Ram Prasad Gandhiraman | Space Foundry: Can plasma-assisted aerosol jetting eliminate the post-deposition curing step entirely for printed metals?
08:00 - 09:47
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Can plasma-assisted aerosol jetting eliminate the post-deposition curing step entirely for printed metals?
Conventional aerosol jet printing processes deposit wet ink droplets that require high-temperature thermal ovens, lasers, or chemical agents to evaporate solvents and sinter the metal nanoparticles. Plasma jet printing, however, bypasses this bottleneck by generating a low-temperature plasma discharge directly inside the print head nozzle. This plasma physically breaks down the incoming aerosolized mist, creating highly energetic and charged atomic and molecular species.
By applying electromagnetic fields, the charged metallic species are driven downward at high velocities, bombarding the target substrate. This energetic bombardment induces localized kinetic activation at the surface interface, resulting in outstanding mechanical adhesion without requiring high substrate temperatures. The plasma gas chemistry is dynamically controlled to create a localized in-situ reducing environment by introducing small percentages of hydrogen gas.
The presence of active hydrogen radicals reduces the metallic precursor ions directly in flight. As a result, the material is deposited as a dry, fully reduced, and highly conductive metallic pattern on contact. This eliminates post-deposition thermal treatment, permitting direct-write metallization on ultra-sensitive substrates.
In this short video, you can learn:
* The physical mechanism behind plasma jet printing and how it extends traditional aerosol jetting.
* How electromagnetic field-driven kinetic bombardment dramatically enhances thin-film adhesion.
* The chemistry of in-situ metal reduction using localized hydrogen plasma to deposit dry, conductive traces.
š **Clip Abstract** This segment introduces the physics and chemistry of plasma jet printing as an evolutionary step beyond standard aerosol jetting. The speaker explains how in-flight reduction of metal ions via hydrogen plasma delivers fully dry, conductive traces directly onto substrates with zero post-deposition curing.
#PlasmaJetPrinting, #InFlightReduction, #DirectWriteMetallization, #AerosolJetting, #PrintedElectronics, #AdditiveElectronics
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06:22 - 08:00
How can we build 200-micron thick multi-layer electronics on composite materials without losing sub-micron alignment?
How can we build 200-micron thick multi-layer electronics on composite materials without losing sub-micron alignment?
Integrating high-performance electromagnetic patterns directly onto structural composite materials introduces massive mechanical and thermal constraints. Standard electronic fabrication routes rely on separate deposition and thermal curing stages, which inevitably introduce substrate distortion and compromise layer-to-layer alignment. For applications like phased arrays or frequency-selective surfaces on nose cones, this misalignment destroys RF performance.
Furthermore, these high-frequency structures require thick metallic traces, typically ranging between 50 and 200 microns. Building up this level of thickness using traditional wet inks leads to solvent entrapment, cracking, and delamination during subsequent cure steps. This dictates a radical shift towards dry, direct-write additive processes that can layer conductor and composite iteratively on a single platform.
By eliminating the decoupling between printing and curing, aerospace manufacturers can maintain precise structural registration. This single-step approach minimizes the thermal budget of the underlying low-glass-transition temperature (Tg) resins while ensuring the structural integrity of the composite sandwich is preserved.
In this short video, you can learn:
* Why decoupling printing and curing steps creates alignment failures in multi-layer composite structures.
* The strict thickness requirements (50 to 200 microns) for advanced RF metamaterials and antennas.
* How direct-write deposition avoids the structural and thermal degradation associated with conventional curing ovens.
š **Clip Abstract** This clip examines the manufacturing complexities of embedding multi-layer RF patterns and metamaterials directly into structural aerospace composites. Ram Prasad highlights why traditional printing and post-curing fail to meet the sub-micron alignment and high-thickness parameters (50-200 microns) required for next-generation airborne electronics.
#StructuralElectronics, #DirectWriteDeposition, #RFMetamaterials, #ThickFilmConductors, #AerospaceComposites, #AdditiveElectronics
10:35 - 12:43
Why are aqueous metal-salt inks outperforming traditional nanoparticle inks in low-porosity print metrics?
Why are aqueous metal-salt inks outperforming traditional nanoparticle inks in low-porosity print metrics?
Nanoparticle-based conductive inks face significant engineering hurdles, including particle aggregation, nozzle clogging, and high surfactant/polymer content that leaves behind porous voids after sintering. To solve this, a salt-based precursor approach mimics liquid-phase electrochemistry but operates in an open-air dry environment. The ink is a simplified, polymer-free aqueous solution of metal salts, such as copper sulfate, which is aerosolized and fed into the print head.
As the mist travels through the plasma zone, the dissolved metal cations (e.g., Cu2+) undergo a rapid gas-phase reduction to their zero-valent metallic state (Cu0). Because the precursor is entirely dissolved in water and lacks organic binders, there are no bulky capping ligands to burn off. This results in highly uniform, dense metallic structures that display far lower porosity compared to traditional nanoparticle-sintered films.
Furthermore, this chemical approach permits precise control over the morphology and oxidation state of the deposited film. By tuning the plasma power, gas flow rate, and precursor concentration, users can switch between depositing pure zero-valent metals, oxides, or custom alloys at near-room temperatures (50-60Ā°C).
In this short video, you can learn:
* The chemical differences between nanoparticle-filled inks and polymer-free, aqueous metal-salt precursors.
* How gas-phase plasma electrochemistry reduces copper and silver ions in-situ without liquid baths.
* The impact of salt-based precursor systems on reducing porosity and improving structural uniformity in printed traces.
š **Clip Abstract** Ram Prasad discusses the benefits of Space Foundry's aqueous, nanoparticle-free metal salt inks over standard nanoparticle inks. He explains how gas-phase plasma electrochemistry reduces metal ions in-flight to produce uniform, dense, low-porosity copper and silver traces at low temperatures.
#MetalSaltInks, #PlasmaElectrochemistry, #InFlightReduction, #ParticleFreeInks, #PrintedElectronics, #AdditiveElectronics