 Antigen-antibody binding 2 Antigens 2 Biomolecules 2 Biosensors 2 Body fluids 2 Bovine serum albumins 2 Cell-to-cell variation 2 DNA 2 DNA hybridization 2 DNA molecules 2 DNA sensing 2 Deep reactive ion etching 2 Electrodes 2 Electrospray ionization 2 Experiments 2 Fiberoptic probes 2 Flavonoids 2 Fruits 2 Functional groups 2 Grating structures 2 Grating surface 2 High spatial resolution 2 Human serum albumins 2 Internal electrodes 2 Ionization 2