A turn-on fluorescent probe for Hg2+ detection by using gold nanoparticle-based hybrid microgels
| Autor: | Yecang Tang, Ting Wu, Yi Ding, Liying Lv, Zhicheng Yan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Detection limit
Chemistry Metal ions in aqueous solution Metals and Alloys Analytical chemistry Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Förster resonance energy transfer Adsorption Materials Chemistry Molecule Electrical and Electronic Engineering 0210 nano-technology Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 228:767-773 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2016.01.112 |
| Popis: | Hybrid microgels with Au nanoparticles (AuNPs) immobilized in poly(N-isopropylacrylamide-co-2-(dimethylamino)ethylmethacrylate) (P(NIPAM-co-DMA)) microgels have been prepared. The as-synthesized hybrid microgels showed excellent thermo- and pH-responsive properties and high stabilities. 1-pyrenebutyric acid (PBA) molecules were then adsorbed on the AuNP surfaces via electrostatic interactions to form PBA-AuNPs/P(NIPAM-co-DMA) composites that were used as probes for the detection of Hg2+. The fluorescence of PBA was effectively quenched through fluorescence resonance energy transfer between AuNPs and PBA molecules. However, the addition of Hg2+ ions caused the fluorescence turn-on dramatically and 16 times fluorescence enhancement was obtained, which is attributed the fact that Hg2+ ions replace the adsorbed PBA molecules. Under the optimal conditions, the fluorescence intensity was proportional to the concentration of Hg2+ ions in the range of 0.16–1.60 μM with a detection limit of 31 nM. Meanwhile, some other metal ions did not interfere with the detection of Hg2+, suggesting a good selectivity for Hg2+ ions sensing. |
| Databáze: | OpenAIRE |
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