We present the flexible bilayer film polycarbonate/polycrystalline organic molecular conductor as a promising material for humidity sensors which may be applied in a number of monitoring scenarios. The film is capable of monitoring air relative humidity levels from 15 up to 90 % as a well definite reproducible electrical signal.

On the Sensing Mechanisms of a Hydroresistive Flexible Film Based on an Organic Molecular Metal
Raphael Pfattner, Elena Laukhina, Laura Ferlauto, Fabiola Liscio, Silvia Milita, Anna Crespi, Victor Lebedev, Marta Mas-Torrent. Vladimir Laukhin, Concepció Rovira, Jaume Veciana
ACS Appl. Electron. Mater. 1, 9, 1781–1791, 2019
DOI: 10.1021/acsaelm.9b00322

Figure: Schematic illustration of reversible water uptake shown on top of SEM image taken from the cross section of a bilayer film. Insets: Electronic and structural phase transition of bilayer film with [(BEDT-TTF)5(Br4(H5O2))] as hydroresistive organic molecular metal.

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