Abstract
Stable ink containing highly dispersed graphene nanosheets (GNSs) for inkjet printing on polyimide (PI) film has been successfully prepared by the adsorption of sodium n-dodecyl sulphate (SDS) and adjusting the pH value to 10 by ammonia. Conductive features on a flexible PI film were fabricated by inkjet printing the stable ink directly on a substrate. With higher number of printing cycles, the loading weight of GNS on PI film showed a linear increase up to printing 200 times, when the conductivity reached the saturation value of 6Sm−1. Sintering the printed GNS at 400°C can effectively lead to the elimination of excess SDS on the GNSs and increase the CC content. The data provided by a four-point probe show that the conductivity of the sintered film can be improved to 121.95Sm−1.
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