期刊
ANALYTICAL LETTERS
卷 53, 期 7, 页码 1034-1052出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2019.1693583
关键词
Differential pulse voltammetry (DPV); electrochemical sensor; human blood serum; multi-walled carbon nanotube; pencil graphite electrode (PGE); poly(3; 4-ethylenedioxythiophene); serotonin
In this study, acid-activated multi-walled carbon nanotubes (AA-MWCNT) and poly(3,4-ethylenedioxythiophene) (PEDOT) were deposited on a pencil graphite electrode (PGE) surface for electrochemical sensing applications. The acid-activated multi-walled carbon nanotube/over-oxidized poly(3,4-ethylenedioxythiophene) modified pencil graphite electrode (AA-MWCNT/OO-PEDOT/PGE) was characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The sensing properties of the obtained surface were examined for the voltammetric determination of serotonin in a phosphate buffer solution. The effects of the pH, adsorption time, over-oxidation and polymerization parameters on the electrochemical properties of serotonin were investigated. The effects of possible interfering substances were evaluated. The detection limit was determined to be 0.092 mu M based on a signal-to-noise ratio of 3. Analytical applications of AA-MWCNT/OO-PEDOT/PGE were successfully tested for the determination of serotonin in human blood serum samples.
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