Solution-Processed Structural Color Metal-Dielectric-Metal Coatings
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Solution Overview
Problem
Conventional methods for producing structural color pigments are limited by reliance on vacuum-based deposition techniques and complex patterning processes, making them unsuitable for large-scale, cost-effective production and vulnerable to UV radiation and high temperatures.
Innovation Solution
A solution-based process for forming metal-dielectric-metal (MDM) structural color components using electroless deposition for metal layers and sol-gel processes for dielectric layers, allowing for sequential deposition without external electric fields, on various substrates, including plastics, with specific pH control and silanizing treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum-based deposition techniques are used to form structural color pigments, then manufacturing precision and reliability are improved, but device complexity and production cost increase, limiting large-scale production
Solution Approach 1:
The patent replaces vacuum-based physical vapor deposition with solution-based electroless deposition and sol-gel processes. This substitution eliminates the need for complex vacuum systems while achieving comparable or superior structural color pigment quality through chemical deposition mechanisms that occur in liquid phase at atmospheric pressure.
Solution Approach 2:
The patent employs solution-based processes where metal and dielectric layers are deposited from liquid precursors using electroless deposition and sol-gel techniques. This hydraulic approach using liquid chemistry replaces the pneumatic/vacuum-based physical deposition, enabling simpler equipment and scalable manufacturing while maintaining precise thickness control.
2Ease of manufacture
If conventional organic dyes are used for color pigments, then ease of manufacture is improved, but reliability and long-term stability deteriorate due to vulnerability from UV radiation and high temperatures
Solution Approach 1:
The patent creates composite metal-dielectric-metal multilayer structures that combine inorganic materials with superior UV and thermal stability. This composite approach maintains the ease of solution-based manufacturing while achieving long-term reliability by replacing organic dye molecules with stable inorganic metal and dielectric layers that resist degradation from environmental factors.
3Ease of manufacture
If micrometer-scale thicknesses are used for dye-based components, then ease of manufacture is improved, but device complexity increases due to required thickness control for distinctive colors
Solution Approach 1:
The patent changes the deposition parameter regime from micrometer-scale thick dye layers to nanometer-scale inorganic layers. By using electroless deposition and sol-gel processes, the patent achieves precise thickness control at the nanometer level, enabling distinctive colors with much thinner layers while simplifying the overall device structure through the high refractive index contrast of inorganic materials.
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 enables robust, long-term stable, and cost-effective production of structural colors with controlled thickness and morphology, achieving conformal coatings on different substrates and expanding color gamut beyond conventional MDM structures.
Implementation Method 1
The at least one metal layer may be deposited via electroless deposition
Implementation Method 2
the dielectric layer(s) may be deposited by one or more sol-gel processes
Data Source
AI summary
Methods of forming a structural color metal-dielectric-metal (MDM) component via a solution-based process are provided. First, a first metal layer is formed over a treated surface of a substrate by a first electroless deposition process. A surface of the treated substrate is contacted with a first plating bath that comprises a metal selected from the group consisting of: copper, aluminum, silver, alloys, and combinations thereof. A dielectric layer, for example, comprising silicon dioxide, is then deposited over the first metal layer by a sol-gel process. Next, the method comprises forming a second metal layer over the dielectric layer by a second electroless deposition process by contacting the dielectric layer with a second plating bath having a neutral pH and comprising a metal selected from the group consisting of: copper, aluminum, silver, alloys, and combinations thereof.