Electrochemical Sensing Techniques for Environmental and Biological Monitoring

Electrochemical sensing harnesses the interaction between target analytes and electrode surfaces to generate measurable electrical signals. At its core, this approach relies on redox reactions, surface-modified electrodes and advanced transducer architectures to detect a wide array of species ranging from environmental pollutants to vital biomolecules. Recent innovations centre on miniaturised and portable platforms, including screen-printed electrodes and lab-on-a-chip devices, which integrate nanostructured materials to enhance sensitivity, selectivity and reproducibility. Nanocomposites of metals, metal oxides and carbonaceous materials provide high electrocatalytic activity and extensive surface area, facilitating rapid charge transfer and low limits of detection. Techniques such as cyclic voltammetry and differential pulse voltammetry enable the quantification of analytes by mapping current–potential relationships, while coupling with enzymatic or molecular recognition elements allows for targeted biosensing. Such platforms find global significance in monitoring trace contaminants—heavy metals, pesticides, endocrine disruptors—and in clinical diagnostics through point-of-care detection of glucose, neurotransmitters and pharmaceutical residues. The convergence of materials science, microfabrication and electroanalytical methods continues to drive the field towards robust, field-deployable sensors that address pressing environmental and healthcare challenges.

Research from Nature Portfolio

Recent studies have demonstrated the power of hybrid nanostructures in biological sensing. One development involves a nickel oxide-doped platinum nanostructure embedded in a carbon paste electrode, yielding a highly electrocatalytic interface for the simultaneous determination of cysteamine and serotonin. This sensor exhibits ultralow nanomolar detection limits, linear responses across broad concentration windows and excellent resolution of overlapping signals, enabling reliable assays in pharmaceutical and serum samples. Another innovation employs a bimetallic platinum-cobalt alloy supported on reduced graphene oxide to create a composite biosensor for ascorbic acid, dopamine and uric acid. Microwave-assisted synthesis produces well-dispersed nanoparticles on graphene sheets, achieving distinct oxidation peaks, high sensitivity and low micromolar detection thresholds. These platforms underscore the versatility of metal-graphene hybrids and tailor-made electrocatalysts for simultaneous monitoring of key biological analytes with clinical relevance.

Electrochemical Sensing Techniques for Environmental and Biological Monitoring publication trend

The graph below shows the total number of articles in electrochemical sensing techniques for environmental and biological monitoring across all publications each year (not limited to Nature Index journals).

Technical terms

Electrochemical sensor: A device that converts a chemical reaction at an electrode surface into an electrical signal proportional to analyte concentration.

Screen-printed electrode: A miniaturised, disposable electrode fabricated by printing conductive inks onto rigid or flexible substrates.

Nanocomposite: A multi-component material in which nanoscale constituents (metals, oxides, carbon) enhance electrocatalytic or conductive properties.

Cyclic voltammetry (CV): A technique that records current as the potential applied to an electrode is cycled, revealing redox behaviour of species.

Differential pulse voltammetry (DPV): A sensitive voltammetric method that superimposes small potential pulses on a linear sweep to enhance signal resolution and lower detection limits.

Limit of detection (LOD): The lowest concentration of an analyte that produces a signal distinguishable from background noise.

References

1. A new nickel-based co-crystal complex electrocatalyst amplified by NiO dope Pt nanostructure hybrid; a highly sensitive approach for determination of cysteamine in the presence of serotonin. Scientific Reports (2020).
2. Composites of Bimetallic Platinum-Cobalt Alloy Nanoparticles and Reduced Graphene Oxide for Electrochemical Determination of Ascorbic Acid, Dopamine, and Uric Acid. Scientific Reports (2019).
3. Disposable Screen Printed Electrochemical Sensors: Tools for Environmental Monitoring. Sensors (2014).
4. Detection of nitrification inhibitor dicyandiamide: A direct electrochemical approach. Food Chemistry X (2023).
5. Electrochemical Enzyme Biosensor Bearing Biochar Nanoparticle as Signal Enhancer for Bisphenol A Detection in Water. Sensors (2019).