Journal
IEEE ELECTRON DEVICE LETTERS
Volume 38, Issue 7, Pages 975-978Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2017.2701879
Keywords
Ammonia sensor; silver nanowire; PEDOT:PSS; composite film; meat freshness monitoring
Categories
Funding
- NSFC of China [61334008, 61274083]
- National Key Research and Development Program of Strategic Advanced Electronic Materials [2016YFB0401100]
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Flexible ammonia (NH3) sensors were fabricated on polyethylene terephthalate substrate using poly(3, 4-ethylene-dioxythiophene): poly(styrenesulfonate) (PEDOT:PSS)/silver nanowire (AgNW) composite film as the active layer. With the AgNWs of optimized concentration being incorporated into the PEDOT:PSS film, the sensitivity of the devices was significantly improved. Even with simple digitally dispensed parallel structure electrodes, the device achieved excellent sensing performance, and was shown to be able to detect very low NH3 concentration below 500 ppb. The mechanism for the sensing performance improvement was revealed. The sensor also showed considerable selectivity with respect to water and common organic vapors. Finally, the sensor was integrated with a self-designed portable data acquisition system to monitor the freshness of pork, demonstrating its feasibility for inspecting the meat quality in the early stage.
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