Core-Shell Nanocomposite for Aggregation-Induced Emission
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Solution Overview
Problem
Conventional fluorophores face limitations such as poor photostability and aggregation-induced quenching, restricting their applications in bioimaging and other fields, and existing methods for fluorescence color change, like Förster resonance energy transfer, are limited by strict requirements on distance and energy levels between fluorophores.
Innovation Solution
A core-shell nanocomposite is formed by depositing a second fluorophore capable of aggregation-caused quenching onto a first fluorophore capable of aggregation-induced emission, allowing for dual fluorescence properties and a new mechanism of fluorescence color change upon aggregation, which can be synthesized using metal nanoclusters and biomolecules in a simple, green, and biocompatible process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluorophores are used, then fluorescence emission is achieved, but photostability is poor and aggregation causes fluorescence quenching
Solution Approach 1:
The fluorophore system is segmented into two distinct components: a core fluorophore exhibiting aggregation-induced emission (AIE) and a shell fluorophore exhibiting aggregation-caused quenching (ACQ). This segmentation allows each component to perform its specific function - the AIE core provides stable fluorescence while the ACQ shell prevents aggregation-induced quenching, thereby resolving the contradiction between maintaining fluorescence and preventing aggregation quenching.
Solution Approach 2:
The invention creates a composite nanocomposite structure combining two different fluorophore types with opposite aggregation behaviors. The core-shell composite architecture integrates the AIE properties of the core fluorophore with the ACQ properties of the shell fluorophore, enabling the system to maintain high fluorescence intensity and photostability even when aggregated, thus overcoming the limitations of conventional single fluorophore systems.
2Adaptability or versatility
If FRET is used for fluorescence color change, then color change between two fluorophores is achieved, but strict requirements on distance and energy level restrict fluorophore availability
Solution Approach 1:
The invention changes the fundamental parameter governing fluorescence color change from energy transfer (FRET) to aggregation state. By utilizing the opposite aggregation behaviors of AIE and ACQ fluorophores, the system achieves color change through physical aggregation or dispersion rather than requiring precise control of inter-fluorophore distance and energy levels, thereby simplifying the system while expanding fluorophore compatibility.
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 nanocomposite exhibits enhanced fluorescence in aggregated form and reduced fluorescence in dispersed form, offering a new color change mechanism and potential applications in biosensing and bioimaging with high bio-compatibility and uptake efficiency in mammalian cells.
Implementation Method 1
forming a core comprising a first fluorophore capable of aggregation induced emission
Implementation Method 2
depositing a second fluorophore capable of aggregation caused quenching onto the surface of the core
Data Source
AI summary
The present invention relates to a method for forming a nanocomposite having a core-shell structure, the method comprising the steps of: forming a core comprising a first fluorophore capable of aggregation induced emission, and depositing a second fluorophore capable of aggregation caused quenching onto the surface of the core to form a shell at least partially surrounding the core. The present invention also relates to a nanocomposite obtained by said method, and a method of altering the fluorescence of said nanocomposite. The nanocomposite may exhibit dual emission colours and opposite aggregation fluorescent behaviours.