Highly Sensitive and Stable In Situ Acetylene Detection in Transformer Oil Using Polyimide‐Embedded Carbon Nanotubes

• DOI: 10.1002/adma.202410179
• Publication Date: 2024-11-29T07:10:21Z
• Authors: Sihyeok Kim; Jin‐Myung Choi; Ilya V. Novikov; Jeong‐Seok Nam; Il‐hyun Lee; Liang Cai; Jonghyuk Yoon; Yeounggyu Lee; Jaehoon Lee; Bjorn Mikladal; Boseok Kang; Esko I. Kauppinen; Keekeun Lee; Il Jeon
• Keywords: Acetylene

Abstract This study presents an acetylene gas sensor capable of in situ monitoring transformer oils. utilizes carbon nanotubes (CNTs) embedded polyimide (PI) synthesized by floating catalyst chemical vapor deposition. Unlike conventional sensors that target hydrocarbon gases dissolved oil and measure the extracted from oil, proposed CNT‐PI detects within real time. The PI embedding technique effectively anchors shields CNT network against fluidic damage, ensuring stable sensing performance over 6 months, even under friction stress caused convection. Decorating CNTs with gold nanoparticles further enhances sensitivity response sensor. achieves a high (10.5% at 30 ppm) fast response/recovery times (28 s/77 s), Furthermore, demonstrates good (10.4% moderate (444 s/670 s) medium, which qualifies for industrial applications. Additionally, CNT‐PI‐based heater is integrated into as multilayer component, maintaining optimal operating temperature 90 °C. consistent gas‐sensing after 10,000 bending cycles exhibits superior characteristics, indicating its compatibility various forms transformers.