Raman-Active Core-Shell Nanoparticles with Carboxyl Reporters
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Solution Overview
Problem
Existing Raman-active particles face issues with toxicity, chemical instability, and reduced reproducibility due to the use of nitro group-containing Raman reporters, limiting their application in biofields and affecting detection reliability and sensitivity.
Innovation Solution
A Raman-active nanoparticle with a core-shell structure and self-assembled monolayers containing Raman reporters with specific functional groups, forming uniform nanogaps and surface irregularities, enhancing SERS activity and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Raman reporter containing a nitro group is used, then Raman activity is achieved, but toxicity increases and biocompatibility deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the Raman reporter by replacing the nitro group with a carboxyl group. This structural modification maintains the Raman activity while eliminating the toxic effects associated with nitro groups, thereby improving biocompatibility for in vivo and in vitro applications
Solution Approach 2:
The patent employs a stable, non-toxic carboxyl group-based Raman reporter that can be used repeatedly without degradation or toxic accumulation, replacing the limited-use nitro group reporters that lose stability and generate toxicity over time
2Ease of manufacture
If a Raman reporter with reduced chemical stability is used, then ease of synthesis is improved, but side reactions increase and reliability deteriorates
Solution Approach 1:
The patent changes the chemical stability parameter by selecting a carboxyl group instead of less stable functional groups. The carboxyl group provides excellent chemical stability that prevents side reactions while maintaining ease of synthesis through well-established conjugation methods with plasmonic metal surfaces
3Object-affected harmful factors
If a core-shell structure with self-assembled monolayer is used, then biocompatibility is improved, but device complexity increases
Solution Approach 1:
The patent implements a nested core-shell structure where the Raman reporter-containing self-assembled monolayer is nested on the surface of the plasmonic metal core. This nested architecture provides biocompatibility and stability while maintaining relatively simple fabrication through sequential self-assembly processes
Solution Approach 2:
The patent employs self-assembled monolayers that automatically organize and stabilize the core-shell structure without requiring complex external assembly procedures. The self-assembly process occurs spontaneously under controlled conditions, reducing the need for complex manufacturing equipment and procedures while achieving excellent biocompatibility
4Measurement precision
If uniform nanogaps are formed in the core-shell structure, then SERS activity is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the self-assembling nature of the monolayer to automatically form uniform nanogaps between the core and shell structures. This self-organization process occurs without requiring precision control equipment, as the molecular self-assembly naturally produces consistent spacing that enhances SERS activity while avoiding complex manufacturing precision requirements
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 achieves uniform Raman activity, improved sensitivity for single molecule detection, and reliable detection of biomarkers with enhanced reproducibility and biocompatibility, suitable for in-vivo and in-vitro applications.
Implementation Method 1
a first self-assembled monolayer that binds to each of the core and the shell, is positioned between the core and the shell
Implementation Method 2
Surface-enhanced Raman spectroscopy (SERS) is Raman spectroscopy utilizing a phenomenon in which a Raman scattering signal of molecules adsorbed on a microstructure of a metal surface is enhanced
Data Source
AI summary
A Raman-active nanoparticle of the present disclosure includes a spherical plasmonic metal core; a plasmonic metal shell having surface irregularities; and a first self-assembled monolayer that binds to each of the core and the shell, is positioned between the core and the shell, and includes a Raman reporter satisfying the following Chemical Formula 1: