Fluoralkylated Carbon Quantum Dots via Solvothermal Pyrolysis
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Solution Overview
Problem
Existing methods for fluorinating carbon quantum dots, such as those using Freon or perfluoroacyl peroxides, face issues with solubility and stability at high temperatures, limiting their effective synthesis and application.
Innovation Solution
A solvothermal pyrolysis process using a fluoroorganic molecular compound with a labile functional group is employed to graft fluorine-containing groups onto carbon quantum dots, allowing for stable and efficient fluorination, even at moderate temperatures, and enabling the formation of fluoralkylated carbon quantum dots with unique spectral and hydrophobic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Freon or perfluoroacyl peroxides are used for fluorinating carbon quantum dots, then fluorine-containing groups are introduced to the surface, but the carbon quantum dots lose solubility and form slurry at high treatment temperatures
Solution Approach 1:
The invention changes the treatment temperature parameter from high temperature (100-200°C in prior art) to moderate temperature (20-80°C), which prevents loss of solubility while still enabling effective fluorination through the labile functional group mechanism
Solution Approach 2:
The invention utilizes the phase transition behavior of the labile functional group (X) which decomposes at moderate temperatures to release active fluorine species, enabling surface modification without requiring high temperature treatment that would cause aggregation
2Reliability
If high temperature treatment is used for fluorination, then fluorine-containing groups are successfully grafted to the carbon material surface, but the process complexity and energy consumption increase
Solution Approach 1:
The invention replaces thermal energy input (high temperature heating) with chemical energy input (labile functional group decomposition), allowing fluorination to proceed at moderate temperatures through the exothermic decomposition of the X group
Solution Approach 2:
The fluoroorganic compound is pre-equipped with a labile functional group that will automatically decompose at moderate temperatures to release active fluorine species, eliminating the need for subsequent high temperature treatment
3Ease of manufacture
If perfluoroacyl peroxides are used as fluorine source, then fluorination occurs easily due to peroxide bond decomposition, but the method is limited to high temperature conditions
Solution Approach 1:
The labile functional group (X) acts as an intermediary that mediates between the stable fluoroorganic compound and the carbon quantum dot surface, enabling fluorine transfer at moderate temperatures through its decomposition to active species
Solution Approach 2:
The labile functional group (X) is designed to be a short-living, easily decomposable component that sacrifices itself to release active fluorine species, enabling the fluorination reaction to proceed under mild conditions
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 produces fluoralkylated carbon quantum dots with enhanced luminescent and optical extinction properties, suitable for various applications including sensing, imaging, and energy storage, while maintaining solubility and stability, overcoming previous limitations in fluorination techniques.
Implementation Method 1
the carbon material (CM) can graft the active residues of fluoroorganic substances which are produced by homolytic decomposition
Implementation Method 2
A solvothermal pyrolysis process using a fluoroorganic molecular compound with a labile functional group is employed to graft fluorine-containing groups onto carbon quantum dots
Data Source
AI summary
The invention discloses a simple, scalable and convenient solvothermal method of obtaining fluoralkylated carbon quantum dots—Fluocar® Nano materials, by solvothermal pyrolysis of an organic substance in the presence of fluoroorganic substance that contain fluoroalkyl groups. The obtained material is water- and organic solvents soluble, grafted fluorine is hydrolytically stable, and obtained dots having intense luminescence in a wide range of wavelengths, from blue to NIR. Photoluminescent (PL) spectral map of obtained carbon dots solution is highly sensitive to pH changes and rare earth metal ions concentration in this solution. Also PL-map of such material is sensitive to organic complex moiety (e.g. Acidum salicylicum, and penicillinum).Synthesized materials can find use as the classic and fluorescent dye replacement, as the carrier of biologically active substances, for bio-imaging, theranostic, for cytological studies, (photo)catalysis, as electrode component, as well as a sensor or biosensor, or for other uses.