Study on long-term and stable imaging approach of SECCM using microfluid pressure drive

WANG Zhiwu; ZHUANG Jian; NING Shaohui; CHENG Lei; ZHENG Qiangqiang

doi:10.37188/OPE.20243210.1528

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Study on long-term and stable imaging approach of SECCM using microfluid pressure drive

Micro/Nano Technology and Fine Mechanics | 更新时间：2024-06-11

- Study on long-term and stable imaging approach of SECCM using microfluid pressure drive
- Optics and Precision Engineering Vol. 32, Issue 10, Pages: 1528-1537(2024)
- 作者机构：
  
  1.太原科技大学机械工程学院，山西太原 030024
  2.西安交通大学机械工程学院，陕西西安 710049
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20243210.1528
  CLC： TH742
- Published：25 May 2024，
  
  Received：17 October 2023，
  
  Revised：20 February 2024，
- 稿件说明：
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王志武,庄健,宁少慧等.微流体压力驱动的扫描电化学池显微镜长时间稳定成像[J].光学精密工程,2024,32(10):1528-1537.

WANG Zhiwu,ZHUANG Jian,NING Shaohui,et al.Study on long-term and stable imaging approach of SECCM using microfluid pressure drive[J].Optics and Precision Engineering,2024,32(10):1528-1537.
王志武,庄健,宁少慧等.微流体压力驱动的扫描电化学池显微镜长时间稳定成像[J].光学精密工程,2024,32(10):1528-1537. DOI： 10.37188/OPE.20243210.1528.

WANG Zhiwu,ZHUANG Jian,NING Shaohui,et al.Study on long-term and stable imaging approach of SECCM using microfluid pressure drive[J].Optics and Precision Engineering,2024,32(10):1528-1537. DOI： 10.37188/OPE.20243210.1528.

摘要

为了提升扫描电化学池显微镜（SECCM）对复杂形貌表面电化学活性成像能力，以及避免探针尖端微液滴蒸发和结晶，进而实现长时间、稳定成像，构建了基于纳米移液管探针微流体压力驱动的扫描电化学成像系统。对探针尖端开口处的微液滴流量补偿、复杂表面形貌同步电化学活性成像可靠性等进行了研究。首先，构建了基于移液管探针微流体压力驱动的SECCM扫描成像系统。接着，建立了移液管微流体压力驱动的探针检测数值模型，研究了探针末端背压与探针尖端流体流量间的关系。然后，在理论模型分析的基础上，实验测试了微流体驱动新方法对具有较大表面形貌特征的玻碳电极材料和铝合金材料表面高分辨率形貌和电化学活性同步成像能力。实验结果表明：新方法可对硬质材料表面（样品表面高度起伏为探针开口直径20倍以上）实现长时间、稳定的电化学成像。新系统的研制将为研究人员在材料电化学、金属材料腐蚀研究提供强有力的工具。

Abstract

To enhance the imaging capability （achieve long-term and stable imaging） and avoid the evaporation 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 imaging 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 surface topography imaging also was conducted. Firstly， a SECCM imaging system with a microfluidic pressure-driven was constructed. Then， a probe detection-based numerical model that use microfluidic pressure-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-resolution 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 system will provide researchers with powerful tools for studying material electrochemistry and metal material corrosion.

关键词

扫描电化学池显微镜局部高分辨率循环伏安测量形貌电化学活性

Keywords

scanning electrochemical cell microscopylocalized and high-resolutioncyclic voltammetrytopographyelectrochemical activity

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