Abstract As a vehicle for simultaneous voltammetric determination of dopamine and ascorbic acid, a sandwich-structured, layered CoTMPyP/Sr2Nb3O10 nanocomposite was synthesised via exfoliation/restacking. Negatively charged Sr2Nb3O10 nanosheets were assembled with positively charged 5,10,15,20-tetrakis (N-methylpyridinium-4-yl) porphyrinato cobalt (CoTMPyP). The structure and morphology of CoTMPyP/Sr2Nb3O10 nanocomposite were characterised using XRD (X-ray diffraction), Scanning electronmicroscope (SEM), Transmission electron microscope (TEM), Energy dispersive spectrometer analysis (EDS) and Fourier transform infrared spectrometer (FTIR). The CoTMPyP/Sr2Nb3O10 nanocomposite has a layered structure with the CoTMPyP cations inserted into the interlayer spacing of the Sr2Nb3O10 nanosheets with an angle of inclination of 51.5°. Differential pulse voltammetry (DPV) and cyclic voltammetry (CV) results show that dopamine (DA) and ascorbic acid (AA) could be detected selectively and sensitively at CoTMPyP/Sr2Nb3O10/GCE (glassy carbon electrode) with peak-to-peak separation of 263 mV in the N2-saturated phosphate buffer saline (PBS, pH = 6). Electrochemical sensing towards DA and AA on CoTMPyP/Sr2Nb3O10 displays low respective detection limits of 7.6 μM and 10.6 μM, each in a wide linear range of 0.02–1.62 mM and 0.05–3.25 mM, respectively.

中文翻译：

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用于同时伏安法测定多巴胺和抗坏血酸的夹心结构层状 CoTMPyP/Sr2Nb3O10 纳米复合材料

摘要 作为同时伏安法测定多巴胺和抗坏血酸的载体，通过剥离/重堆叠合成了夹心结构的层状 CoTMPyP/Sr2Nb3O10 纳米复合材料。带负电的 Sr2Nb3O10 纳米片与带正电的 5,10,15,20-四（N-甲基吡啶-4-基）卟啉钴（CoTMPyP）组装在一起。使用XRD（X射线衍射）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能谱分析（EDS）和傅里叶变换红外光谱仪（FTIR）对CoTMPyP/Sr2Nb3O10纳米复合材料的结构和形貌进行了表征。CoTMPyP/Sr2Nb3O10 纳米复合材料具有层状结构，CoTMPyP 阳离子以 51.5° 的倾角插入 Sr2Nb3O10 纳米片的层间距中。差分脉冲伏安法 (DPV) 和循环伏安法 (CV) 结果表明，在 CoTMPyP/Sr2Nb3O10/GCE（玻碳电极）上可以选择性和灵敏地检测多巴胺 (DA) 和抗坏血酸 (AA)，峰峰分离在 N2 饱和磷酸盐缓冲盐水 (PBS, pH = 6) 中为 263 mV。CoTMPyP/Sr2Nb3O10 上对 DA 和 AA 的电化学传感显示各自的检测限低，分别为 7.6 μM 和 10.6 μM，分别在 0.02-1.62 mM 和 0.05-3.25 mM 的宽线性范围内。