What is it about?
Process begins by 3D printing a polyetherimide (PEI) based filament using a Fused Filament Fabrication (FFF) process whereby molten PEI is selectively extruded from a nozzle layer-by-layer to build a 3D geometry. The second stage of the process involves selectively metalizing the PEI surface using an electroless plating process initiated by the localized photoreduction of metallic nanoparticles. This is achieved by chemically modifying the polymer’s imide component. Upon exposure to UV light the silver ions are reduced through photolysis to synthesise metallic nanoparticles. The remaining silver nanoparticles act as a seed site for an electroless copper deposition. The final part of the process involves the incorporation of additional functionality using computer-controlled dispensing and robotic pick-and-place assembly (Fig. 1d). Further incorporation of actuation is achieved by embedding shape memory alloy wire within the printed part.
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Why is it important?
High-resolution conformal and flexible electronic circuitry on 3D printed substrate. Electrical, mechanical and thermal performance suitable for real-world applications. First example of surface mount packaging using solder reflow with 3D printed parts. Overcomes the restrictions of directly depositing conductive pastes and inks. Wide range of practical electronic applications demonstrated.
Perspectives
Read the Original
This page is a summary of: Light based synthesis of metallic nanoparticles on surface-modified 3D printed substrates for high performance electronic systems, Additive Manufacturing, August 2020, Elsevier,
DOI: 10.1016/j.addma.2020.101367.
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Resources
Overview of process and paper outputs - Digital fabrication of high performance three-dimensional electronic systems
Light based synthesis of metallic nanoparticles on surface-modified 3D printed substrates for high performance electronic systems
Butterfly
To showcase the freeform nature of this process a 3D butterfly shape is fabricated with a wingspan of 59 mm containing flexible and conformal circuitry
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