Particle-Free Gold Ink Composition for Low-Temperature Conductive Printing
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Solution Overview
Problem
Existing conductive inks based on gold(I) phosphine complexes require high decomposition temperatures, making them incompatible with substrates that require low processing temperatures, such as plastic and paper used in flexible electronics and biomedical devices.
Innovation Solution
Development of particle-free conductive ink compositions using gold(I) metal ions stabilized by organophosphite ligands and specific solvents, allowing curing at temperatures below 400°C, enabling compatibility with a wide range of substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gold(I) phosphine complexes are used as conductive ink precursors, then high electrical conductivity can be achieved, but high decomposition temperatures (>400°C) are required which damage temperature-sensitive substrates
Solution Approach 1:
The patent changes the ligand parameter from phosphine to phosphite, which fundamentally alters the thermal stability characteristics of the gold complex while maintaining its conductivity potential. This parameter substitution allows the complex to decompose at lower temperatures suitable for plastic and paper substrates
Solution Approach 2:
The invention creates a composite coordination complex combining gold(I) with phosphite ligands and specific counterions (BF4-, PF6-, CF3SO3-). This composite structure achieves a balance between thermal stability for ink formulation and controlled decomposability for low-temperature processing, resolving the contradiction between conductivity and temperature requirements
2Reliability
If particle-based conductive inks are used, then high conductivity can be achieved, but the particles require separate synthesis and ink formulation tuning which increases manufacturing complexity
Solution Approach 1:
The patent extracts the separate particle synthesis step by using molecular gold complexes that directly decompose to form conductive networks. This eliminates the need to synthesize metal particles separately and then formulate them into inks, simplifying the manufacturing process while maintaining conductivity
Solution Approach 2:
The gold complexes are pre-synthesized with specific ligands and counterions that control their decomposition behavior. This preliminary structuring ensures they will decompose at the right temperature and form conductive networks directly, eliminating the need for subsequent particle processing and ink formulation tuning
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 compositions achieve high conductivity at low temperatures, maintaining stability during ultrasonication and forming conductive structures suitable for flexible electronics and biomedical devices.
Implementation Method 1
the particle-free conductive ink composition forms a conductive metallic film by curing at no more than 400° C.
Implementation Method 2
Precursor-based inks are based on thermally unstable precursor complexes that undergo reduction to a conductive metal upon heating.
Data Source
AI summary
Conductive ink compositions comprising gold complexes are provided. Also provided are methods of preparing the conductive ink compositions, methods of forming conductive structures from the conductive ink compositions, and structures formed from the conductive ink compositions. The conductive ink compositions preferably comprise a gold metal, an organophosphite ligand, and a solvent and are preferably particle-free. The conductive ink compositions can be used to form conductive structures comprising gold, for example by inkjet or other printing methods, at temperatures of 400° C. or less. Such conductive structures can be formed on a variety of substrates.