Silver Decanoate Conductive Ink for Low-Temperature Printing
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Solution Overview
Problem
Existing conductive ink compositions often require high temperatures to form conductive structures, which can be incompatible with temperature-sensitive substrates used in flexible electronics and biomedical devices.
Innovation Solution
A particle-free conductive ink composition comprising a silver decanoate complex, where the silver decanoate is combined with a dissolving agent such as a terpene or terpenoid, and optionally an adhesion promoter and acid stabilizer, allowing for the formation of conductive structures at low temperatures (250° C. or less) without the need for catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperatures are used to form conductive structures from precursor-based inks, then electrical conductivity is improved, but substrate integrity deteriorates due to temperature sensitivity
Solution Approach 1:
The patent changes the chemical composition parameters of the ink formulation by incorporating specific polymer stabilizers and ligands that enable decarboxylation and conductive structure formation at lower temperatures (below 150°C), thus resolving the contradiction between achieving high conductivity and protecting temperature-sensitive substrates
Solution Approach 2:
The patent introduces polymer stabilizers and ligands as intermediary substances that mediate the decomposition process, allowing the silver precursor to convert to conductive silver structures at reduced temperatures without directly damaging the substrate, thereby resolving the temperature conflict
2Reliability
If particle-based inks are used to achieve high conductivity, then electrical performance is improved, but manufacturing complexity increases due to separate particle synthesis and ink formulation
Solution Approach 1:
The patent merges the particle synthesis step with the ink formulation step by using precursor-based chemistry where silver compounds are directly incorporated into the ink matrix and converted to conductive structures during processing, eliminating the need for separate particle synthesis and reducing manufacturing complexity
Solution Approach 2:
The patent performs preliminary chemical preparation by formulating the ink with pre-selected polymer stabilizers and ligands that control the decomposition and conductive structure formation processes, eliminating the need for post-printing particle synthesis and simplifying the overall manufacturing workflow
3Reliability
If low molecular weight ligands are used in silver compounds to achieve high conductivity, then electrical performance is improved, but ink compatibility deteriorates due to decomposition at processing temperatures
Solution Approach 1:
The patent changes the molecular weight parameter of the ligands by selecting high molecular weight polymer stabilizers that remain stable at ink processing temperatures, while still enabling the formation of highly conductive silver structures through controlled decomposition and reduction processes
Solution Approach 2:
The patent creates a composite ink formulation combining silver precursors with polymer stabilizers and ligands that work synergistically to provide both thermal stability during processing and high electrical conductivity in the final product, resolving the contradiction between stability and conductivity
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 composition achieves high electrical conductivity and adhesion to various substrates, with conductive structures exhibiting resistances as low as 0.5 ohms per square and bulk silver content of at least 1%, while maintaining stability and compatibility with temperature-sensitive materials.
Implementation Method 1
the silver decanoate is decarboxylated at a temperature of 250° C. or less to form a conductive structure
Implementation Method 2
a silver decanoate complex, where the silver decanoate is combined with a dissolving agent such as a terpene or terpenoid
Data Source
AI summary
Improved conductive ink compositions are provided. The improved conductive ink compositions include a silver complex formed by mixing a silver carboxy late, specifically a silver decanoate isomer, and at least one dissolving agent, in particular where the at least one dissolving agent comprises a terpene, a terpenoid; or a combination thereof. The silver carboxy late of the subject ink compositions is decarboxylated at a temperature of 250° C. or less, optionally in the presence of an adhesion promoter and/or an acid stabilizer, to form a conductive structure. Methods of making conductive structures, including methods wherein the disclosed compositions are applied to a substrate by various techniques, are also provided.