J. Mater. Sci. Technol. ›› 2020, Vol. 58: 16-23.DOI: 10.1016/j.jmst.2020.03.055

• Research Article • Previous Articles     Next Articles

Interconnected graphene scaffolds for functional gas sensors with tunable sensitivity

Xiao Youa,c,d, Jinshan Yanga,c,*(), Mengmeng Wanga,c,d, Hongda Wanga,c, Le Gaoa,c, Shaoming Donga,b,c,*()   

  1. aState Key Laboratory of High Performance Ceramics & Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
    bCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
    cStructural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
    dUniversity of Chinese Academy of Sciences, Beijing, 100039, China
  • Received:2020-02-02 Accepted:2020-03-16 Published:2020-12-01 Online:2020-12-17
  • Contact: Jinshan Yang,Shaoming Dong


In this work, the interconnected graphene scaffolds are prepared by three-dimensional (3D) printing for multifunctional gas detection with tunable sensitivity. The scaffolds with regularly aligned graphene conductive networks exhibit significant mechanical strength and high electrical stability to multi-direction deformation, which can be attributed to the typical core-shell structure of graphene and PVP. The resistance of the free-standing scaffolds can realize the real-time response to H2O and NO2, and the relative resistance change to 100 ppm H2O and 100 ppm NO2 can reach 2% and 2.5 %, respectively. The charge doping of the oxidizing gases is considered to be the main reason for various response sensitivities of the scaffolds with different orthogonal layers, in which the interconnected conductive network can generate a large specific surface area and significantly improving the adsorption of the target gases and the transfer of charge. The controllable fabrication of regular structure has appropriately great potential for further optimizations and applications in gas detection.

Key words: Graphene scaffolds, Interconnected network, 3D printing, Gas sensors, Multifunctional gas detection