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Self-Assembled Photonic Microsensors with Strong Aggregation-Induced Emission for Ultra-Trace Quantitative Detection
Qiu-Jun Liu1, Yulian Li2, Jing-Cheng Xu2
1School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
ACS Nano
|February 24, 2021
Summary
This study introduces novel photonic porous microspheres for ultratrace detection. These microspheres enable highly sensitive fluorescence-based quantification of nitrophenol compounds at ppb levels in environmental samples.
Area of Science:
- Materials Science
- Analytical Chemistry
- Nanotechnology
Background:
- Ultratrace quantitative detection using fluorescence is crucial for environmental monitoring and disease diagnosis.
- Challenges exist in detecting analytes at ultralow concentrations due to limited fluorescence responses.
- Existing methods often struggle with sensitivity and specificity at parts-per-billion (ppb) levels.
Purpose of the Study:
- To develop a novel microsensor for highly sensitive ultratrace quantitative detection.
- To circumvent limitations of traditional fluorescence-based detection methods.
- To enable accurate detection of nitrophenol compounds at ppb levels in aqueous environments.
Main Methods:
- Fabrication of photonic porous microspheres grafted with aggregation-induced emission (AIE) gens.
- Utilizing a porous structure with interconnected nanopores for enhanced analyte diffusion.
- Incorporating a poly(ethylene oxide) (PEO) layer for analyte enrichment via hydrogen bonding.
- Employing a single-step synthesis method templated by double emulsion droplets stabilized by AIE amphiphilic bottlebrush block copolymers.
Main Results:
- The microspheres exhibit dual structural color and strong fluorescence properties.
- Significant fluorescence quenching was observed for nitrophenol compounds at ultralow concentrations (10⁻¹²–10⁻⁸ mol/L).
- Quantitative detection of nitrophenol compounds at ppb levels (ng/L) was successfully achieved.
- The porous structure, PEO enrichment layer, and homogeneous AIEgen distribution contribute to enhanced detection sensitivity.
Conclusions:
- The developed photonic porous microspheres offer a promising platform for ultratrace fluorescence detection.
- The microsensor design effectively addresses challenges in sensitivity and analyte enrichment.
- This technology holds potential for applications in environmental monitoring and disease diagnostics requiring high sensitivity.
