Abstract
Woolen ball-shaped La3+/TiO2 nanostructure (WB-S La3+/TiO2-NS) was constructed, followed by specification using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Cyclic voltammograms of this new nanocomposite sensor provided distinct and sharp oxidation peaks for the study analytes, including ascorbic acid (AA), dopamine (DA), acetaminophen (AC) and tryptophan (Try). An effective electron-mediated response of the nanosensor was determined with broad peak separations of 0.2 for AA-DA, 0.2 for DA-AC, and 0.31 V for AC-Try. According to differential pulse voltammograms, the nanostructure electrode could simultaneously detect AA, DA, AC and Try, with linear ranges from 0.001 to 900.0 μM, with the limit of detection of 0.63 ± 0.01, 0.51 ± 0.02, 0.72 ± 0.03 and 0.84 ± 0.04 nM, sequentially. Further, the analytical applicability of WB-S La3+/TiO2-NS/SPE was confirmed by sensing AA, DA, AC and Try in real human serum samples.
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