Microreactor-Assisted Printing of Conductive Silver Traces
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Solution Overview
Problem
Current methods for synthesizing silver nanoparticle inks for electronics and energy devices require stringent reactant selection, stability, and costly post-sintering processes, limiting the efficiency and cost-effectiveness of silver feature production, especially in achieving high conductivity at low temperatures.
Innovation Solution
A continuous-flow microreactor-assisted printing technique using a modified Tollens' process generates in-situ reactive silver precursor inks without organic stabilizers, allowing for room temperature fabrication of highly conductive silver features through controlled reaction kinetics and flow rates, enabling direct deposition onto substrates without post-processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional silver nanoparticle inks with organic stabilizers are used, then stable ink suspension is achieved, but post-sintering process is required to remove organic stabilizers at high temperatures
Solution Approach 1:
The patent removes organic stabilizers from the ink formulation entirely, replacing them with inorganic stabilizing agents. This extraction of the problematic organic component eliminates the need for high-temperature post-sintering while maintaining ink suspension stability during storage and printing.
Solution Approach 2:
The patent changes the chemical composition parameters of the ink by substituting organic stabilizers with inorganic alternatives and adjusting the pH range to 8-12. This parameter change enables the ink to remain stable without requiring high-temperature processing to remove organic residues.
2Reliability
If post-sintering process is used to remove organic stabilizers, then conductive silver features are obtained, but additional power sources and facilities are required
Solution Approach 1:
The patent employs inorganic stabilizing agents that allow the ink to self-stabilize without requiring external post-sintering equipment. The inorganic stabilizers maintain suspension stability inherently, eliminating the need for additional furnaces, power sources, and complex processing facilities while still producing reliable conductive features.
3Duration of action of stationary object
If stringent reactant selection and stable ink formulation are used, then shelf-life is ensured, but synthesis procedures become tedious and cost increases
Solution Approach 1:
The patent uses readily available inorganic stabilizing agents such as citrate salts and chloride salts that can be easily synthesized or obtained. These simple, inexpensive inorganic compounds provide sufficient stability for commercial shelf-life requirements without requiring complex synthesis procedures or stringent reactant selection, thereby reducing manufacturing complexity and cost.
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 method produces highly conductive silver films and features at room temperature with uniformity and high crystallinity, achieving conductivity values close to half that of bulk silver, while eliminating the need for post-sintering processes and reducing material costs.
Implementation Method 1
A continuous-flow microreactor-assisted printing technique using a modified Tollens' process generates in-situ reactive silver precursor inks
Implementation Method 2
allowing for room temperature fabrication of highly conductive silver features through controlled reaction kinetics and flow rates
Implementation Method 3
The resulting silver ink can be printed directly onto a surface to form highly conductive silver features without any post processing steps
Implementation Method 4
This method produces highly conductive silver films and features at room temperature with uniformity and high crystallinity
Data Source
AI summary
Highly conductive silver may be fabricated at room temperature using in-situ reactive silver precursor inks by microreactor-assisted printing without any post-processing. Reactive silver nanoinks, synthesized in-situ from the microreactor, may be directly delivered onto glass and polymeric substrates without any surface treatment to form a highly dense and uniform silver feature. The distribution of the reactive silver nanoinks can be controlled by adjusting the flow rate of the continuous flow. Silver lines may be fabricated using the in-situ reactive precursors delivered via a micro-channel applicator.