POS5-1159
Decoupling Temperature Sensitivity and Humidity Interference in PEDOT:PSS Thermistors
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Sunwoo Cho (Seoul National University)
Co-Author(s)
Abstract
Poly(2,3-dihydrothieno-1,4-dioxin):poly(styrenesulfonate) (PEDOT:PSS) thermistors have attracted significant attention for their large negative temperature coefficient of resistance (TCR). However, humidity-induced resistance variation remains a critical challenge to be addressed. In fact, previous efforts to reduce humidity interference in PEDOT:PSS thermistors have often resulted in decreased sensitivity, suggesting that the measured TCR may partially reflect humidity-induced resistance variations. In this work, we investigated the underlying mechanism driving the trade-off between TCR and humidity interference. For this purpose, we fabricated thermistor films by incorporating graphene oxide or carbon nanotube into PEDOT:PSS. We then correlated the asymmetric heating-cooling responses observed under vacuum with microstructural properties and charge transport mechanisms. As a result, we developed a novel post-treatment method to overcome this trade-off in PEDOT:PSS-graphene oxide composite thermistor, achieving a large TCR of -1.23% K-1 and a high linearity of R2 > 0.99 even under dry N2 conditions. Overall, this work demonstrates a robust design principle for next-generation temperature sensors with both high sensitivity and reliability.
