Journal
IEEE SENSORS JOURNAL
Volume 20, Issue 8, Pages 4047-4055Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2019.2963269
Keywords
Ammonia sensor; cross selectivity; OTFT; interdigitated channel; PBTTT-C14; selective ammonia sensor
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In the present work, we have developed a solution-processable poly (2,5-bis (3-tetradecylthiophen 2yl) thieno(3,2b) thiophene) (PBTTT-C14) based organic thin film transistor, for possible selective sensing the toxic ammonia (NH3) gas at 25 degrees C. This thin-film transistor based sensor makes use of PBTTT-C14 polymer as an organic channel that exhibits highly responsive (>61%) behavior at different levels of ammonia concentrations, even in presence of a mixture of ethanol and butanol gases in a humid environment. The notable changes are observed in the transistor parameters including channel mobility, threshold voltage and the on-off ratio. Interdigitated channels obtained using shadow masking technique enables the device to respond to a low ammonia concentration (<10 ppm). Better sensing capabilities with a detection limit of 2 ppm, the response time of 30 sec and recovery time of 40 sec of exposed ammonia, butanol and ethanol gases have been recorded. The mechanism of sensing has been explained for a better understanding of electrostatic and chemical interaction between gases and PBTTT-C14 semiconductor. Electrical characterizations of the device for the sensing were carried-out in the ambient condition. The device performance has been tested in humid environmental conditions. The fabricated device exhibited enormous potential for ammonia sensing for real-life applications.
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