کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
744504 | 894389 | 2007 | 8 صفحه PDF | دانلود رایگان |
Glassy carbon electrode modified by hydrophobic gold nanoparticles was prepared by simply and rapidly attaching octadecylamine-capped gold nanoparticles onto the glassy carbon electrode surface (denoted as C18NH2-Nano-Au/GCE), which was characterized by X-ray photoelectron spectroscopy (XPS) and attenuated total reflection (ATR)-FTIR. The electrocatalytic oxidation of ethamsylate on the C18NH2-Nano-Au/GCE was investigated by means of cyclic voltammetry. The experimental results showed that the octadecylamine-capped gold nanoparticles exhibited a better electrocatalytic activity to ethamsylate, which reduced the oxidation overpotential about 66 mV with obviously increased current response. Under the optimal conditions, there was a good linear relationship between anodic peak current and ethamsylate concentration in the range of 1.0 × 10−8 to 1.0 × 10−5 M with the detection limit of 3.5 × 10−9 M (S/N = 3) in the presence of cetyltrimethyl ammonium bromide (CTAB) by differential pulse voltammetry. The anodic peak current of successive 20 measurements on the identical surface and the renewed ones (n = 10) of C18NH2-Nano-Au/GCE were examined with the relative standard deviation of 3.1% and 3.9%, respectively. It indicated that the chemically modified electrode showed good stability and reproducibility. The proposed method has been used to determine the ethamsylate concentration in biological fluids with satisfactory results.
Journal: Sensors and Actuators B: Chemical - Volume 128, Issue 1, 12 December 2007, Pages 258–265