Wrinkled Elastomeric Electrode Nanoparticle Bonding
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Solution Overview
Problem
Conventional stretchable electrodes face challenges in achieving high electrical conductivity and mechanical stability due to low stretchability of metals, high contact resistance, and unstable bonding between conductive components and elastomers, making them unsuitable for various shaped and large-area substrates.
Innovation Solution
A wrinkled elastomeric electrode is developed by coating densely packed metal nanoparticles on a stretchable substrate, using a method that involves dipping the substrate into a dispersion of metal nanoparticles and a monomolecular material with amine groups, forming a bilayer structure that enhances bonding and reduces contact resistance, allowing for high electrical conductivity and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional stretchable electrodes are fabricated through structural design of bulk metals to impart stretchability, then mechanical stretchability is improved, but electrical conductivity deteriorates due to intrinsic low stretchability of metals
Solution Approach 1:
The electrode is segmented into discrete metal nanoparticles rather than continuous bulk metal. This segmentation allows the electrode to stretch by changing the configuration and spacing of nanoparticles while maintaining conductive pathways, resolving the contradiction between stretchability and electrical conductivity.
Solution Approach 2:
The invention uses a composite structure combining metal nanoparticles with elastomeric materials and monomolecular layers. This composite approach enables both the stretchability of elastomers and the electrical conductivity of metal nanoparticles to coexist, overcoming the limitations of pure metal structures.
2Stability of the object's composition
If composites of conductive materials (carbon nanotubes) and stretchable elastomers are prepared, then mechanical stretchability is improved, but electrical conductivity deteriorates due to high contact resistance between neighboring conductive components
Solution Approach 1:
A monomolecular layer acts as an intermediary between metal nanoparticles and the elastomeric substrate. This intermediate layer improves the bonding and reduces contact resistance between nanoparticles, enabling both high stretchability and high electrical conductivity to be achieved simultaneously.
Solution Approach 2:
The invention changes the physical and chemical parameters at the interface between conductive components and elastomer by introducing functionalized monomolecular layers. This parameter optimization reduces contact resistance while maintaining mechanical stretchability, overcoming the limitations of conventional carbon-based composites.
3Reliability
If thermal annealing and/or strong mechanical pressing are applied to lower contact resistance, then electrical conductivity is improved, but mechanical stability deteriorates due to unstable bonding between conductive components and elastomers
Solution Approach 1:
The monomolecular layer is deposited on metal nanoparticles before final electrode assembly, creating pre-optimized bonding interfaces. This preliminary functionalization ensures stable bonding between conductive components and elastomers from the outset, eliminating the need for subsequent thermal annealing or mechanical pressing that could compromise mechanical stability.
Solution Approach 2:
The invention replaces mechanical pressing and thermal annealing processes with a chemical bonding approach using functionalized monomolecular layers. This substitution achieves low contact resistance through chemical bonding rather than mechanical compression, preserving the mechanical stability of the elastomeric substrate.
4Ease of manufacture
If conventional techniques are used to prepare stretchable electrodes, then manufacturing simplicity is maintained, but adaptability deteriorates as these techniques are difficult to apply to various shaped and large-area substrates
Solution Approach 1:
The dip-coating method using colloidal metal nanoparticle suspensions is a universal technique that can be applied to substrates of any shape, size, or complexity. This single versatile method replaces multiple specialized fabrication processes, enabling both manufacturing simplicity and broad adaptability to various shaped and large-area substrates.
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 enables the elastomeric electrode to maintain high electrical conductivity and mechanical stability under mechanical deformations, such as bending, stretching, and compression, and can be applied to various shaped and large-area substrates without additional treatments like thermal annealing or mechanical pressing.
Implementation Method 1
dipping a stretchable substrate into a first dispersion including metal nanoparticles dispersed in a first organic solvent
Implementation Method 2
form a metal nanoparticle layer on the swollen substrate
Implementation Method 3
to swell the substrate and form a metal nanoparticle layer on the swollen substrate
Implementation Method 4
contract the substrate, leaving wrinkles on the surface of a bilayer
Implementation Method 5
gold (Au) nanoparticles stabilized with tetraoctylammonium bromide (TB)
Implementation Method 6
some surface ligands of the metal nanoparticles may be eliminated by exchange with functional groups on the one surface of the substrate
Implementation Method 7
some of the uneliminated surface ligands of the metal nanoparticles may be eliminated by exchange with the amine groups of the monomolecular material
Data Source
AI summary
The elastomeric electrode includes: a stretchable substrate 10 having wrinkles formed on one surface thereof, the peaks C and valleys T of the wrinkles being repeated; a wrinkled metal nanoparticle layer 20 including metal nanoparticles 21 and formed by deposition of the metal nanoparticles along the wrinkles of the substrate 10; and a wrinkled monomolecular layer 30 including a monomolecular material having one or more amine groups (—NH2) and formed by deposition of the monomolecular material onto the metal nanoparticle layer 20. Also disclosed is a method for preparing the elastomeric electrode.