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Water adsorption by a sensitive calibrated gold plasmonic nanosensor

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

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