In this research, the graphene oxide nanoribbons (GONRs) were substantially synthesized by the oxidative longitudinal unzipping of the multi‐walled carbon nanotubes (MWCNTs). Then, a direct electrochemical technique was employed for reducing GONRs adsorbed on the screen printed carbon electrode (SPCE). Electrochemical reduction effectively eliminated the oxygen‐containing groups in the GONRs and produced the electrochemically reduced graphene nanoribbons (ERGNRs). Field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), and X‐ray diffraction (XRD) were employed to characterize the materials. The modified SPCE with ERGNRs (ERGNRs/SPCE) displayed acceptable electrocatalytic characteristics towards the oxidation of dopamine (DA) and uric acid (UA) and applied to the simultaneous determination of these two analytes. ERGNRs/SPCE has a peak potential difference of 245 mV between DA and UA. The anodic peak currents of DA and UA were linear within the concentration ranges between 0.5 and 300.0 μM and 1.0 to 400.0 μM in phosphate buffer (pH=7.0) respectively. The detection limit of the technique for DA is 0.15 μM (S/N=3) and for UA is 0.3 μM (S/N=3). The proposed approach has been applied to the determination of DA and UA in real samples and generated acceptable outputs.

中文翻译：

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电化学还原石墨烯纳米带处理过的丝网印刷电极，用于在尿酸存在下灵敏伏安法测定多巴胺

在这项研究中，氧化石墨烯纳米带（GONRs）是通过多壁碳纳米管（MWCNTs）的氧化纵向解链而基本上合成的。然后，直接电化学技术用于减少吸附在丝网印刷碳电极（SPCE）上的GONRs。电化学还原有效消除了GONR中的含氧基团，并产生了电化学还原的石墨烯纳米带（ERGNR）。场发射扫描电子显微镜（FE‐SEM），透射电子显微镜（TEM）和X射线衍射（XRD）用来表征材料。带有ERGNRs的改性SPCE（ERGNRs / SPCE）对多巴胺（DA）和尿酸（UA）的氧化表现出可接受的电催化特性，并用于同时测定这两种分析物。ERGNRs / SPCE在DA和UA之间的峰值电势差为245 mV。在磷酸盐缓冲液（pH = 7.0）中，DA和UA的阳极峰值电流分别在0.5至300.0μM和1.0至400.0μM的浓度范围内呈线性。该技术对DA的检测限为0.15μM（S / N = 3），对于UA为0.3μM（S / N = 3）。所提出的方法已经应用于实际样品中DA和UA的测定，并产生了可接受的输出。