【摘要】 为了加快银纳米线材料的合成速度,在制备过程中利用L-半胱氨酸作为反应过程中形成Ag2S胶体的硫源,将合成银纳米线的前驱体硝酸银的浓度提高到了1 mol/L,利用扫描电子显微镜、透射电子显微镜和X射线衍射仪对制备的银纳米线材料进行了表征,利用循环伏安法和电化学阻抗法对银纳米线修饰的铂电极电化学性能进行了研究.结果表明:L-半胱氨酸的引入可以明显降低体系中硝酸的浓度,提高银纳米线的产量,使得银纳米线的合成时间降低到20 min;电化学实验结果表明:制备的银纳米线材料具备良好的电子传递能力、较大的比表面积和较强的电化学性能,利用这些特点有望改善无酶传感器的性能.更多还原

【Abstract】 In order to speed up the synthesis of silver nanowires( Ag NWs),L-cysteine was used as a sulfur source in the preparation of Ag2 S colloid,and the concentration of the precursor silver nitrate was increased to 1 mol/L. Scanning electron microscopy( SEM),transmission electron microscopy( TEM)and X-ray diffraction( XRD) were employed to characterize the prepared nanowires. The electrochemical properties of Ag NWs modified Pt( Ag NWs/Pt) electrode were evaluated by cyclic voltammetry( CV) and electrochemical impedance spectroscopy( EIS). The results indicate that the introduction of L-cysteine can significantly reduce the concentration of nitric acid and improve the yield of silver nanowires,and that the synthesis time of silver nanowires was decreased to 20 min. The Ag NWs/Pt electrode might be gifted from CV scanning with higher surface area and more active sites that provide more effective surface exposure in the electrode-electrolyte interface and consequently electrochemical properties were improved.The excellent electron transfer capability,large specific surface area and excellent electrochemical performance of the silver nanowires are expected to improve the performance of the enzyme free sensor.更多还原