Electrochemical Glucose Biosensing with Zinc Oxide Nanostructures

Electrochemical glucose biosensors based on zinc oxide (ZnO) nanostructures have attracted considerable attention due to ZnO’s unique physicochemical properties, including a wide bandgap, high exciton binding energy and biocompatibility. By synthesising ZnO into one-, two- and three-dimensional nanostructures—such as nanorods, nanowires, nanosheets and hollow nanoflowers—researchers achieve large accessible surface areas and enhanced electron transport pathways. Enzymatic sensors typically immobilise glucose oxidase onto ZnO scaffolds to catalyse glucose oxidation, converting biochemical turnover into an amperometric signal with high specificity. Non-enzymatic approaches exploit the intrinsic electrocatalytic activity of ZnO or its hybrids with other metal oxides to oxidise glucose directly, thereby offering advantages in stability and cost. Careful control of morphology, surface chemistry and interface engineering can optimise sensitivity, linear dynamic range and limit of detection. These sensors are increasingly integrated into flexible substrates and wearable formats, addressing global needs for point-of-care diabetes monitoring, food safety and environmental analysis.

Research from Nature Portfolio

Recent studies have explored advanced ZnO architectures for both enzymatic and non-enzymatic glucose sensing. Hydrothermally grown ZnO nanorod arrays on conductive substrates, with glucose oxidase immobilised by physical adsorption and Nafion encapsulation, have realised a linear glucose response from micromolar to millimolar concentrations, low Michaelis–Menten constants and strong resistance to common interferents in blood. Hybrid metal-oxide microstructures comprising dumbbell-shaped, double-shelled CuO/ZnO exhibited a remarkably wide dynamic range (nanomolar to tens of millimolar), rapid response times under two seconds and high sensitivity exceeding 1,500 µA mM⁻¹ cm⁻². Complementary work on ZnO–graphene heterostructures demonstrated direct electron transfer between glucose oxidase and electrode, yielding sensitivity improvements and rapid charge-transfer kinetics without redox mediators.

Electrochemical Glucose Biosensing with Zinc Oxide Nanostructures publication trend

The graph below shows the total number of articles in electrochemical glucose biosensing with zinc oxide nanostructures across all publications each year (not limited to Nature Index journals).

Technical terms

Electrochemical biosensor: A device that converts a biological reaction into an electrical signal via electrochemical transduction.

Enzyme immobilisation: The attachment of enzymes to a solid support to maintain biological activity and stability within a sensor architecture.

Non-enzymatic sensor: A sensing platform that detects analytes via direct electrocatalytic oxidation at the electrode surface without biological enzymes.

Direct electron transfer: The process by which electrons move directly between a redox‐active biomolecule and an electrode interface, bypassing mediators.

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

References

1. Fabrication and Characterization of Glucose Biosensors by Using Hydrothermally Grown ZnO Nanorods. Scientific Reports (2018).
2. Highly sensitive non-enzymatic electrochemical glucose sensor based on dumbbell-shaped double-shelled hollow nanoporous CuO/ZnO microstructures. Scientific Reports (2021).
3. ZnO-nanorods/graphene heterostructure: a direct electron transfer glucose biosensor. Scientific Reports (2016).
4. A dual-functional flexible sensor based on defects-free Co-doped ZnO nanorods decorated with CoO clusters towards pH and glucose monitoring of fruit juices and human fluids. Nano Convergence (2022).
5. Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing. Molecules (2021).