微流体压力驱动的扫描电化学池显微镜长时间稳定成像OA北大核心CSTPCD

To enhance the imaging capability(achieve long-term and stable imaging)and avoid the evapo-ration and crystallization of micro-droplets at the probe tip in the scanning electrochemical cell microscopy(SECCM),a scanning electrochemical imaging system was constructed and microfluidic pressure-driven was used in its nanopipette probe end.The new system has advantages in terms of electrochemical imag-ing especially for the complex sample surface.The compensation of micro-droplet flow rate at the opening of the probe tip was studied.The research related reliability of synchronous electrochemical active and sur-face topography imaging also was conducted.Firstly,a SECCM imaging system with a microfluidic pres-sure-driven was constructed.Then,a probe detection-based numerical model that use microfluidic pres-sure-driven pipette was established,and the relationship between the back pressure and the fluid flow rate at the back and tip of the probe was studied.Furthermore,with the theoretical model analysis,the novel microfluidic driving method was experimentally tested for its ability to synchronously image the high-reso-lution topography and electrochemical activity of carbon electrode materials and aluminum alloy materials with large surface morphology characteristics.The experimental results indicate that the new method can achieve long-term and stable electrochemical imaging on the surface of hard materials(with sample surface height fluctuations greater than 20 times the probe opening diameter).The development of the new sys-tem will provide researchers with powerful tools for studying material electrochemistry and metal material corrosion.