Journal
SENSORS
Volume 14, Issue 2, Pages 3543-3556Publisher
MDPI
DOI: 10.3390/s140203543
Keywords
electrospinning; copper; carbon composite nanofibers; laccase biosensor; catechol detection; electrochemical properties
Funding
- National Natural Science Foundation of China [21201083]
- National High-tech RAMP
- D Program of China [2012AA030313]
- Changjiang Scholars and Innovative Research Team in University [IRT1135]
- Priority Academic Program Development of Jiangsu Higher Education Institutions, Industry-Academia-Research Joint Innovation Fund of Jiangsu Province [BY2012068]
- Science and Technology Support Program of Jiangsu Province [SBE201201094]
- Innovation Program for Graduate Education in Jiangsu Province [CXZZ13_07]
- Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices [13XKL01002]
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The study compared the biosensing properties of laccase biosensors based on carbon nanofibers (CNFs) and copper/carbon composite nanofibers (Cu/CNFs). The two kinds of nanofibers were prepared by electrospinning and carbonization under the same conditions. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopy were employed to investigate the morphologies and structures of CNFs and Cu/CNFs. The amperometric results indicated that the Cu/CNFs/laccase(Lac)/Nafion/glass carbon electrode (GCE) possessed reliable analytical performance for the detection of catechol. The sensitivity of the Cu/CNFs/Lac/Nafion/GCE reached 33.1 A/mM, larger than that of CNFs/Lac/Nafion/GCE. Meanwhile, Cu/CNFs/Lac/Nafion/GCE had a wider linear range from 9.95 x 10(-6) to 9.76 x 10(-3) M and a lower detection limit of 1.18 M than CNFs/Lac/Nafion/GCE. Moreover, it exhibited a good repeatability, reproducibility, selectivity and long-term stability, revealing that electrospun Cu/CNFs have great potential in biosensing.
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