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====TWIGS: Textiles With Integrated Gas Sensors====

{{image url="http://www.nano-tera.ch/images/uploads/308/textile_sensor.jpg" title="text" alt="text"}}

Electronic textiles have a wide range of potential applications in wearable computing and large-area applications, including medical monitoring, assistance to the disabled, and distributed sensor networks. The spectrum of e-textiles ranges from wearable electronics attached to textile substrates to electronic components integrated directly with the textile yarn. This introduction of electronics at the yarn level is considered to be the next step in the evolution of e-textiles and brings electronic-textile integration below the device-level.

The goal of the NanoTera TecInTex RTD project is to improve on the state-of-the art woven etextiles by fabricating thin-film temperature sensors and pressure sensors on plastic substrates, separating devices by cutting device-strips that have sub-mm widths, and weaving a true e-textile using a commercial weaving machine. In contrast to the TecInTex project, the TWIGS NTF project will focus on integrating capacitive chemical gas sensors (Humidity and Volatile Organic Compounds) with optimized flexible electrodes into textiles. This project will combine available gas-sensing technology at EPFL with processing and stripe weaving experience available from ETH and printing know-how from CSEM to achieve a new type of woven gas sensor.

To demonstrate a potential application, we will build a simple large-area textile air-filter. This demonstrator will be achieved by (1) fabricating VOC, temperature sensors (from the TecInTex project) and humidity sensors on plastic foils, (2) cutting the substrate into strips using the method developed at ETH and (3) weaving the sensors into a textile with a surface area of 0.25m x 1m. The VOC sensors will exhibit response to low ppm levels of VOCs (total VOC content), temperature sensors will have a temperature coefficient of resistance (TCR) of 223m./K, and humidity sensors will have a linear response to humidity (10 to 90 RH%, /- 5% accuracy) and response times in the range of a few minutes. The integration of humidity and VOC sensors into air filters will allow air-control systems to detect air quality in the surrounding environment and take corrective action. Such action could include turning on a humidifier if the air is too dry, or turning on a fan if the percentage VOCs in the air is too high. Intelligent air filters can be built into aircontrol systems in buildings or cars, and could easily be integrated into state-of-the art high-performance textile filters such as those fabricated by the Swiss Textile company, Sefar.
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