3D Surface Circuit Patterning via Pulsed Light Zinc Transfer
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Solution Overview
Problem
Current methods for fabricating electronic circuits on 3D freeform surfaces face challenges such as incompatibility with lithography processes, complex fabrication processes, limited patterning accuracy, and environmental concerns due to noble metal use, especially for wearable and flexible electronics.
Innovation Solution
The use of intense pulsed light-induced mass transfer (IPLMT) of zinc nanoparticles (Zn NPs) to directly deposit conductive patterns on 3D surfaces, followed by a single-replacement reaction to convert Zn into long-lasting copper or silver, utilizing a kirigami-patterned mask and a pliable carrier film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum-based deposition tools are used for circuit fabrication, then high-quality conductive patterns can be achieved, but the process is time-consuming and limited to planar surfaces
Solution Approach 1:
The patent replaces vacuum-based mechanical deposition systems with a light-driven mass transfer system. Intense pulsed light irradiation causes zinc nanoparticles to evaporate and deposit onto the target surface, eliminating the need for vacuum pumps and complex mechanical deposition equipment while achieving comparable patterning quality.
Solution Approach 2:
The invention changes the fundamental operating parameters from vacuum conditions to atmospheric pressure, and from continuous thermal processing to pulsed light irradiation. This enables rapid fabrication on both planar and 3D surfaces without the time-consuming vacuum pumping process.
2Adaptability or versatility
If advanced printing techniques like omnidirectional printing are used, then direct fabrication on arbitrary surfaces is enabled, but precise motion control and surface scanning are required
Solution Approach 1:
The patent extracts and removes the complex motion control system and high-resolution scanning requirements from the fabrication process. By using light-driven mass transfer, the system can deposit materials on arbitrary 3D surfaces without requiring precise mechanical positioning or real-time surface mapping.
Solution Approach 2:
The invention introduces a photoresist layer as an intermediary that defines the pattern geometry. The intense pulsed light selectively removes zinc nanoparticles through the photoresist openings, enabling direct patterning on complex surfaces without sophisticated motion control.
3Ease of operation
If aerosol jet printing is used for non-contact ink dispensing, then larger working distance tolerance is achieved, but aerodynamic processes cause fuzzy edges and overspray
Solution Approach 1:
The patent replaces the aerodynamic ink dispensing process with a light-driven mass transfer mechanism. Zinc nanoparticles are evaporated by intense pulsed light and deposit directly onto the target surface through openings in the photoresist, eliminating overspray and achieving sharp edges without complex aerodynamic control.
4Adaptability or versatility
If adaptive 3D printing with real-time scanning is used, then patterning on moving freeform surfaces is enabled, but high-accuracy scanning devices and temperature control are required
Solution Approach 1:
The invention removes the requirement for real-time high-accuracy scanning devices and complex temperature control systems. The intense pulsed light process operates at atmospheric pressure with simple illumination, enabling fabrication on freeform surfaces without sophisticated scanning or environmental control equipment.
5Reliability
If noble metal nanomaterials are used for printing, then high conductivity is achieved, but environmental concerns and health issues increase
Solution Approach 1:
The patent uses zinc nanoparticles as a temporary, sacrificial material that is later replaced by noble metals through a single-replacement reaction. This approach eliminates the need to directly handle and deposit expensive noble metal nanoparticles, reducing environmental impact and health risks while still achieving high-conductivity final products.
Solution Approach 2:
Zinc serves as an intermediary material that enables the fabrication process without direct noble metal deposition. The zinc patterns are subsequently converted to copper or silver through chemical replacement reactions, providing a safer and more environmentally friendly manufacturing route.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables rapid, low-cost, and environmentally friendly fabrication of transient or long-lasting circuits on complex surfaces, eliminating the need for vacuum deposition and high-resolution scanners, with high conductivity and flexibility for wearable devices.
Implementation Method 1
The intense pulsed light can locally raise the temperature of Zn NPs to cause evaporation
Implementation Method 2
The intense pulsed light can locally raise the temperature of Zn NPs to cause evaporation
Implementation Method 3
atoms of the metal NPs to evaporate and transport through openings of the pliable mask and condense on the target surface
Implementation Method 4
Laminating a kirigami-patterned soft semi-transparent polymer film with Zn NPs conforming to a 3D surface
Data Source
AI summary
The invention includes methods of forming electronic circuitry on a target surface using intense pulsed light-induced mass transfer (IPLMT) of metal nanoparticles (NPs) by applying a pliable mask to a target surface, coating a carrier film with metal NPs, mounting the carrier film to the target surface and over the pliable mask so that the pliable mask is sandwiched between the target surface and the metal NPs. and exposing the metal NPs to light energy to cause atoms of the metal NPs to evaporate and transport through openings of the pliable mask and condense on the target surface, producing a conductive pattern of condensed metal on the target surface. Certain implementations may utilize a kirigami-patterned pliable mask to enhance conformity to a freeform 3D target surface. In certain implementations, zinc (Zn) may be formed by IPLMT of Zn NPs to the target surface.