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在单体电化学的研究中,提高信号分辨能力是一项挑战.缩小电极尺寸有利于对体系噪音电流的控制,有望提高电流的分辨能力.本研究制备了直径为480 nm的铂纳米圆盘电极,选用银纳米颗粒碰撞电极产生银电化学氧化行为作为模型,考察了纳米电极相对于微米电极在单体电化学信号分辨能力上的优化作用.研究表明,不同尺寸电极上观察到的银纳米颗粒的碰撞频率符合扩散控制的碰撞规律.说明单个电流信号对应于单个纳米颗粒的电化学氧化过程.同时,当电极尺寸缩小至纳米尺度后,噪音电流下降50%左右,提高了对银纳米颗粒碰撞电极过程中氧化电流的分辨能力.研究结果表明使用纳米电极能进一步提高对单体电化学中微小电流的检测能力.
It is a challenge to improve signal resolution in monolithic electrochemical research.It is a good idea to reduce the electrode size to control the noise current in the system and to improve the resolution of the current.In this study, a platinum nano-disk with a diameter of 480 nm Electrode, the silver electrochemical oxidation behavior of the silver nanoparticle colliding electrode was chosen as a model to investigate the optimization of the electrochemical signal resolution of the nanometer electrode relative to the micrometer electrode. The results show that the Ag nanowires The collision frequency of the particles conforms to the diffusion-controlled collision rule, indicating that the single current signal corresponds to the electrochemical oxidation process of a single nanoparticle. At the same time, when the electrode size is reduced to nanometer scale, the noise current decreases by about 50% The resolution of the oxidation current during the collision of the electrodes.The results show that the use of nano-electrodes can further improve the detection of micro-current in the monomer electrochemical.