聚苯胺具有低廉的价格、简单的制备方法、良好的环境稳定性、特殊的掺杂/去掺杂特性和良好的化学稳定性等特点,是一种良好的电化学传感材料。采用循环伏安法在含苯胺的硫酸电解液中合成了不同段数的纤维状聚苯胺(PANI)/不锈钢复合电极,通过扫描电子显微镜、X射线衍射仪和傅里叶变换红外光谱仪对材料的形貌和结构进行表征,探讨了合成条件对材料形貌和结构的影响;通过循环伏安法、恒电流充放电和差分脉冲伏安法对制备的复合电极的电化学性能和传感性能进行测试。结果表明:50段合成的PANI/不锈钢复合电极与60段合成的复合电极比电容相差不大;合成段数为50段和60段的PANI/不锈钢复合电极所构建的无酶传感器检测葡萄糖的线性范围分别为0.5～3.3mmol/L和3.9～10.5mmol/L,线性相关系数R2分别为0.99287和0.99203,灵敏度分别为590.3μA/[(mmol·L-1)·cm2]和157.6μA/[(mmol·L-1)·cm2]。
Polyaniline (PANI) is a good electrochemical sensing material,owing to its low price,simple preparation method,excellent environmental stability,special doping/dedoping characteristics and good chemical stability.Fibrous PANI/stainless steel composite electrodes with different segment numbers were prepared in aniline-containing sulfuric acid electrolyte by cyclic voltammetry (CV) in this paper.The morphology and structure of the materials were characterized by scanning electron microscopy (SEM),X-ray diffractometer (XRD) and Fourier transform infrared spectroscopy (FT-IR),and the effects of synthesis conditions on the morphology and structure of the materials were explored.The electrochemical property and electrochemical sensing performance of as-prepared composite electrodes were measured through CV,CP and DPV.The results indicated that the specific capacitance of PANI/stainless steel composite electrodes synthesized with 60 segments was not much different from that of PANI synthesized with 50 segments.The linear range of the enzyme-free sensor constructed by PANI/stainless steel composite electrodes synthesized with 50 segments and 60 segments were 0.5～3.3mmol/L and 3.9～10.5mmol/L,with linear correlation coefficients R2 of 0.99287 and 0.99203,respectively,and the corresponding sensitivities were 590.3μA/[(mmol·L-1)·cm2] and 157.6μA/[(mmol·L-1)·cm2],respectively.
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基金资助
玉林市科学研究与技术开发计划(玉市科202324143)
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