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Inkjet Printing Patterns of Highly Conductive Pristine Graphene on Flexible Substrates
journal contribution
posted on 2015-12-17, 05:30 authored by Yahui Gao, Wen Shi, Wucong Wang, Yuanpeng Leng, Yaping ZhaoHighly
conductive pristine graphene electrodes were fabricated
by inkjet printing using ethyl cellulose-stabilized ink prepared from
pristine graphene. Pristine graphene was generated by exfoliation
from graphite using ultrasound-assisted supercritical CO2. The ink, at concentrations up to 1 mg/mL, was stable for more than
9 months and had compatible fluidic characteristics for efficient
and reliable inkjet printing. The inkjet printing patterns of the
graphene on diverse substrates were uniform and continuous. After
30 printing passes and annealing at 300 °C for 30 min, the printed
films developed a high conductivity of 9.24 × 103 S/m.
The resistivity of the printed electrodes on the flexible substrates
increased by less than 5% after 1000 bending cycles and by 5.3% under
a folding angle of 180°. The presented exfoliated pristine graphene
and the corresponding efficient methods for formulating the ink and
fabricating conductive electrodes are expected to have high potential
in applications involving graphene-based flexible electronic devices.