The Effect of Poly(3-alkylthiophene) Side Chain Length on Gas Sensing Performance and Mechanical Property
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초록
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Semiconductive conjugated polymers have gained widespread popularity in the realm of organic transistor gas sensor devices, attributed to their ease of preparation and inherent flexibility. Among these polymers, poly(3-alkylthiophene) (P3AT) stands out due to its distinctive molecular structure that incorporates a π-electron system, promoting charge carrier mobility and imparting exceptional electrical conductivity. This study presents a comprehensive comparison of the gas sensing performance for various gases (NO2, SO2, and CO2) and the mechanical properties of organic sensors fabricated from P3AT, with variations in alkyl chain lengths of 6,8,10 and 12 (P3HT, P3OT, P3DT, and P3DDT). Our investigation revealed a significant improvement in gas sensor performance as the alkyl side chain length increased, concurrently promoting improved mechanical properties. The P3DDT sensor exhibited a sensitivity approximately twice that of P3HT sensor, alongside displaying superior mechanical flexibility due to the free volume.