Biosensors

Electrochemical biosensors translate biological recognition events into measurable current, potential, or impedance signals, giving researchers a fast, label-free window into enzymes, nucleic acids, antibodies, cells, and small-molecule metabolites. The discipline sits at the intersection of analytical electrochemistry, surface chemistry, and bioconjugation, and underpins point-of-care diagnostics, continuous glucose and lactate monitoring, environmental toxin detection, and emerging wearable and implantable platforms.

Researchers in this field rely on a compact set of core techniques: amperometry and chronoamperometry for enzyme-mediated assays, cyclic voltammetry for redox-probe characterization, differential pulse and square-wave voltammetry for trace-level detection, and electrochemical impedance spectroscopy for label-free affinity sensing on functionalized interfaces. Field-effect transistor biosensors and scanning electrochemical microscopy extend the toolkit toward single-cell and spatially resolved measurements.

Material families recur across the literature: noble-metal and screen-printed carbon electrodes as transducers; self-assembled monolayers of alkanethiols and silanes for ordered surface chemistry; conducting polymers such as polypyrrole, polyaniline, and PEDOT:PSS as signal amplifiers and immobilization matrices; carbon nanomaterials including graphene, reduced graphene oxide, and carbon nanotubes for high-surface-area transduction; and metal and metal-oxide nanoparticles as catalytic or electroactive labels. Bioreceptors span oxidoreductase enzymes, antibodies, aptamers, molecularly imprinted polymers, and engineered peptides, typically coupled to redox mediators such as ferrocene derivatives, ruthenium complexes, or methylene blue.

Supporting electrodes, redox probes, conducting polymers, carbon nanomaterials, and laboratory potentiostats used to build and characterize these biosensors are distributed across the rest of the catalog rather than collected here.