Abstract
Niobium (Nb) and nitrogen (N) co-doped diamond-like carbon (DLC) film ((Nb:N)-DLC) was fabricated by reactive magnetron sputtering. Atomic force microscopy, Raman spectra and X-ray photoelectron spectroscopy were used to characterize the morphology, microstructure, and composition of the (Nb:N)-DLC film. The (Nb:N)-DLC film has typical DLC characteristics with enlarged and uniform specific surface area. Electrochemical tests show that the proposed co-doped DLC electrode not only presents fast apparent rate constant (1.92 × 10−2 cm s−1), low charge transfer resistance (13.86 Ω cm2), but also possesses excellent electrochemical reversibility and stability in K3Fe(CN)6 electrolyte. Furthermore, the (Nb:N)-DLC electrode was applied to the determination of dopamine (DA) and an apparent current response to a low concentration of 0.5 μM was obtained by differential pulse voltammetry.
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