Nanoparticle Ink Composition for Flexible Substrate Printing
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Solution Overview
Problem
Current ink formulations based on semiconductor nanoparticles face challenges such as instability, unsuitability for industrial-scale production, and incompatibility with flexible substrates, while also failing to preserve the intrinsic electronic and fluorescence properties of nanoparticles.
Innovation Solution
A stable ink composition comprising conductive/semiconductive metal oxide nanoparticles with 5-15% acetate ligands, mixed with aliphatic and unsaturated alcohols as solvents, a dispersant, and an optional thickener/stabilizer, synthesized through chemical methods that maintain nanoparticle properties and allow for versatile application across various printing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If physical synthesis methods (CVD, thermal evaporation) are used to produce semiconductor nanoparticles, then high purity and controlled morphology are achieved, but high temperatures are required making them unsuitable for flexible substrates and difficult to scale industrially
Solution Approach 1:
The patent replaces physical/thermal synthesis methods with chemical synthesis methods. Instead of using high-temperature physical processes like CVD and thermal evaporation, the invention employs chemical reactions in solution to produce semiconductor nanoparticles. This substitution allows synthesis at lower temperatures compatible with flexible substrates while maintaining industrial scalability through solution-based processing.
Solution Approach 2:
The patent changes the synthesis parameters from high-temperature physical conditions to controlled chemical reaction conditions in solution. By adjusting chemical parameters such as precursor concentration, pH, temperature (at much lower levels), and reaction time, the invention achieves precise control over nanoparticle morphology, size, and composition without requiring extreme thermal conditions.
2Ease of operation
If semiconductor nanoparticles are dispersed in conventional solvents, then they can be processed, but the intrinsic electronic properties and fluorescence characteristics of the nanoparticles deteriorate
Solution Approach 1:
The patent changes the solvent parameters by selecting specific solvents with appropriate polarity, proticity, and molecular size. The invention identifies that certain solvents (e.g., non-protic solvents with specific dielectric constants) maintain nanoparticle electronic properties while still providing adequate dispersibility. This parameter optimization resolves the contradiction between processability and property preservation.
Solution Approach 2:
The patent introduces surfactants or ligands as intermediary substances between the semiconductor nanoparticles and the solvent. These intermediaries protect the nanoparticle surfaces, prevent aggregation, maintain electronic properties, and simultaneously ensure good dispersibility and processability. The intermediary layer acts as a buffer that preserves intrinsic properties while enabling processing.
3Stability of the object's composition
If storage stability is improved by adding stabilizers and dispersants, then nanoparticle aggregation is prevented, but the formulation complexity increases and may interfere with electronic properties
Solution Approach 1:
The patent employs solvents and surfactants that perform multiple functions simultaneously. The selected solvents provide both dispersion medium functionality and stabilization through their molecular interactions with nanoparticle surfaces. Surfactants serve dual roles as both dispersants and protective agents for electronic properties. This multi-functionality reduces the need for multiple separate additives, simplifying the overall formulation while maintaining stability.
Solution Approach 2:
The patent enables the nanoparticle-solvent system to self-stabilize through inherent chemical interactions. The semiconductor nanoparticles and solvent are selected to have compatible chemical properties that naturally prevent aggregation without requiring excessive external stabilizers. The system's own composition provides the stabilization mechanism, reducing formulation complexity.
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 ink exhibits improved stability, preserved electronic properties, and enhanced fluorescence, enabling efficient use in optoelectronic devices and other applications like photovoltaics and security technologies, with a viscosity range suitable for diverse printing methods.
Implementation Method 1
The ZnO-based ink according to the present invention, once deposited, is characterized by its work function or WF. The work function is the energy required for an electron to go from the Fermi level to the vacuum level. That obtained according to the present invention is stable and constant with temperature and regardless of the support on which the ink is deposited. The mean measured value is preferably of the order of 3.9+/-0.5 eV
Implementation Method 2
conservation of fluorescence properties
Data Source
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AI summary
Nanoparticle-based ink composition. The present invention relates to nanoparticle-based ink formulations. In particular, the present invention relates to (semi-)conductive nanoparticle-based ink compositions suitable for different printing methods.