3D Substrate Particle Assembly for Uniform Plasmonic Layered Products
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Solution Overview
Problem
Existing methods for producing structures with metal-based particle assemblies lack efficiency and control in forming plasmonic structures with localized plasmon resonance for enhanced fluorescence applications.
Innovation Solution
A method involving immersing a substrate with a three-dimensional surface in a plating solution containing a metal cation to form a metal-based particle assembly layer, where the volume ratio of substrate to solution is controlled at 0.03 or less, with specific conditions for particle diameter, distance, and growth rate, followed by optional formation of a protective insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the substrate is immersed in a plating solution with high metal cation concentration to form metal-based particle assembly layer, then the particle formation speed increases, but the particles aggregate and the localized plasmon resonance effect deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the metal cation concentration in the plating solution and the substrate volume ratio (VS/VL ≤ 0.03). By optimizing these parameters, the invention achieves uniform particle distribution and maintains localized plasmon resonance effects while ensuring efficient particle formation on the three-dimensional substrate surface.
2Manufacturing precision
If the substrate volume ratio to plating solution is increased to improve particle assembly density, then the particle assembly layer becomes more uniform, but the localized plasmon resonance effect is reduced
Solution Approach 1:
The patent resolves this contradiction by establishing a specific parameter range: the substrate volume ratio (VS/VL) must be 0.03 or less. This parameter control ensures that sufficient space remains in the plating solution for proper particle distribution, maintaining both assembly uniformity and the localized plasmon resonance effect necessary for fluorescence enhancement.
3Illumination intensity
If the metal-based particle diameter is increased to enhance plasmon resonance, then the resonance effect improves, but the particle assembly density decreases
Solution Approach 1:
The patent optimizes particle diameter as a key parameter, specifying that metal-based particles should have a diameter of 5 nm to 1600 nm. This parameter range balances the plasmon resonance effect with particle assembly density, ensuring both effective fluorescence enhancement and sufficient particle concentration on the substrate surface.
4Quantity of substance
If the average distance between adjacent particles is decreased to increase assembly density, then the particle count increases, but the localized plasmon resonance effect deteriorates
Solution Approach 1:
The patent establishes an optimal parameter range for average particle distance (1 nm to 150 nm) that simultaneously achieves sufficient assembly density and maintains localized plasmon resonance effects. This parameter optimization ensures that particles are close enough to form a functional assembly while remaining distant enough to preserve individual plasmon resonance characteristics.
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
Facilitates the creation of a layered product with controlled plasmonic structures that enhance fluorescence intensity and improve sensor element sensitivity, quantitative accuracy, and reproducibility.
Implementation Method 1
forming the metal-based particle assembly layer on the three-dimensional surface by immersing the substrate in a plating solution containing a cation of a metal constituting the metal-based particles to reduce the cation
Implementation Method 2
A technique exploiting localized plasmon resonance phenomenon of metal nanoparticles for enhanced fluorescence is known
Data Source
AI summary
The present invention provides a novel method for producing a structure comprising an assembly of metal-based particles. Provided is a method for producing a layered product, the layered product comprising a substrate having a three-dimensional surface; and a metal-based particle assembly layer arranged on the three-dimensional surface and comprising a plurality of metal-based particles arranged apart from each other, the method comprising the step of forming the metal-based particle assembly layer on the three-dimensional surface by immersing the substrate in a plating solution containing a cation of a metal constituting the metal-based particles to reduce the cation, wherein a VS/VL ratio of volume VS [cm3] of the substrate to volume VL [cm3] of the plating solution is 0.03 or less.