Room temperature-sintering conductive ink fabricated from oleic-modified graphene for the flexible electronic devices
Authors: Tam The Le,[a] Huy Hoang Tran Bui,[b] An Khang Phung Dinh,[c] Duc Vu Van,[d] Quang Dinh Ho,[a] Hoai An Nguyen Thi,[b] Du Hoa Nguyen,[a] and Duong Duc La*[e]
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Publishing year: 1/2022
Graphene, a novel 2D nanomaterial, has been intensively
studied and utilized in many fields of applications. Graphenebased conductive ink has attracted many scientific researchers
due to its flexibility, durability, and, most importantly, high
electrical conductivity. However, the low dispensability and
high curing temperature have hindered the use of graphene
ink in many practical applications. In this work, graphene
nanoplatelets (GNPs) were modified with oleic acid to improve
dispensability. Then, the modified GNPs were employed as a
major component in the conductive ink‘s formulation. The
effects of the oleic acid, binder, and GNPs contents on the
conductivity of the prepared ink were studied. The results
showed that at the ink‘s formulation of 0.75% binder and 6 %
GNPs (modified with 2.5% oleic acid), the lowest resistance
with the value of 22 Ω.cm and sheet resistance of 7.56 Ωcm2
was obtained. Remarkably, the high conductivity of the
modified conductive ink on the substrate could also be
observed after curing at room temperature, which is advantageous for practical application. The viscosity of the resultant
conductive ink could also be adjusted by changing the amount
of solvent in the ink‘s formulation for application of the ink in
the pen, painting, or inkjet printing.
Graphene · conductive ink · nanotechnology · flexible electronic devices
