A novel NH3 sensor by using printing technology is proposed.The preparation of ink and the effect of the ratio of acid in polymer to NH3 sensor have been discussed.In order to improve the sensitivity
DC/AC impedance changes with the NH3 concentration is examined and it shows that sensitivity of the sensor is about one order higher than DC impedance at 1.5kHz AC impedance.Additionally
an equivalent circuit model is developed to explain AC impedance spectrum.Owing to the low-cost
high volume production process and producible onto a flexible substrate
NH3 sensor based on polymer by using printing technology has a promising prospect in food processing
aquaculture and medical industry
etc.
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references
Ammonia sensitivity of polyaniline films via emulsion polymerization [J] . Shuizhu Wu,Fang Zeng,Fengxian Li,Yinlan Zhu. European Polymer Journal . 2000 (4)