Mechanical Sintering of Nanoparticle Inks on Flexible Substrates
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Solution Overview
Problem
The printed electronics industry faces challenges in sintering nanoparticle inks on flexible substrates, as high temperatures required for traditional sintering methods are not compatible with these substrates, leading to complications in adhesion, thickness, production rate, and adaptability, especially in roll-to-roll processes.
Innovation Solution
The use of mechanical energy, such as uniaxial pressure, hydrostatic pressure, and ultrasound, to sinter nanoparticle inks and powders at low temperatures, enabling the production of conductive lines on flexible substrates without the need for high-temperature processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature sintering is used to sinter nanoparticle inks, then the nanoparticle inks transform to their original bulk material properties and achieve good conductivity, but the flexible substrates cannot withstand the high temperatures and suffer damage or degradation
Solution Approach 1:
The patent changes the sintering parameter from high temperature to low temperature by using a eutectic salt composition that melts at a low temperature (below the substrate's thermal tolerance) and enables nanoparticle sintering through the molten salt medium, thus achieving good conductivity without damaging flexible substrates
Solution Approach 2:
The patent utilizes the phase transition of the eutectic salt composition from solid to liquid at its melting point, where the molten salt enables nanoparticle sintering through liquid-phase sintering mechanisms, and then the salt solidifies upon cooling to leave behind sintered nanoparticles with good conductivity
2Temperature
If photosintering with strong flash of light energy is used to sinter nanoparticle inks, then sintering can be achieved at low temperature, but the process does not meet production requirements such as final adhesion, thickness, production rate, and adaptability to roll-to-roll process
Solution Approach 1:
The patent replaces the photosintering method (optical energy) with a thermal-chemical method using eutectic salt composition, where the molten salt provides a liquid-phase environment for sintering that enables better adhesion, thickness control, and scalability to roll-to-roll production processes
Solution Approach 2:
The eutectic salt composition acts as an intermediary medium that facilitates nanoparticle sintering at low temperatures through liquid-phase sintering, enabling the process to meet production requirements for adhesion, thickness, and scalability that photosintering cannot achieve
3Reliability
If high temperature sintering is used to sinter nanoparticle inks, then good conductivity and adhesion are achieved, but the process is not compatible with flexible substrates and roll-to-roll printing
Solution Approach 1:
The patent changes the sintering temperature parameter to be below the thermal tolerance of flexible substrates by using eutectic salt composition with low melting point, thereby achieving good adhesion and conductivity while maintaining compatibility with flexible substrates and roll-to-roll printing processes
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 method allows for the production of conductive lines with reduced porosity and improved conductivity, making it compatible with low-temperature processes and roll-to-roll printing, while maintaining strong adhesion and efficient production.
Implementation Method 1
mechanical sintering of nanoparticle inks and powders
Implementation Method 2
uniaxial pressure, hydrostatic pressure
Implementation Method 3
ultrasound
Data Source
AI summary
Nanoparticle inks and powders are sintered using an applied mechanical energy, such as uniaxial pressure, hydrostatic pressure, and ultrasonic energy, which may also include applying a sheer force to the inks or powders in order to make the resultant film or line conductive.