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Sand‐Milling Exfoliation of Structure Controllable Graphene for Formulation of Highly Conductive and Multifunctional Graphene Inks
Author(s) -
Chen Huqiang,
Zhang Yujin,
Ma Yu,
Chen Songbo,
Wu Yiqi,
Lu Yue,
Ren Hao,
Xin Shixuan,
Bai Yongxiao
Publication year - 2021
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202000888
Subject(s) - graphene , materials science , exfoliation joint , supercapacitor , nanotechnology , graphite , inkwell , electronics , electrical conductor , screen printing , printed electronics , conductive ink , conductivity , aqueous solution , flexible electronics , composite material , capacitance , sheet resistance , electrode , chemistry , layer (electronics)
Conductive graphene inks have shown a great potential for the manufacturing of high‐performance flexible wearable electronics. However, the lack of cost‐effective, straightforward, and facile routes to formulate multifunctional graphene aqueous inks with excellent conductivity and high apparent viscosity have greatly limited their applications, particularly in high concentration processing and additive‐manufacturing. Here, the high‐concentration graphene aqueous inks based on structure controllable, sand‐milling exfoliation of raw graphite is reported. Such a route yields 62.8% graphene dispersed in water with a high concentration up to 25.1 mg mL −1 , which can be formulated into aqueous inks with excellent printability. As such, the screen printing of the viscous graphene inks into film‐heating devices and micro‐supercapacitors (MSCs) is further demonstrated. Due to its excellent conductivity (up to ≈870 S cm −1 after annealing), the graphene film showcases a fast ramping temperature (171.9 °C) at 8 V in 75 s in the heating device, and a high areal capacitance (1.36 mF cm −2 ) in the MSCs, respectively. It is thus believed that the mechanical‐exfoliated graphene inks hold great promise in scalable production of high‐performance printable wearable electronics.