The synthesis of Ag-polypyrrole nanocomposite coated latex particles and their application as a fluorescent quenching agent |
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Authors: | Jiang-ru Zhang Teng Qiu Hong-fu Yuan Xiao-yu Li |
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Institution: | College of Materials Science and Engineering State of Key Laboratory of Organic-Inorganic Composites Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology,Beijing 100029, China |
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Abstract: | Submicron-sized Ag-polypyrrole/poly(styrene-co-methacrylic acid) (Ag-PPy/P(St-co-MAA)) composite particles were fabricated via a redox reaction between pyrrole and AgNO3 in the presence of P(St-co-MAA) soap-free latex. The products are characterized by transmission electron microscopy (TEM), electron diffraction spectra (EDS), Raman spectra, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results showed that Ag-PPy nanocomposites were in situ deposited onto the surface of P(St-co-MAA) latex particles tailored by carboxylic-acid groups. The nanocomposites of Ag-PPy distributed on the surface of polymer particles transformed from discretely dots to continuously coating as the reaction temperature increased from 15℃ to 60℃. Strawberry-like composite particles were obtained at the reaction temperature of 60℃. The TGA characterization confirmed that the Ag-PPy nanocomposites loading onto the P(St-co-MAA) particles were systematically controlled over a range of 6 wt%-42 wt% by changing the reaction temperatures. The fluorescence quenching effect of the Ag-PPy/P(St-co-MAA) composite particles was explored on Rhodamine B as a model molecule with the Stern-Völmer quenching constant KSV of 5.9×104 (g/mL)-1. It is suggested that the fluorescence quenching effect is caused by the resonance energy transfer mechanism. |
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Keywords: | Nanocomposite-coated latex particles PPy Ag nanoparticles Synthesis Fluorescence quenching |
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