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An ionic liquid-assisted quantum dot-grafted covalent organic framework-based multi-dimensional sensing array for
Ying Zhang1, Dianwei Zhang1, Yuan Zhao1
1Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University (BTBU), No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
A new sensing array using quantum dot-grafted covalent organic frameworks and ionic liquid can identify seven insecticides. This robust method utilizes optical fingerprints for distinct detection, offering a promising tool for insecticide determination.
Area of Science:
- Materials Science
- Analytical Chemistry
- Nanotechnology
Background:
- Development of advanced sensing arrays is crucial for environmental monitoring.
- Covalent organic frameworks (COFs) offer tunable properties for sensing applications.
- Quantum dots (QDs) provide unique optical characteristics for signal transduction.
Purpose of the Study:
- To establish a robust multi-dimensional sensing array for insecticide identification.
- To enhance detection efficiency using ionic liquids and COFs.
- To generate distinct optical fingerprints for discriminating multiple insecticides.
Main Methods:
- One-pot synthesis of quantum dot-grafted covalent organic frameworks (QD-grafted COFs) anchored with VBimBF4B/MAA.
- Utilizing fluorescence, phosphorescence, and light scattering channels for multi-dimensional signal output.
- Applying principal component analysis (PCA) and clustered heat map analysis for data interpretation.
Main Results:
- The sensing array demonstrated physicochemical and thermal stability with a large specific surface area.
- Successful identification of seven insecticides via non-specific interactions and kinetic differences.
- Discrimination of insecticide fingerprints at 200 μg L⁻¹ with a broad detection range (0.001-0.4 μg mL⁻¹).
- Achieved low limits of detection (1.08-18.68 μg L⁻¹) and acceptable spiked recovery rates (79.86-134.22%) in tap water.
Conclusions:
- The developed multi-dimensional sensing array offers a promising approach for sensitive and selective insecticide determination.
- The synergistic effect of COFs and ionic liquids enhances detection capabilities.
- This study expands the application scope of sensing array technology in environmental analysis.
