期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 14, 页码 7568-7574出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00675a
关键词
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资金
- China West Normal University [12B017]
- Major Project of Education Department in Sichan [14ZA0125]
- National Natural Science Foundation of China [11104303]
- Chinese Academy of Sciences [KGZD-EW-303, XDA02040000]
We demonstrate a new semiconducting polymer dot: the poly(o-phenylenediamine)-Rhodamine B copolymer dot (Pp-RhB dot), which emits in the red wavelength range. The Pp-RhB dots can be used as an ultrasensitive fluorescence probe for NO2- in vivo and show high selectivity and ultrasensitivity (detection limit: 2.0 x 10(-11) M) for NO2-. The fluorescence of Pp-RhB dots is decreased (phi = 0.014) as a result of fast photoinduced electron transfer (PET) between the modulator (poly(o-phenylenediamine)) and the transducer (RhB), but the N-NO2 bonding mode prevents PET, causing the fluorescence emission to be enhanced (phi = 0.92). This probe effectively avoids the influence of auto-fluorescence in biological systems and gave positive results when tested in both aqueous solution and living
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