Nanoparticle-Based Biosensing Techniques for Biomedical Applications

Nanoparticle-based biosensing has emerged as a versatile platform for the rapid, sensitive and multiplexed detection of biomolecules and pathogens. Metallic nanoparticles, most notably gold and silver, exploit unique plasmonic properties to transduce binding events into measurable optical or thermal signals. Surface functionalisation with antibodies, peptides or nucleic acids confers specificity, while the high surface-to-volume ratio of nanoscale constructs enhances signal amplification. Detection modalities include localized surface plasmon resonance shifts, surface-enhanced Raman scattering, photothermal heat generation and electrochemical read-outs. Recent advances have delivered one-step assays, digital counting of single particles and modular assembly strategies, enabling point-of-care diagnostics, viral load monitoring and early cancer biomarker screening with limits of detection at single-molecule levels.

Research from Nature Portfolio

Studies using ultra-sensitive thermal detectors have quantified the photothermal conversion efficiency of individual silver nanoparticles, revealing femtowatt-scale heat dissipation and informing the design of next-generation plasmonic sensors. Separately, a digital plasmonic nanobubble detection platform harnesses gold nanoparticles to generate transient vapour bubbles upon pulsed laser excitation, achieving compartment-free single-particle counting of intact viruses in clinical specimens. This approach combines homogeneous immunoassays with direct optical read-out, delivering rapid, amplification-free detection of respiratory pathogens at clinically relevant titres.

Research from all publishers

A peptide-directed self-assembly strategy has produced hierarchical silver fractal biomaterials with controllable interparticle spacing and morphology, yielding enhanced collective plasmonic responses for colourimetric and photothermal sensing. Precise modulation of peptide sequence and concentration tunes nanoscale aggregation, offering a route to robust point-of-care assays. In parallel, systematic comparisons of antibody–gold nanoparticle conjugation methods have guided the optimisation of lateral flow tests for small-molecule detection, highlighting how orientation, linker chemistry and surface density influence assay sensitivity and reproducibility in real-world samples.

Nanoparticle-Based Biosensing Techniques for Biomedical Applications publication trend

The graph below shows the total number of articles in nanoparticle-based biosensing techniques for biomedical applications across all publications each year (not limited to Nature Index journals).

Technical terms

Nanoparticle: A particle with at least one dimension between 1 and 100 nm, exhibiting size-dependent physical and chemical properties.

Localized surface plasmon resonance (LSPR): Resonant oscillation of conduction electrons in metallic nanoparticles induced by incident light, sensitive to local refractive index changes upon analyte binding.

Surface-enhanced Raman spectroscopy (SERS): Enhancement of Raman scattering signals by molecules adsorbed on rough metal surfaces or nanoparticles, enabling trace-level detection.

Photothermal effect: Conversion of absorbed light into heat by plasmonic nanoparticles, used for thermal sensing or therapy.

Bioconjugation: Chemical or physical coupling of biomolecules (antibodies, peptides, nucleic acids) to nanoparticle surfaces to confer specificity.

Plasmonic nanobubble detection: Technique in which pulsed laser heating of plasmonic nanoparticles generates transient vapour bubbles, enabling digital counting of individual targets.

References

1. Mechanism of hierarchical plasmonic biomaterials engineered through peptide‐directed self‐assembly. Aggregate (2024).
2. The collective photothermal effect of silver nanoparticles probed by a microbolometer. Communications Materials (2024).
3. Digital plasmonic nanobubble detection for rapid and ultrasensitive virus diagnostics. Nature Communications (2022).
4. Tools to compare antibody gold nanoparticle conjugates for a small molecule immunoassay. Microchimica Acta (2023).