Abstract A promising and low-cost electrochemical sensor was carried out with carbon nanotube modified carbon-fiber electrodes via vapor deposition method, which improved the sensitivity and reduced the detection limit of dopamine. In virtue of various techniques, such as SEM and Raman spectroscopy, the morphological, structural and crystalline properties of composites were analyzed. Moreover, simultaneous determination of dopamine, ascorbic acid and uric acid was explored at the modified carbon fiber electrode. The presence of carbon nanotubes on the surface of carbon fiber can effectively increase the surface area and electron transfer velocity of the interaction between neurotransmitter and electrode. The good linear responses of ascorbic acid, dopamine and uric acid were obtained in the range of 25.6–2000.3 μM, 5.0–120.6 μM and 20.0–800.0 μM with detection limits (S/N = 3) of 10.0 μM, 0.03 μM and 0.6 μM, respectively. Finally, this sensor was applied to the determination of dopamine in some real sample.

中文翻译：

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碳纳米管/碳纤维电极通过化学气相沉积同时测定抗坏血酸、多巴胺和尿酸

摘要 以碳纳米管修饰的碳纤维电极通过气相沉积法制备了一种有前景的低成本电化学传感器，提高了灵敏度并降低了多巴胺的检测限。借助扫描电镜和拉曼光谱等多种技术，对复合材料的形态、结构和结晶特性进行了分析。此外，还探索了在改性碳纤维电极上同时测定多巴胺、抗坏血酸和尿酸。碳纤维表面存在碳纳米管，可以有效增加神经递质与电极相互作用的表面积和电子传递速度。在 25.6-2000.3 μM、5.0-120.6 μM 和 20.0-800 范围内获得了抗坏血酸、多巴胺和尿酸的良好线性响应。0 μM，检测限 (S/N = 3) 分别为 10.0 μM、0.03 μM 和 0.6 μM。最后，将该传感器应用于实际样品中多巴胺的测定。