Infra-red assisted sintering of inkjet printed silver tracks on paper substrates |
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Authors: | Aurore Denneulin Anne Blayo Charles Neuman Julien Bras |
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Institution: | 1.Polypore Europe,Gennevilliers,France;2.Laboratory of Pulp and Paper Science and Graphic Arts (LGP2) (UMR 5518 CNRS-CTP-INPG), Grenoble Institute of Technology (INP Grenoble-PAGORA),St Martin d’Hères Cedex,France |
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Abstract: | In this study, conductive silver features using inkjet printing have been successfully prepared and their sintering studied.
Regarding conductivity, metallic inks are the most efficient available conductive inks, even if important drawbacks regarding
the use of such inks in inkjet still exist. Indeed, the sintering step is an important limiting factor for the productivity
and the substrate choice. An infrared (IR) drying method was experimented to optimize the sintering treatment time. Trials
with glass and paper substrates were performed and proved that IR drying is interesting to optimize sintering. Indeed a similar
level of resistance was obtained for conventional heating (200 °C, 5 min) and for IR radiations within a shorter treatment
time (3 min). Moreover, the substrate temperature during the IR sintering treatment was controlled. The substrate appears
to be a relevant parameter to optimize sintering because its thermal behaviour directly impacts on the treatment duration.
And for the first time a sheet resistance of 1.9 Ω sq−1 was obtained on paper substrate after only 2 min of IR treatment without any observation of substrate degradation. The evaluation
of an electrical treatment on the sintering of a nanoparticle film was also performed using a corona pre-treatment. This lead
appears to be interesting because the study proves that an electrical treatment can initiate the sintering of silver nanoparticles.
The current flow generated by the corona electrodes certainly generates a local heating by dissipation of the conductive pattern.
Finally, the solutions presented in this article allow reducing the sintering time of silver conductive inkjet inks. However
mainly, it proves that using paper as substrate for such inks is now possible. |
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