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A carbon nanotube based ammonia sensor on cotton textile
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Image of FIG. 1.
FIG. 1.

(a) CNT ink cartridges: empty, as-synthesized ink, and the ink after 1 month. The CNT is still well dispersed after 1 month. (b) Dyeing cotton yarn with CNT ink. A cotton thread is immersed in the CNT ink. After drying, the CNT-cotton yarn becomes conductive. (c) Resistance of CNT-cotton yarn for various bending conditions. As a result of strong hydrogen bonding between the CNT and cellulose, the CNT network shows high robustness to mechanical stress.

Image of FIG. 2.
FIG. 2.

(a) Resistance response to different NH concentrations. Different electrode-to-electrode distances from 0.1 to 0.4 in. were tested. The sensors were repeatedly exposed to NH for 3 min and dry air for 5 min. The baseline resistance is recovered after a desorption period. The resistance increases upon NH injection and decreases upon purging. (b) The normalized resistance response. Though the resistance values varies with the length, the normalized value are similar.

Image of FIG. 3.
FIG. 3.

(a) Schematic illustration of all CNT sensor fabrication. The metallic CNT were first coated on the cotton yarn followed by drop-casting of the sensing CNT at the center. (b) Photographic image of metallic CNT electrodes and the final sensor. (c) The resistance response for all metallic CNT sensors. No specific response was found. (d) The resistance response for metallic-sensing-metallic sensor.

Image of FIG. 4.
FIG. 4.

(a) Schematic illustration of e-textile knitted with CNN-cotton yarn. (b) Photo image of CNT-cotton yarn stitched on a garment. (c) The NH response for plane and bent garment. The influence of bending stress shows negligible effect on sensor response.


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Scitation: A carbon nanotube based ammonia sensor on cotton textile