Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 2, Pages 1330-1336Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am405430t
Keywords
conjugated polymers; sensors; fluorescence; polyquinoxaline; nerve agents
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) [2012R1A2A2A01004979]
- Korean government
- National Research Foundation of Korea [2012R1A2A2A01004979] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Conjugated polymer of poly(fluorene-co-quinoxaline) was synthesized via Suzuki coupling polymerization. The emission color of the polymer can be tuned depending on the concentration of the polymer in solution. A low-energy bandgap is observed both in the concentrated solution and in the solid state, caused by aggregation of the polymer chains, resulting in long wavelength emission from the quinoxaline moiety, while short wavelength emission can be seen in diluted, well-dissolved solution. The presence of quinoxaline units enables us to demonstrate fluorescence switching and imaging. Paper-based strips containing the polymer are prepared via simple immersion of filter paper in the polymer solution for practical use in the detection of nerve agents. The emission of the paper-based strip is quenched upon exposure to diethyl chlorophosphate (DCP), a nerve agent simulant, and the initial emission intensity can be almost restored by treatment with aqueous sodium hydroxide solution, making a possible reversible paper-based sensor.
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