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New sensors for relative humidity

A new, flexible lightweight bilayer film is presented and structurally characterized as a promising material for humidity sensing. Pfattner R. et al., ACS Appl. Electron. Mater., Vol. 1 - 9, pp. 1781-1791 (2019)

Relative humidity (RH) is one of the most frequently controlled parameters in science and technology, and the need of light weight, flexibile, low cost, and fast sensors, capable of fully reversible RH responses is strongly increasing. The humidity testing of a new bilayer film showed that it is capable of monitoring relative humidity (RH) levels from 15 up to 90% with a well-defined and reproducible electrical signal. The structural response of the bilayer film to variations of RH clearly demonstrated that crystallite interlayer spacing (d) of phase I is strongly affected, exhibiting a reversible metal–nonmetal transition, while phase II was insensitive to humidity. An overview of mechanical and humidity sensing properties

of the developed bilayer film corroborates that it can be used as flexible hygrometer as well as moisture sensing units on board of low-cost electronic sensing devices. Retrieve Article On the Sensing Mechanisms of a Hydroresistive Flexible Film Based on an Organic Molecular Metal Pfattner R., Laukhina E., Ferlauto L., Liscio F., Milita S., Crespi A., Lebedev V., Mas-Torrent M., Laukhin V., Rovira , Veciana J. ACS Appl. Electron. Mater., Vol. 1 - 9, pp. 1781-1791 (2019) DOI: 10.1021/acsaelm.9b00322