Journal
POLYMERS
Volume 12, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/polym12010128
Keywords
polymer blend; tris(pentafluorophenyl)borane; poly(3-hexylthiophene); organic field-effect transistor; chemical sensor; Lewis acid; doping and dedoping
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Funding
- Cooperative Research Program for Agriculture Science and Technology Development, Rural Development Administration, Republic of Korea [PJ01281001]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2019R1A2C1087234]
- National Research Foundation of Korea [2019R1A2C1087234] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Here, we fabricate ammonia sensors based on organic transistors by using poly(3-hexylthiophene) (P3HT) blended with tris(pentafluorophenyl)borane (TPFB) as an active layer. As TPFB is an efficient p-type dopant for P3HT, the current level of the blend films can be easily modulated by controlling the blend ratio. The devices exhibit significantly increased on-state and off-state current levels owing to the ohmic current originated from the large number of charge carriers when the active polymer layer contains TPFB with concentrations up to 20 wt % (P3HT:TPFB = 8:2). The current is decreased at 40 wt % of TPFB (P3HT:TPFB = 6:4). The P3HT:TPFB blend with a weight ratio of 9:1 exhibits the highest sensing performances for various concentrations of ammonia. The device exhibits an increased percentage current response compared to that of a pristine P3HT device. The current response of the P3HT:TPFB (9:1) device at 100 ppm of ammonia is as high as 65.8%, 3.2 times that of the pristine P3HT (20.3%). Furthermore, the sensor based on the blend exhibits a remarkable selectivity to ammonia with respect to acetone, methanol, and dichloromethane, owing to the strong interaction between the Lewis acid (TPFB) and Lewis base (ammonia).
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