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Updated: Feb 11, 2026

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Water Adsorption by a Sensitive Calibrated Gold Plasmonic Nanosensor
Benjamin Demirdjian1, Frédéric Bedu1, Alain Ranguis1
1Aix Marseille Univ, CNRS, CINAM , Marseille , France.
Abstract:
We demonstrate in this work that using nanoplasmonic sensing it is possible to follow the adsorption/desorption of water molecules on gold nanodisks nanofabricated by electron beam lithography. This quantitative method is highly sensitive allowing the detection of a few hundredths of adsorbed monolayer. Disk parameters (height, diameter, and interdisk distance) have been optimized after finite-difference time-domain (FDTD) simulations in order to obtain the best localized surface plasmon resonance (LSPR) signal-to-noise ratio. Finally, we have precisely measured the adsorption kinetics of water on gold as a function of the relative humidity of the surrounding medium.
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