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Ultrasensitive Piezoresistive All-Organic Flexible Thin Films

Elena Laukhina, Raphael Pfattner, Lourdes R. Ferreras, Marta Mas-Torrent, Vladimir Laukhin, Concepció Rovira, Jaume Veciana, Weinheim (2009)

The development of intelligent materials that can respond to the application of an external stimulus is of major interest for the fabrication of artificial sensing devices able to sense and transmit information about the physical, chemical and/or biological changes produced in our environment. In addition, if these materials can be deposited or integrated on flexible and transparent substrates and processed employing low-cost techniques their appeal is greatly increased. In this context, organic materials, which have already shown a huge potential in a wide range of (opto)-electronic applications, can play a crucial role. Here, we show that composite bi-layer (BL) films, composed of a polymeric matrix with a toplayer formed by a nano- or microcrystalline network of a conducting charge transfer salt, are extremely sensitive to strain changes and exhibit fast and completely reversible responses. Such BL films have a sensitivity one order of magnitude larger than the most commonly used manganese-based electromechanical sensors. In addition, a few proof-of-concept experiments with simple prototypes are also reported demonstrating that these flexible, low-weight, and transparent composites are very attractive as a new generation of durable and low-cost all-organic strain sensors being highly promising for a wide range of applications.

Partners : CSIC

Place of Publication : Weinheim

Date of Publication : 2009/12/21

Additional Data : Adv. Mater. 2009, 21, 1–5

Link to the online version of the article.