期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 239, 期 -, 页码 343-351出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.08.025
关键词
Polyethyleneimine; Reduced graphene oxide; Anionic dye; Fluorescence sensor; Metal cations
资金
- Atatfirk University Scientific Research Project Council [2015/23]
Polyethyleneimine (PEI)-modified reduced graphene oxide (rGO) based fluorescent sensor is reported for metal-ion sensing. PEI-rGO nanocomposites are synthesized by a facile and controllable method using hydrazine hydrate as a main reducing agent and PEI that is a reducing agent, surface modifier and polymer host. The formation of PEI-rGO nanocomposites is confirmed with X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, UV-vis spectroscopy, Zeta potential measurements and Dynamic Light Scattering (DLS) analysis. Afterward, the interaction of fluorescein (FL) with PEI-rGO nanocomposites in aqueous dispersion, leading to the formation of FL/PEI-rGO ternary system, are studied at various conditions by using UV-vis absorption, steady-state and time-resolved fluorescence spectroscopies. It is observed that the photophysical properties of FL are dependent on the amount of both FL and PEI-rGO nanocomposites. The sensing ability of FL/PEI-rGO ternary system are examined in the detection of metal ions as a fluorescent sensor. The spectroscopic data reveal that the FL/PEI-rGO ternary system shows high sensitivity and selectivity for Fe3+ ions in aqueous solution. The detection limit for Fe3+ are determined to be 1.12 mu M. (C) 2016 Elsevier B.V. All rights reserved.
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