AbstractThe authors describe the fabrication of an interconnected edge-exposed graphene nanostructure via chemical vapor deposition (CVD) of foliated graphene onto a network of alumina nanofibers. The fibers such obtained are shown to enable ultra-sensitive voltammetric determination of dopamine (DA), uric acid (UA) and ascorbic acid (AA). The electrode displays powerful and persistent electro oxidative behavior and excellent electron transport properties. Cyclic voltammetry and differential pulse voltammetry demonstrate excellent selectively and sensitivity for AA, DA and UA, with typical peaks at −0.08 V, +0.19 V, and +0.34 V (vs. SCE), respectively. Under optimum conditions, the calibration plots are linear in the 1–80 μM range for DA, in the 1–60 μM range for UA, and in the 0.5–60 μM range for UA, with detection limits of 0.47 μM, 0.28 μM and 0.59 μM, respectively. The sensor was successfully applied to the simultaneous determination of DA and UA in the presence of AA in spiked urine sample. Graphical abstractMaterial with high density of graphene foliates grown over highly aligned nano-dimensional ceramic fibers is used as electrode for simultaneous highly sensitive electrochemical determination of DA in the presence of UA and AA with a considerably low limit of detection.

中文翻译：

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基于石墨烯涂层氧化铝电极的超灵敏伏安法同时测定多巴胺、尿酸和抗坏血酸

摘要作者描述了通过化学气相沉积 (CVD) 在氧化铝纳米纤维网络上的叶状石墨烯制备互连边缘暴露的石墨烯纳米结构。如此获得的纤维显示出能够对多巴胺 (DA)、尿酸 (UA) 和抗坏血酸 (AA) 进行超灵敏伏安测定。该电极显示出强大而持久的电氧化行为和优异的电子传输性能。循环伏安法和差分脉冲伏安法对 AA、DA 和 UA 表现出出色的选择性和灵敏度，典型峰分别位于 -0.08 V、+0.19 V 和 +0.34 V（相对于 SCE）。在最佳条件下，校准曲线在 DA 的 1–80 μM 范围内、UA 的 1–60 μM 范围内和 UA 的 0.5–60 μM 范围内呈线性，检测限为 0.47 μM，0. 分别为 28 μM 和 0.59 μM。该传感器成功应用于在加标尿样中 AA 存在的情况下同时测定 DA 和 UA。图形摘要在高度对齐的纳米维陶瓷纤维上生长的具有高密度石墨烯叶状体的材料用作电极，用于在 UA 和 AA 存在下以相当低的检测限同时高灵敏度电化学测定 DA。