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2018

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cc-by (c) Sopeña i Martínez, Pol et al., 2018
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/122610

Spraying dynamics in continuous wave laser printing of conductive inks

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Recurs relacionat

https://doi.org/10.1038/s41598-018-26304-9

Resum

Laser-induced forward transfer (LIFT), though usually associated with pulsed lasers, has been recently shown to be feasible for printing liquid inks with continuous wave (CW) lasers. This is remarkable not only because of the advantages that the new approach presents in terms of cost, but also because of the surprising transfer dynamics associated with it. In this work we carry out a study of CW-LIFT aimed at understanding the new transfer dynamics and its correlation with the printing outcomes. The CWLIFT of lines of Ag ink at different laser powers and scan speeds revealed a range of conditions that allowed printing conductive lines with good electrical properties. A fast-imaging study showed that liquid ejection corresponds to a spraying behavior completely different from the jetting characteristic of pulsed LIFT. We attribute the spray to pool-boiling in the donor film, in which bursting bubbles are responsible for liquid ejection in the form of projected droplets. The droplet motion is then modeled as the free fall of rigid spheres in a viscous medium, in good agreement with experimental observations. Finally, thermo-capillary flow in the donor film allows understanding the evolution of the morphology of the printed lines with laser power and scan speed.

Matèries

Làsers, Tinta, Mecànica de fluids

Matèries (anglès)

Lasers, Ink, Fluid mechanics

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Articles publicats en revistes (Física Aplicada)

Citació

SOPEÑA I MARTÍNEZ, Pol, GONZÁLEZ-TORRES, Sergio, FERNÁNDEZ PRADAS, Juan marcos, SERRA COROMINA, Pere. Spraying dynamics in continuous wave laser printing of conductive inks. _Scientific Reports_. 2018. Vol. 8, núm. 7999. [consulta: 24 de gener de 2026]. ISSN: 2045-2322. [Disponible a: https://hdl.handle.net/2445/122610]

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