Polymer-Coated Nanoparticle Composite for Plasmon-Matched Fluorescence
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Solution Overview
Problem
Conventional plasmon-excited fluorescence analysis methods do not sufficiently enhance fluorescence emission by the fluorescent substance, leading to inadequate detection sensitivity due to the lack of consideration for the relationship between the absorption spectrum of the fluorescent substance and the luminous wavelength of plasmon resonance.
Innovation Solution
A nanoparticle body comprising a metallic nanoparticle covered by a polymer film, a specifically bondable substance, and a fluorescent substance, where the fluorescent substance is excited by light with a luminous wavelength of plasmon resonance in a composite formed by bonding two or more nanoparticle bodies with a test substance interposed between them, enhancing fluorescence through multipole resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fluorescent substance is selected without considering the relationship between its absorption spectrum and the luminous wavelength of plasmon resonance, then the selection process is simple, but the fluorescence emission is not sufficiently enhanced
Solution Approach 1:
The patent applies parameter changes by systematically varying the selection criteria for fluorescent substances based on the spectral overlap between absorption and emission wavelengths. Specifically, it selects fluorescent substances whose absorption spectrum overlaps with the luminous wavelength of plasmon resonance, thereby optimizing the energy transfer efficiency and enhancing fluorescence emission without adding structural complexity to the nanoparticle system.
Solution Approach 2:
The patent references and builds upon the spectral characteristics of known fluorescent substances and their absorption/emission profiles. By copying the successful spectral matching approach from established fluorescent materials and adapting it to the plasmon resonance system, the invention achieves enhanced fluorescence without requiring de novo material discovery, thus balancing performance improvement with selection simplicity.
2Illumination intensity
If the absorption spectrum of the fluorescent substance does not overlap with the luminous wavelength of plasmon resonance, then the fluorescent substance can be easily selected, but the fluorescence intensity is insufficient
Solution Approach 1:
The patent implements parameter changes by establishing specific spectral overlap criteria between the fluorescent substance absorption spectrum and the plasmon resonance luminous wavelength. This quantitative approach to spectral matching ensures that the selected fluorescent substances achieve optimal energy transfer, thereby significantly enhancing fluorescence intensity while providing clear selection guidelines that manage the complexity of spectral matching.
3Measurement precision
If conventional single-particle plasmon resonance is used for fluorescence enhancement, then the system is simple, but the fluorescence emission is not sufficiently enhanced
Solution Approach 1:
The patent applies the merging principle by combining multiple nanoparticle bodies into a composite structure where plasmon resonance interactions are enhanced through collective effects. By merging individual nanoparticle resonances into a coordinated composite system, the invention achieves significantly enhanced fluorescence emission that exceeds what single particles can provide, while maintaining a relatively simple overall architecture based on established nanoparticle composite concepts.
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 nanoparticle body effectively enhances fluorescence emission, thereby increasing detection sensitivity by optimizing the overlap between the absorption spectrum of the fluorescent substance and the plasmon resonance spectrum, improving detection accuracy.
Implementation Method 1
When the composite is irradiated with excitation light, surface plasmon resonance is induced in the metallic particles in the composite, and a near field is formed in the vicinity of the surface of the metallic particle. The near field increases the fluorescence intensity of the fluorescent substance.
Implementation Method 2
The near field increases the fluorescence intensity of the fluorescent substance.
Data Source
AI summary
A nanoparticle body comprising: a metallic nanoparticle; a polymer film covering a surface of the metallic nanoparticle; a specifically bondable substance that specifically bonds to a test substance in a specimen; and a fluorescent substance labeled on a surface of the polymer film or on the specifically bondable substance, wherein the fluorescent substance is excited by light having a luminous wavelength of plasmon resonance in a composite in which two or more of the nanoparticle body are bonded together with the test substance interposed therebetween.