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Miniaturizing Sensor Active Areas to Enhance Analyte Surface Densities by Increasing "Effective" Analyte

Aruna Chandra Singh¹, D Balakrishnan¹, P Grysan¹

¹Luxembourg Institute of Science and Technology (LIST), 41, Rue du Brill, Belvaux L-4422, Luxembourg.

|April 13, 2026

Summary

Miniaturizing sensors enhances analyte surface density and signal intensity without changing solution concentration. Smaller sensor footprints increase effective analyte availability, maximizing benefits for micro- and nanoscale sensing applications.

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Area of Science:

Nanotechnology and Sensor Development
Surface Chemistry and Plasmonics

Background:

Miniaturization of sensors to micro- and nanoscale offers advantages like reduced space, sample volume, and faster response times.
Limited understanding exists on how reduced sensor active areas affect analyte-sensor interactions at constant analyte concentrations.

Purpose of the Study:

To investigate the impact of diminishing sensor active areas on analyte surface density and signal enhancement.
To rationalize the observed behavior by correlating reduced sensor dimensions with analyte-sensor interactions.

Main Methods:

Utilized gold nanoparticles as a model analyte for micro- and nanoscale sensor studies.
Correlated reduced sensor dimensions with changes in analyte surface density and effective analyte availability.
Analyzed signal enhancement in surface-enhanced Raman spectroscopy (SERS) based on nanoparticle surface density.

Main Results:

Demonstrated a nonlinear enhancement of analyte surface densities as sensor active areas diminished, independent of solution concentration.
Rationalized this enhancement by an increased effective analyte availability per surface site in smaller sensor footprints.
Observed enhanced signal intensities in SERS due to a higher density of plasmonic hotspots within the measurement footprint.

Conclusions:

Micro- and nanoscale sensors with active areas matching transducer measurement footprints maximize miniaturization benefits.
Reduced sensor footprints require fewer analyte molecules to achieve high surface densities, enhancing detection sensitivity.
This work provides critical insights for designing highly sensitive micro- and nanoscale sensing platforms.