Large-Area Printed Oxide Film Sensors Enabling Ultrasensitive and Dual Electrical/Colorimetric Detection of Hydrogen at Room Temperature

• DOI: 10.1021/acssensors.3c00469
• Publication Date: 2023-07-25T01:12:55Z
• Authors: Henok Getachew Girma; Ka Yeon Ryu; Xiaowu Tang; Gi-Seong Ryu; Rixuan Wang; Yejin Kim; Jae Ook Choi; Hye Min Lee; Seungju Jeon; Seo-Hyun Jung; Jong Mok Park; Yu Jin Jung; Jin Young Kim; Do-Hoon Hwang; Yong-Young Noh; Bogyu Lim; Hoyoul Kong; Se Hyun Kim
• Keywords: Colorimetry

Commercial hydrogen (H2) sensors operate at high temperatures, which increases power consumption and poses a safety risk owing to the flammable nature of H2. Here, polymer-noble metal-metal oxide film is fabricated using spin-coating printing methods realize highly sensitive, low-voltage operation, wide-operating-concentration, near-monoselective H2 sensor room temperature. The with an optimized thickness Pd nanoparticles SnO2 showed extremely response 16,623 time 6 s recovery 5 temperature 2% At same time, printed flexible demonstrate excellent sensitivity, 2300 sensing performance due optimal thickness, corresponding Debye length oxygen spillover caused by coverage catalyst. Furthermore, multistructures WO3 films are used fabricate new type dual-signal sensor, demonstrated simultaneous conductance transmittance, i.e., color change. This work provides effective strategy develop robust, flexible, transparent, long-lasting through large-area processes based on polymer-metal-metal nanostructures.