Abstract Au@Pt nanoflowers supported on graphene oxide (Au@Pt/GO) nanocomposites were synthesized for enhanced electrochemical sensing of dopamine (DA). Au@Pt/GO nanocomposites were synthesized through a facile wet-chemical co-reduction method and the nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrum (EDS), X-ray diffraction spectroscopy (XRD) and electrochemical techniques. SEM and TEM results showed that large numbers of Au@Pt nanoflowers with Au cores and Pt dendritic shells were distributed on the surface of GO sheets, which made Au@Pt/GO modified electrode exhibit an excellent performance toward DA detection with a wide linear range of 0.5 μM to 0.1775 mM, a high sensitivity of 329.0 μA mM−1 cm−2 and a low detection limit of 0.11 μM (S/N = 3). Moreover, the sensor also displayed good selectivity, accepted reproducibility and stability. Therefore, these results indicated that Au@Pt/GO nanocomposite was a promising sensing material for DA detection.

中文翻译：

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氧化石墨烯负载 Au@Pt 纳米花的合成增强多巴胺的电化学传感

摘要 合成负载在氧化石墨烯 (Au@Pt/GO) 纳米复合材料上的 Au@Pt 纳米花以增强多巴胺 (DA) 的电化学传感。Au@Pt/GO 纳米复合材料通过简便的湿化学共还原方法合成，纳米复合材料通过扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、能量色散 X 射线光谱 (EDS)、X射线衍射光谱 (XRD) 和电化学技术。SEM和TEM结果表明，GO片表面分布着大量具有Au核和Pt树枝状壳的Au@Pt纳米花，这使得Au@Pt/GO修饰电极表现出优异的DA检测性能，具有较宽的线性范围0.5 μM 至 0.1775 mM，329.0 μA mM-1 cm-2 的高灵敏度和 0.11 μM 的低检测限（S/N = 3）。此外，该传感器还表现出良好的选择性、公认的重现性和稳定性。因此，这些结果表明Au@Pt/GO纳米复合材料是一种很有前途的DA检测传感材料。