Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 237, Issue -, Pages 581-590Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.06.127
Keywords
Molybdenum nitride nanosheets; N-doped multi walled carbon nanotubes; Amperometric sensor; Detection of L-cysteine
Funding
- National Natural Science Foundation of China [21575021, 21405011]
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In this work, we reported a novel, facile and effective strategy by using hydrothermal reaction and following high-temperature pyrolysis under the ammonia flow to fabricate the molybdenum nitride nanosheets/N-doped multi-walled carbon nanotubes (MoN/N-MWNTs) hybrid nanocomposite. MoN/N-MWNTs nanocomposite was characterized via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and electrochemical methods. This nanocomposite exhibits excellent electrocatalytic oxidation of L-cysteine (L-CySH). An amperometric L-CySH sensor was constructed based on the MoN/N-MWNTs modified glassy carbon electrode. The as-prepared MoN/N-MWNTs nanocomposite has favourable conductivity, large surface area due to the MWNTs as supporter and highly exposed active sites of MoN. Moreover, the influence of different loading amounts of MoN was researched. The optimized MoN/N-MWNTs catalyst showed a wide detection range that was composed by two line segments (5 mu M- 0.79 mM and 0.79 mM-12.60 mM), a sensitivity of 198.59 nA mu M-1 cm(-2) in the low concentration range, a rapidly response within 1.5s as well as good reproducibility and stability. (C) 2016 Elsevier B.V. All rights reserved.
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