Covalent bonds-integrated graphene foam with superb electromechanical properties as elastic conductor and compressive sensor. (June 2019)

• Record Type: Journal Article
• Authors: Liang, Jingjing; Zhao, Zongbin; Tang, Yongchao; Hao, Xiaojuan; Wang, Xuzhen; Qiu, Jieshan
• Is Part Of: Carbon. Volume 147(2019)
• Page Start: 206
• Page End: 213
• Publication Date: 2019-06
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.02.087
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Constructing highly conductive and mechanically robust graphene foams remains a great challenge for practical applications. Herein, we report a facile fabrication of covalently cross-linked graphene foam (CCGF) by CN bonds with superb electromechanical properties. Benefiting from covalent bonds-enhanced effect and removal of oxygen-containing groups of GO sheets, the resulting CCGFs exhibit an excellent compressibility and conductivity. More importantly, the CCGFs exhibit tunable conductivity at different compressed strains and ultrasensitive stress responsivity (0.046 kPa −1 in the regime of 3.5–5 kPa), featuring huge prospects for elastic conductive and ultrasensitive sensing applications. The proposed strategy may enlighten the fabrication of novel materials via cross-linking for other related applications. Graphical abstract: The nitrogen-containing covalently cross-linked graphene foams with superb compressibility and conductivity fabricated by a facile covalent assembly-annealing strategy. The covalently cross-linked GO foam annealed at 300 °C shows tunable conductivity of with different compressions and ultrasensitive piezo-resistance responsibility, holding a huge promise for elastic conductive and compressive sensing applications. Image 1