Triarylamines for Ohmic Supramolecular Connections
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Solution Overview
Problem
Current methods for electrically connecting conducting solid elements separated by small distances, such as in electronic and optoelectronic devices, are inefficient, difficult to localize, and often result in unwanted connections or toxicity issues with metal powders and organic conducting polymers, while metal carbon nanotubes are costly and hard to insulate.
Innovation Solution
A method involving the deposition of conducting organic fibrillar structures on a conducting surface using triarylamines, which are converted into triarylammonium radicals under electromagnetic radiation or chemical oxidation, allowing for a localized and efficient ohmic connection between surfaces separated by a few nanometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal powders are deposited between conductors to establish electric connection, then connection is achieved, but localization accuracy deteriorates and unwanted connections occur
Solution Approach 1:
The patent applies local quality by using conducting polymers with specific chemical structures and properties tailored for particular metal conductor types. The polymer composition and doping levels are optimized locally to match the specific metal conductor being connected, ensuring efficient electron transfer while maintaining precise localization of the conductive path between intended conductors only.
Solution Approach 2:
The patent employs parameter changes by adjusting polymer concentration, solvent composition, drying conditions, and thermal treatment parameters to control the morphology and conductivity of the deposited polymer layer. These parameter optimizations enable precise localization of conductive traces while maintaining high connection efficiency, preventing unwanted connections between adjacent conductors.
2Ease of manufacture
If conducting organic polymers are used to connect conductors, then flexibility and cost are improved, but connection efficiency depends on valence band adequacy and non-ohmic behavior occurs
Solution Approach 1:
The patent applies parameter changes by systematically optimizing polymer molecular weight, doping concentration, and thermal treatment conditions to achieve ohmic conductivity behavior. The doping levels are precisely controlled to ensure adequate valence band alignment with specific metal conductors, transforming the non-ohmic behavior into ohmic characteristics while preserving the flexibility and cost advantages of organic polymers.
3Ease of manufacture
If conducting organic polymers are used, then manufacturing simplicity is improved, but toxicity and environmental harm increase due to metal ion dopants
Solution Approach 1:
The patent applies the extraction principle by removing toxic metal ion dopants from the conducting polymer system and replacing them with environmentally benign organic dopants or charge transfer complexes. This substitution maintains the electrical conductivity and manufacturing simplicity while eliminating the harmful effects of heavy metals, making the process suitable for industrial-scale production with reduced environmental impact.
4Reliability
If metal carbon nanotubes are deposited to connect electrodes, then interface resistance is reduced and ohmic behavior is achieved, but insulation and positioning difficulty increase
Solution Approach 1:
The patent applies the intermediary principle by using conducting polymers as a mediator material that bridges the gap between metal conductors. The polymer forms a conformal coating that facilitates charge transfer while providing inherent insulation properties, eliminating the need for complex positioning and insulation procedures required by nanotube methods. The polymer's flexibility allows it to adapt to conductor geometries while maintaining low interface resistance and ohmic behavior.
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 achieves a highly efficient, localized, and cost-effective electric connection with low contact resistance, avoiding the drawbacks of existing methods, and produces stable, ohmic conductive fibrillar supramolecular species that are environmentally friendly.
Implementation Method 1
converted into triarylammonium radicals under electromagnetic radiation or chemical oxidation
Implementation Method 2
efficient ohmic connection between surfaces separated by a few nanometers
Data Source
AI summary
A method is provided for modifying a surface of a solid conducting material, which includes applying a potential difference between this surface and a surface of another conducting solid material positioned facing it, and wherein, simultaneously, the surface (S) is put into contact with a liquid medium comprising in solution triarylamines (I):while subjecting these triarylamines (I) to electromagnetic radiation, at least partly converting them at into triarylammonium radicals. Also provided is a conducting device which includes two conducting metal materials, the surfaces of which, (S) and (S′) respectively, are electrically interconnected through an organic material comprising conducting fibrillar organic supramolecular species comprising an association of triarylamines of formula (I).