Stretchable patterned graphene gas sensor driven by integrated micro-supercapacitor array. (January 2016)

• Record Type: Journal Article
• Authors: Yun, Junyeong; Lim, Yein; Jang, Gwon Neung; Kim, Daeil; Lee, Seung-Jung; Park, Heun; Hong, Soo Yeong; Lee, Geumbee; Zi, Goangseup; Ha, Jeong Sook
• Is Part Of: Nano energy. Volume 19(2016:Jan.)
• Page Start: 401
• Page End: 414
• Publication Date: 2016-01
• Subjects: Stretchable -- Patterned graphene -- NO2 gas sensor -- Micro-supercapacitor array -- Integration -- Serpentine interconnection; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2015.11.023
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: We report on the fabrication of a stretchable patterned graphene gas sensor driven by integrated micro-supercapacitor (MSC) array on the same deformable substrate. The integrated MSCs consist of polyaniline-wrapped multi-walled carbon nanotube electrodes and an ionogel electrolyte of poly(ethylene glycol)diacrylate and 1-ethyl-3-methylimidazoliumbis (trifluoromethylsulfonyl) imide. The deformable soft Ecoflex substrate was designed to suppress the applied strain on the gas sensor and MSCs via insertion of stiff platforms of SU-8 underneath and serpentine electrical interconnections of polymer-encapsulated long and narrow Au thin film. The fabricated MSC array demonstrated stable electrochemical performance under a uniaxial strain of 50% and a biaxial strain of 40%, maintaining its initial characteristics even after 1000 cycles of repetitive uniaxial and biaxial stretching. Furthermore, the patterned-graphene sensor detected NO2 gas for longer than 50 min via integration with MSCs using the serpentine interconnections even under uniaxial stretching by 50%. This work suggests fundamental progress towards the development of stretchable environmental sensor system which can be driven by integrated energy storage devices without external long wire connections to power source. Graphical abstract: Highlights: We fabricate a stretchable gas sensor driven by integrated microsupercapacitor array. Stretchable substrate uses serpentine interconnections with embedded stiff platforms. Patterned graphene sensor stably detects NO2 gas upon 50% uniaxial stretching. With energy supplied by micro-supercapacitors, the gas sensor is operated for 50 min. Performance of micro-supercapacitors retains stable under repeated biaxial stretching.