A Sensitive Material: New Polymer Enables Revolutionary CO₂–Sensors

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Elementar Analysensysteme GmbH

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Anton Paar GmbH

ETH Zürich

Exactly how the CO₂-dependant changes in conductivity were produced is not yet clear; however, the scientists have found indications that a chemical change induced by the presence of CO₂ occurs foremost at the interface between the nanoparticles and the polymers at the nanometre scale. “We think that CO2 effects the mobility of the charged particles in the material,” says Koziej.

Breathing Gauges for Scuba Divers

With the new sensor, scientists are able to measure CO₂ concentration over a wide range – from a concentration of 0.04 volume percent in the earth’s atmosphere to 0.25 volume percent.

Existing devices that can detect CO₂ measure the optical signal and capitalise on the fact that CO₂ absorbs infrared light. In comparison, researchers believe that with the new material much smaller, portable devices can be developed that will require less energy. According to Koziej, “portable devices to measure breathing air for scuba diving, extreme altitude mountaineering or medical applications are now conceivable”.

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