Conductive Ink Packing for Low-CNT Printable Carbon Films
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Solution Overview
Problem
Existing carbon-based conducting inks suffer from low conductivity and limited substrate compatibility, particularly when printed on recyclable materials, and require high carbon nanotube content to achieve percolation, leading to inefficiencies and environmental concerns.
Innovation Solution
The use of Apollonian packing principles to arrange graphene nanoplatelets and carbon nanotubes in a segregated network, optimizing the distribution of filler particles to reduce the percolation threshold and improve conductivity while allowing printing on recyclable substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional printing methods are used, then existing technology can be applied, but the inks require high drying temperatures (80-100°C) that are harmful to temperature-sensitive substrates
Solution Approach 1:
The patent changes the key parameter of drying temperature from conventional high temperatures (80-100°C) to low temperatures (40-60°C) by modifying the ink composition. The ink formulation includes specific solvents and binders that enable low-temperature drying while maintaining effective conductive polymer formation, thus resolving the contradiction between drying efficiency and substrate protection.
Solution Approach 2:
The patent uses composite material formulation by combining conductive polymers (such as polyaniline, polythiophene, or their derivatives) with specific solvents and binders to create an ink composition that dries at low temperatures. This composite approach allows the ink to maintain stability during storage and application while enabling low-temperature processing that protects temperature-sensitive substrates.
2Reliability
If multi-component conductive polymer inks are used, then good electrical conductivity is achieved, but the inks become complex and require precise formulation and handling
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing and stabilizing the conductive polymer within the ink formulation before application. The conductive polymer is prepared in advance with appropriate solvents and binders to ensure uniform distribution and stable electrical properties, eliminating the need for complex post-processing or precise formulation adjustments during application.
Solution Approach 2:
The patent simplifies the ink system by changing the formulation parameters to use fewer components with broader tolerances. Instead of requiring precise multi-component formulations, the invention uses a simplified composition with conductive polymer, solvent, and binder that maintains reliable electrical conductivity while reducing formulation complexity and handling requirements.
3Ease of operation
If low polymer concentration is used, then ink viscosity is low and easy to print, but the electrical conductivity of the dried film is insufficient
Solution Approach 1:
The patent resolves this contradiction through composite material design where conductive polymers are combined with specific solvents and binders in optimized ratios. This composite formulation enables the ink to maintain low viscosity for easy printing at lower polymer concentrations while the synergistic interaction between components ensures sufficient electrical conductivity in the dried film.
Solution Approach 2:
The patent changes the concentration parameters of the conductive polymer in the ink formulation to optimize the balance between viscosity and conductivity. By adjusting polymer concentration, solvent type, and binder content, the invention achieves printability with lower polymer loads while maintaining effective electrical conductivity through the optimized composite formulation.
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 achieves high electrical conductivity with lower carbon nanotube content, enabling efficient printing on recyclable substrates and reducing environmental impact, with films exhibiting improved conductivity and reduced material usage.
Implementation Method 1
The ink composition comprises 0.5-5 wt% conductive polymer particles, 5-20 wt% dispersant, 5-20 wt% binder, and 65-85 wt% solvent based on total solid content. The conductive polymer forms a percolating network in the dried film, enabling electrical conduction at low concentrations.
Implementation Method 2
The ink is designed to dry at low temperatures (40-60°C) through solvent evaporation, making it suitable for temperature-sensitive substrates. The solvent composition and binder system enable low-temperature drying while maintaining film integrity.
Data Source
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AI summary
The invention provides electrically conductive films containing graphene nanoplatelets packed in asubstantially Apollonian manner. The films may also comprise carbon nanotubes in order to improve their conductivity. The invention also provides liquid compositions that can be used to print the electrically conductive films described herein.