Key Laboratory of Colloid and Interface Chemistry of State Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China.
Mikrochim Acta. 2018 Feb 5;185(3):157. doi: 10.1007/s00604-018-2718-5.
An array consisting of homogeneous NiCoS hollow core-shell nanoneedles was fabricated and is shown to enable sensitive electrochemical determination of dopamine (DA). The array was grown directly on a nickel foam (NF) substrate by a two-step hydrothermal process. The hierarchical nanoarray consists of a homogeneous NiCoS nanoneedle core and a NiCoS nanosheet shell. A 3-dimensional micro/nano structure is formed due to the presence of the micropores of the NF. The electrode was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Compared to a plain NF electrode, the NiCoS-modified NF electrode displays higher electrocatalytic activity for the oxidation of DA by differential pulse voltammetry (DPV). The sensor, best operated at a typical working voltage of 134 mV (vs. saturated calomel electrode), has a linear response in the 0.5-100 μM DA concentration range and a 0.2 μM detection limit (at S/N = 3). The electrode is selective over ascorbic acid and uric acid. Graphical abstract Schematic presentation of an electrochemical sensor for selective determination of dopamine based on the use of a homogeneous NiCoS hollow core-shell nanoneedle array on nickel foam.
一种由均一的 NiCoS 空心核壳纳米针组成的阵列被制备出来，并被证明能够对多巴胺（DA）进行灵敏的电化学测定。该阵列通过两步水热法直接在镍泡沫（NF）基底上生长。分层纳米阵列由均匀的 NiCoS 纳米针核和 NiCoS 纳米片壳组成。由于 NF 的微孔的存在，形成了三维微/纳米结构。通过扫描电子显微镜、透射电子显微镜、X 射线衍射和 X 射线光电子能谱对电极进行了表征。与普通 NF 电极相比，NiCoS 修饰的 NF 电极通过差分脉冲伏安法（DPV）显示出对 DA 氧化更高的电催化活性。该传感器在典型工作电压 134 mV（相对于饱和甘汞电极）下最佳工作，在 0.5-100 μM DA 浓度范围内具有线性响应，检测限为 0.2 μM（S/N = 3）。该电极对抗坏血酸和尿酸具有选择性。
