Photo-curing Metallic Inks via Copper Nanocluster Phase Control
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Solution Overview
Problem
The existing understanding and manipulation of copper nanoclusters for conductive paths in electronic circuitry face challenges in controlling their phase transitions, surface energy, and structural stability, particularly during the photonic curing process, which affects their melting points and electrical properties.
Innovation Solution
The development of copper nanoclusters with specific shapes, such as icosahedra and decahedra, and the use of photonic curing to control their size-dependent melting points and electrical conductivity, involving models like the solid core/liquid shell model and extensive molecular dynamics simulations to optimize their structure and behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper nanoclusters are used for conductive paths, then electrical conductivity is improved, but phase transition control during photonic curing becomes difficult
Solution Approach 1:
The patent applies parameter changes by controlling the size of copper nanoclusters (3-100 nm) to manipulate their melting points and phase transition behavior. By adjusting nanocluster dimensions, the material's thermal and electrical properties are optimized for photonic curing processes, enabling reliable conductive paths while controlling phase transitions.
Solution Approach 2:
The patent exploits phase transitions of copper nanoclusters during photonic curing to achieve desired conductive properties. The high surface area to volume ratio of nanoclusters creates unique thermodynamic behavior that enables controlled solidification and conductivity formation during the curing process.
2Stability of the object's composition
If nanocluster size is reduced to enhance surface energy effects, then structural stability is improved, but manufacturing precision becomes more difficult
Solution Approach 1:
The patent uses parameter changes to control nanocluster size within the 3-100 nm range, optimizing the balance between surface energy effects and manufacturing feasibility. By adjusting formulation parameters during synthesis, precise control over nanocluster dimensions is achieved while maintaining structural stability.
Solution Approach 2:
The patent applies preliminary action by pre-controlling nanocluster size and structure during the ink formulation stage before photonic curing. This preliminary structuring ensures that when the material is processed, the nanoclusters already possess the desired size distribution and structural stability, simplifying subsequent manufacturing.
3Reliability
If photonic curing is used to control melting points, then electrical properties are improved, but energy consumption increases
Solution Approach 1:
The patent exploits phase transitions of copper nanoclusters during photonic curing to achieve desired conductive properties. The high surface area to volume ratio of nanoclusters creates unique thermodynamic behavior that enables controlled solidification and conductivity formation during the curing process.
Solution Approach 2:
The patent applies parameter changes by controlling the size of copper nanoclusters (3-100 nm) to manipulate their melting points and phase transition behavior. By adjusting nanocluster dimensions, the material's thermal and electrical properties are optimized for photonic curing processes, enabling reliable conductive paths while controlling phase transitions.
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
This approach allows for precise control of copper nanoclusters' phase transitions and electrical properties, enhancing their stability and conductivity, leading to improved performance in photonic curing processes for electronic circuitry.
Implementation Method 1
photonic curing process
Implementation Method 2
phase transition situation, like copper from liquid to solid
Implementation Method 3
Clusters containing no more than a few hundred metal atoms, resulting in diameters around 3-5 nanometers, have strong, size-dependent properties due to quantum confinement
Implementation Method 4
Nanoclusters have a very high surface area to volume ratio resulting in a high surface energy
Data Source
AI summary
A solution of metal ink is mixed and then printed or dispensed onto the substrate using the dispenser. The film then is dried to eliminate water or solvents. In some cases, a thermal curing step can be introduced subsequent to dispensing the film and prior to the photo-curing step. The substrate and deposited film can be cured using an oven or by placing the substrate on the surface of a heater, such as a hot plate. Following the drying and/or thermal curing step, a laser beam or focused light from the light source is directed onto the surface of the film in a process known as direct writing. The light serves to photo-cure the film such that it has low resistivity.