Water adsorption by a sensitive calibrated gold plasmonic nanosensor

Benjamin Demirdjian (1) , Frédéric Bedu (1) , Alain Ranguis (1) , Igor Ozerov (1) , Claude Henry (1)

1 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille

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, inter-disk 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.

Domaines: Chimie; Physique [physics]

Benjamin Demirdjian, Frédéric Bedu, Alain Ranguis, Igor Ozerov, Claude Henry. Water adsorption by a sensitive calibrated gold plasmonic nanosensor. Langmuir, 2018, 34, pp.5381-5385. ⟨10.1021/acs.langmuir.8b00040⟩. ⟨hal-01773221⟩