Highly Dispersible and Stable Copper Terephthalate Metal-Organic Framework-Graphene Oxide Nanocomposite for an Electrochemical Sensing Application
Highly Dispersible and Stable Copper Terephthalate Metal-Organic Framework-Graphene Oxide Nanocomposite for an Electrochemical Sensing Application
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DOI：
10.1021/am5019918
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发表时间：
2014-07-23
影响因子：
9.5
通讯作者：
Guo, Hongxu
中科院分区：
文献类型：
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作者：
Wang, Xia;Wang, Qingxiang;Guo, Hongxu
采用简单的超声法制备了高分散、稳定的Cu（tpa）-GO（Cu（tpa）=对苯二甲酸铜金属有机骨架，GO =氧化石墨烯）纳米复合材料。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、紫外-可见光谱（UV-vis）、傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和热重分析（TGA）对复合材料的形貌和结构进行了表征。根据表征结果，推测Cu（tpa）与GO的结合机理为π-π堆积、氢键和Cu-O配位的协同作用。通过将Cu（tpa）-GO复合物浇铸在玻碳电极（GCE）上，然后通过电还原处理将复合物中的GO转化为高导电还原形式（电化学还原石墨烯，EGR）来研究Cu（tpa）-GO复合物的电化学传感性能。结果表明，由于EGR的高电导率和Cu（tpa）独特的电子介导作用的协同作用，改性材料显著改善了对乙酰氨基酚（ACOP）和多巴胺（DA）两种药物的电化学信号和峰形。在最佳条件下，ACOP和DA的氧化峰电流分别与其浓度在1-100 μ M和1-50 μ M范围内呈线性关系。ACOP和DA的检测限估计分别低至0.36和0.21 μ M。
A highly dispersible and stable nanocomposite of Cu(tpa)-GO (Cu(tpa) = copper terephthalate metal organic framework, GO = graphene oxide) was prepared through a simple ultrasonication method. The morphology and structure of the obtained composite were characterized via scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis, Fourier-transform infrared (FT-IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). On the basis of the characterization results, the binding mechanism of the Cu(tpa) and GO was speculated to be the cooperative interaction of pi-pi stacking, hydrogen bonding, and Cu-O coordination. The electrochemical sensing property of Cu(tpa)-GO composite was investigated through casting the composite on a glassy carbon electrode (GCE), followed by an electro-reduction treatment to transfer the GO in the composite to the highly conductive reduced form (electrochemically reduced graphene, EGR). The results demonstrated that the electrochemical signals and peak profiles of the two drugs of acetaminophen (ACOP) and dopamine (DA) were significantly improved by the modified material, owing to the synergistic effect from high conductivity of EGR and unique electron mediating action of Cu(tpa). Under the optimum conditions, the oxidation peak currents of ACOP and DA were linearly correlated to their concentrations in the ranges of 1-100 and 1-50 mu M, respectively. The detection limits for ACOP and DA were estimated to be as low as 0.36 and 0.21 mu M, respectively.