A scalable route to prepare core–shell structured ZnO@PEDOT nanowires and PEDOT nanotubes and their properties as electrode materials
A scalable route to prepare core–shell structured ZnO@PEDOT nanowires and PEDOT nanotubes and their properties as electrode materials
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DOI：
10.1016/j.apsusc.2016.02.159
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发表时间：
2016-05
影响因子：
6.7
通讯作者：
Fang Wang;Xianhong Zhang;Yang Le;De-Zhong Xu;Yuhong Ma;Dong Chen;Li Wang;Changwen Zhao;Wantai Yang
中科院分区：
文献类型：
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作者：
Fang Wang;Xianhong Zhang;Yang Le;De-Zhong Xu;Yuhong Ma;Dong Chen;Li Wang;Changwen Zhao;Wantai Yang
制备了以ZnO为核、导电聚（3，4-乙撑二氧噻吩）（PEDOT）为壳的核壳结构纳米线复合材料。首先，采用水热法制备了直径为80-100 nm，长度为4-5 μm的六方ZnO纳米线。然后通过原子转移自由基聚合法在ZnO纳米线表面接枝一层厚的聚甲基丙烯酸三氟乙酯-嵌段-聚苯乙烯磺酸钠（PTFEMA-b-PSSNa）。最后，以ZnO@PTFEMA-b-PSSNa为模板，PSSNa链为反掺杂剂，在模板表面沉淀PEDOT，形成ZnO@PEDOT/PSSNa复合材料。随着EDOT聚合的评价，PEDOT层的厚度稳定地增加。当EDOT/ZnO比例大于1：2时，由于EDOT氧化聚合过程中酸性的增加，ZnO纳米线模板最终溶解，生成PEDOT颗粒。在这种情况下，产物是纳米管和PEDOT/PPSNa颗粒的混合物。采用循环伏安法、恒流充放电和电化学阻抗谱技术研究了不同结构复合材料的电化学容量。在20 mV/s时，ZnO@PEDOT电极的最大比电容可达101.34 F/g。
A composite of a core–shell structured nanowires with ZnO as a core and conductive poly(3,4-ethylenedioxythiophene) (PEDOT) as a shell was prepared. At first, the hexagonal ZnO nanowires, with diameter of about 80–100 nm and length 4–5 μm, were fabricated by hydrothermal synthesis process. Then a thick layer of poly(trifluoroethyl methacrylate)-block-poly(sodium styrene sulfonate) (PTFEMA-b-PSSNa) was grafted from the surface of ZnO nanowires via atom transfer free radical polymerization. At last, with the ZnO@PTFEMA-b-PSSNa as a template and the PSSNa chain as the counterion dopant, PEDOT was precipitated onto the surface of the template to form the composite of ZnO@PEDOT/PSSNa. With the evaluation of the EDOT polymerization, the thickness of the PEDOT layer increased steadily. However, as the ratio of EDOT/ZnO was greater than 1:2, the ZnO nanowires templates were dissolved at last and then PEDOT particles were produced due to increasing of the acidity during the oxidation polymerization of EDOT. In this case, the product was the mixture of the nanotubes and particles of PEDOT/PPSNa. The electrochemical capacitances of the composites with different structures were investigated with cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy techniques with three-electrode cell configuration. The maximum specific capacitance of ZnO@PEDOT electrode can reach 101.34 F/g at 20 mV/s.