Oxygen‐Mediated Surface Engineering of 3D Porous Graphene for All‐Graphene‐Based Humidity Sensors

• Published in: Advanced materials interfaces 2024-06, Vol.11 (16), p.n/a
• Main Authors: Lee, Eunji, Kwon, Yeong Min, Bae, Garam, Park, Se Yeon, Song, Da Som, Jo, Hyeong‐ku, Lee, Do Hyung, Jeon, Hye Yoon, Kang, Saewon, Yim, Soonmin, Myung, Sung, Lim, Jongsun, Lee, Sun Sook, Yoon, Dae Ho, Song, Wooseok
• Format: Article
• Language: English
• Subjects: 3D porous graphene; Customization; Electrical properties; Graphene; Humidity; humidity sensor; Oxygen plasma; photon‐pen writing; Sensors; surface customization; Synthesis
• ISSN: 2196-7350; 2196-7350
• DOI: 10.1002/admi.202400041

Real‐world applications of graphene require reliable routes for synthesizing large‐area graphene and methods to tune its structural and electrical properties. A viable and facile route is presented for synthesizing 3D porous graphene (3PG) on PI films with tunable patterns and locations via the photon‐pen writing technique and subsequent oxygen plasma treatment. The laser power and scan speed are optimized for 3PG synthesis. The electrical properties and surface hydrophilicity are controlled via surface customization of 3PG with optimal oxygen plasma treatment duration and laser inter‐spacing. The capability of humidity sensors based on surface‐customized 3PG with hydrophobic surface is demonstrated. Graphene's real‐world applications demand reliable, scalable synthesis and structural control. A method is offered for 3D porous graphene (3PG) on PI films, created using photon‐pen writing and oxygen plasma treatment. Laser parameters, enabling control over electrical properties and hydrophilicity are optimized. This customized 3PG functions as a humidity sensor with a hydrophobic surface.