Metallic Nanoparticle Dispersion Stabilizing Heteroaromatic Rings
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Solution Overview
Problem
Current metallic nanoparticle dispersions used in inkjet printing face challenges with stability and conductivity, requiring high sintering temperatures that are not compatible with common polymeric substrates like PET, limiting the choice of materials and increasing production costs.
Innovation Solution
A metallic nanoparticle dispersion comprising metallic nanoparticles, a liquid carrier, and a non-polymeric dispersion-stabilizing compound with specific heteroaromatic rings, which enhances stability and conductivity, allowing for moderate curing conditions and use on flexible substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polymeric dispersants with full decomposition temperature of at least 350°C are used to stabilize metallic nanoparticle dispersions, then dispersion stability is improved, but sintering temperature must be elevated to at least 350°C which is not compatible with common polymer foils like PET
Solution Approach 1:
The invention changes the chemical composition parameter of the dispersant from conventional polymeric dispersants (decomposition temperature ≥350°C) to heteroaromatic dispersants with specific ring structures (imidazole, oxazole, thiazole, triazole, tetrazole rings) that have lower decomposition temperatures, enabling sintering at moderate temperatures (100-250°C) compatible with PET substrates while maintaining dispersion stability
Solution Approach 2:
The invention uses composite heteroaromatic structures combining specific ring systems (imidazole, oxazole, thiazole, triazole, or tetrazole rings) with dispersant functionalities to create a new class of dispersants that simultaneously provide stable nanoparticle dispersion and enable low-temperature sintering, resolving the contradiction between stability and temperature compatibility
2Stability of the object's composition
If conventional polymeric dispersants are used to prevent nanoparticle agglomeration, then dispersion stability is improved, but organic components reduce sintering efficiency and conductivity of applied patterns
Solution Approach 1:
The invention changes the chemical structure parameter of the dispersant to heteroaromatic compounds with specific ring systems that facilitate more complete decomposition at lower temperatures, reducing residual organic content and improving the conductivity and reliability of the final sintered patterns while maintaining dispersion stability during processing
3Stability of the object's composition
If high sintering temperatures are used to decompose polymeric dispersants, then dispersion stability is maintained, but the choice of substrates is restricted to expensive polymers like polyimide and production costs increase
Solution Approach 1:
The invention changes the thermal decomposition parameter of the dispersant by using heteroaromatic structures with lower decomposition temperatures, enabling the use of low-cost, high-volume substrates like PET (glass transition temperature around 70-80°C) that cannot withstand high sintering temperatures, thereby improving ease of manufacture and reducing production costs while maintaining dispersion stability
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 solution provides stable and conductive coatings or patterns at lower sintering temperatures, enabling the use of cost-effective polymeric substrates like PET and improving the efficiency of the printing process.
Implementation Method 1
Polymeric dispersants typically contain in one part of the molecule so-called anchor groups, which adsorb onto the metallic particles to be dispersed
Implementation Method 2
after applying the metallic printing or coating fluids on a substrate, a sintering step, also referred to as curing step, at elevated temperatures is carried out to induce/enhance the conductivity of the applied patterns of layers
Data Source
AI summary
A metallic nanoparticle dispersion comprising metallic nanoparticles and a liquid carrier characterized in that the dispersion further includes a dispersion-stabilizing compound according to Formulae I, II, III or IV, wherein Q represents the necessary atoms to form a substituted or unsubstituted a five or six membered heteroaromatic ring, M is selected from the group consisting of a proton, a monovalent cationic group and an acyl group, R1 and R2 are independently selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl or heteroaryl group, a hydroxyl group, a thioether, an ether, an ester, an amide, an amine, a halogen, a ketone and an aldehyde, R1 and R2 may represent the necessary atoms to form a five to seven membered ring, R3 to R5 are independently selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl or heteroaryl group, a hydroxyl group, a thiol, a thioether, a sulfone, a sulfoxide, an ether, an ester, an amide, an amine, a halogen, a ketone, an aldehyde, a nitrile and a nitro group, R4 and R5 may represent the necessary atoms to form a five to seven membered ring.