期刊
MICROCHIMICA ACTA
卷 187, 期 5, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-020-4223-x
关键词
Graphene nanomaterials; Graphene-nanoparticle conjugates; Magnetite nanoparticles; Enzymatic biosensors; FESEM; XPS; ATR-FTIR; Cyclic voltammetry; Square wave voltammetry; Electrochemical impedance spectroscopy; Chronoamperometry
资金
- European (FEDER)
- National Portuguese funds (COMPETE program) [Pest-C/EQB/LA0006/2013, PTDC/EME-MFE/103051]
- National Portuguese funds (POPH program) [Pest-C/EQB/LA0006/2013, PTDC/EME-MFE/103051]
- Fundacao para a Ciencia e a Tecnologia de Portugal (FCT) [SFRH/BD/111274/2015, SFRH/BPD/109537/2015]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/111274/2015] Funding Source: FCT
A hybrid conjugate of reduced graphene oxide/ferrous-ferric oxide nanoparticles (rGO-Fe3O4 NPs) is characterized and assembled with chitosan and laccase to form a layered functional superstructure. After its characterization by field-effect scanning electron microscopy, energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, attenuated total reflectance Fourier transform infrared, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS), the nanocomposite has been deposited on glassy carbon for the enzyme-mediated electrochemical determination of the endocrine disruptor bisphenol A (BPA). Proof-of-concept assays conducted by using CV, EIS, and square wave voltammetry reveal that the enzymatic biosensor provides linear response in a wide range of BPA concentrations (6-228 ppb), very high sensitivities, and excellent durability (over 1-month storage). Using amperometric detection, remarkable sensitivities (2080 mu A mu M-1 cm(-2)) and detection limits (18 nM) are attained. Applications to real samples of bottled water proved feasible with recoveries in the range 107-124%.
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