Stabilized Metallic Nanoparticle Ink for Ambient RFID Antenna Printing
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Solution Overview
Problem
Current methods for printing conductive metal markings, such as RFID antennas, require additional processing steps like curing, electroplating, or high-temperature sintering, making them costly and unsuitable for ambient conditions, especially on paper and plastic substrates.
Innovation Solution
A process involving the synthesis of stabilized metallic nanoparticles, formulation into ink, and direct printing on substrates under ambient conditions, followed by a simple annealing step, eliminating the need for additional chemicals or high-temperature processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional conductive inks are used with curing or electroplating steps, then conductive metal markings can be formed, but the process becomes costly and requires additional processing steps
Solution Approach 1:
The patent extracts and eliminates the curing step and electroplating step from the traditional conductive ink process. By using pre-stabilized metallic nanoparticles that can be directly printed and annealed at low temperatures, the invention removes complex additional processing steps while still achieving reliable conductive metal markings.
Solution Approach 2:
The metallic nanoparticles are pre-stabilized before printing, meaning their stability and conductivity are prepared in advance. This preliminary stabilization allows the nanoparticles to function directly after printing without requiring subsequent curing or electroplating steps, simplifying the overall process.
2Reliability
If high-temperature sintering is used to anneal particles, then conductive lines are created, but the substrate must withstand high temperatures
Solution Approach 1:
The invention changes the annealing temperature parameter from traditional high temperatures to low temperatures (below 200°C). This parameter change is enabled by using pre-stabilized metallic nanoparticles that can be annealed at low temperatures while still forming reliable conductive lines, thus protecting temperature-sensitive substrates like paper and cardboard.
3Reliability
If conventional conductive inks are used, then conductive markings can be printed, but toxic reagents and corrosive metal baths are required
Solution Approach 1:
The patent uses pre-stabilized metallic nanoparticles as a disposable, self-contained material that carries its own stability and conductivity properties. These nanoparticles eliminate the need for toxic reagents and corrosive metal baths, as the stabilization is already built into the particles themselves before printing.
4Ease of manufacture
If paper and cardboard substrates are used, then low-cost printing is possible, but the substrates cannot withstand high temperatures or wet processes
Solution Approach 1:
The invention changes the process temperature parameter to below 200°C, which is compatible with paper and cardboard substrates that cannot withstand high temperatures. This low-temperature annealing process allows conductive metal markings to be formed on cost-effective substrates like paper and cardboard without damaging them.
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 simplifies the printing process, reduces costs, and allows for effective conductivity on various substrates without the need for corrosive reagents or complex processing, making it suitable for paper and cardboard packaging materials.
Implementation Method 1
providing stabilized metallic nanoparticles
Implementation Method 2
printing the ink directly on a substrate, to create metal markings on the substrate
Implementation Method 3
The printed conductive metal markings may form wires that behave as resonant RFID antennas
Data Source
AI summary
A process for printing conductive metal markings directly on a substrate under an ambient condition, including the steps of synthesizing or providing conductive the ink on a substrate to form conductive metallic nanoparticles into an ink; and printing the ink on a substrate to form conductive metallic markings on the substrate. The printed conductive metallic markings may form wires that behave as resonant RFID antenna applications.