Conductive Wire Ink Formulation for Uniform Electroless Plating
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Solution Overview
Problem
Existing methods for making conductive wires using inkjet printing and electroplating result in non-uniform thickness due to high carbon nanotube concentrations, leading to uneven current density and wire thickness.
Innovation Solution
A method involving an ink with a lower concentration of functionalized carbon nanotubes (0.1-5 wt%) dispersed in a solvent, combined with a viscosity modifier, surfactant, and binder, followed by electroless plating to create uniformly conductive wires, where the carbon nanotubes are functionalized to enhance solubility and dispersion, and a moisturizing agent is added to prevent volatility, allowing for uniform deposition and electroless plating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large mass ratio of carbon nanotubes in the dispersion solvent is used to ensure formation of a conductive baseline, then the conductive baseline can be formed for electroplating, but the carbon nanotubes cannot be dispersed in the solvent uniformly, resulting in a non-uniform thickness of the interconnection wires
Solution Approach 1:
The patent changes the concentration parameter of carbon nanotubes in the dispersion solvent from above 10% to 0.1-5%, and modifies the chemical properties by introducing functional groups (carboxyl, hydroxyl, amino) on the carbon nanotube surfaces. These parameter changes enable uniform dispersion at lower concentrations while maintaining sufficient conductivity for electroplating baseline formation.
Solution Approach 2:
The patent introduces functional groups as intermediary chemical structures on the carbon nanotube surfaces that enhance interaction with the dispersion solvent. These functional groups act as mediators that improve wetting and dispersion uniformity, allowing carbon nanotubes to be evenly distributed in the solvent at lower concentrations without aggregating.
2Productivity
If current density in the conductive baseline is non-uniform during electroplating, then the process can proceed, but the thickness of the interconnection wires becomes non-uniform
Solution Approach 1:
The patent performs preliminary functionalization of carbon nanotubes with conductive metal particles (silver, copper, or aluminum) before creating the dispersion. This preliminary action ensures uniform electrical properties throughout the baseline, which then enables uniform current density distribution during the subsequent electroplating process, leading to uniform wire thickness.
Solution Approach 2:
The patent modifies the electrical conductivity parameter of the carbon nanotube baseline by incorporating metal particles and optimizing the concentration to 0.1-5%. This parameter change ensures sufficient and uniform conductivity throughout the baseline, which directly controls the uniformity of current density distribution during electroplating and prevents thickness variations.
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
The method achieves uniform thickness and increased efficiency in electroless plating by ensuring uniform dispersion of carbon nanotubes and a large specific surface area for metal ion adsorption, resulting in consistent conductive wire thickness and improved plating efficiency.
Implementation Method 1
carbon nanotubes are functionalized to enhance solubility and dispersion
Implementation Method 2
the organic solvent is evaporated to obtain a conductive baseline
Implementation Method 3
a large specific surface area for metal ion adsorption
Data Source
AI summary
A method for making conductive wires is provided. Firstly, an ink having carbon nanotubes is provided. Secondly, a baseline is formed using the ink on a substrate. Thirdly, the baseline is electroless plated.