Research Article www.acsami.org
Highly Sensitive Flexible NH3 Sensors Based on Printed Organic Transistors with Fluorinated Conjugated Polymers Benjamin Nketia-Yawson,† A-Ra Jung,§ Yohan Noh,∥ Gi-Seong Ryu,‡ Grace Dansoa Tabi,† Kyung-Koo Lee,∥ BongSoo Kim,*,§ and Yong-Young Noh*,†,‡ †
Department of Energy and Materials Engineering and ‡Advanced Energy and Electronic Materials Research Center, Dongguk University, 30 Pildong-ro, 1-gil, Jung-gu, Seoul 04620, Republic of Korea § Department of Science Education, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea ∥ Department of Chemistry, Kunsan National University, 558 Daehak-ro, Gunsan, Jeonbuk 54150, Republic of Korea S Supporting Information *
ABSTRACT: Understanding the sensing mechanism in organic chemical sensors is essential for improving the sensing performance such as detection limit, sensitivity, and other response/recovery time, selectivity, and reversibility for real applications. Here, we report a highly sensitive printed ammonia (NH3) gas sensor based on organic thin film transistors (OTFTs) with fluorinated difluorobenzothiadiazole-dithienosilole polymer (PDFDT). These sensors detected NH3 down to 1 ppm with high sensitivity (up to 56%) using bar-coated ultrathin (
