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3D Shape Control of Printed Micro-Electrodes with Substrate Reshaping

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Additive manufacturing (AM) techniques based on liquid precursors,
including inkjet printing or laser-induced forward transfer (LIFT), are
emerging as the tool-of-choice for the on-demand fabrication of printed
electronic devices on flat and flexible substrates. However, the aspect ratio of
the printable structures, which is key for determining electrical properties, is
typically determined by the wettability between printed ink and substrate.
Higher aspect-ratio structures can only be achieved by multi-pass printing,
with the consequent loss of fabrication throughput and increase in
complexity. Here, these issues are addressed by using print-n-release, a
method based on printing micro-electrodes on pre-stretched elastomeric
substrates. Upon stress release, the liquid-printed electrodes shrink while
increasing their aspect-ratio. As a result, their final shape can be tailored
beyond the limitations imposed by wetting constraints, enabling intentional
miniaturization by design. The principle and practical implementation of
print-n-release are described, and show how electrodes with up to an 8 fold
increase in aspect-ratio and a 4 fold reduction in sheet resistance can be
produced in a single-pass compared to traditional printing methods. As a
proof-of-concept, functional interdigitated electrodes that serve as sensors for
drop volume and electrolyte concentration, delivering enhanced sensitivity
and a reduced footprint not achievable with standard printing techniques are
fabricated.

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Versió postprint del document publicat a:

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Articles publicats en revistes (Física Aplicada)

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3D Shape Control of Printed Micro-Electrodes with Substrate Reshaping