Compressed Sensing Image Reconstruction of Scanning Electrochemical Microscopy Measurements Carried Out at Ultrahigh Scan Speeds Using Continuous Line Probes
Compressed Sensing Image Reconstruction of Scanning Electrochemical Microscopy Measurements Carried Out at Ultrahigh Scan Speeds Using Continuous Line Probes
复制标题
使用连续线探头以超高扫描速度进行扫描电化学显微镜测量的压缩传感图像重建
DOI：
10.1021/acs.analchem.1c01869
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发表时间：
2021
影响因子：
7.4
通讯作者：
Esposito, Daniel V.
中科院分区：
文献类型：
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作者：
Dorfi, Anna E.;Yan, Jingkai;Wright, John;Esposito, Daniel V.
以往对非局部连续线探针(CLP)扫描电化学显微镜(SECM)成像的研究表明，与基于传统超微电极(UME)圆盘电极的扫描电化学显微镜(SECM)相比，扫描电化学显微镜(SECM)能够将面积成像速度提高一个数量级。在成像过程中提高CLP的线性扫描速度提供了进一步提高成像速率的机会，但由于液体电解液中的传输过程，导致图像质量显著恶化。在这里，我们展示了压缩传感(CS)后处理可以成功地应用于基于CLP的SECM测量，在大大超过常规SECM“速度限制”的探测扫描速率下以最小的失真重建图像。通过系统地评估在不同扫描速率下采集的CLP-SECM数据的自适应后处理CS方法生成的图像的图像质量，本工作建立了CLP扫描速率的新的上限。虽然传统的扫描电子显微镜成像通常使用由PéClet Numbers(Pe)和lt；1表征的探头扫描速度，但这项研究表明，CS后处理方法可以实现准确的图像重建，Pe接近5，对应于最大探头扫描速度的数量级增加。这一上限对应于本工作中所研究的探头在电解液中出现混沌对流的开始，突出了在设计快速扫描探头时考虑流体动力学的重要性。
Previous studies on scanning electrochemical microscopy (SECM) imaging with nonlocal continuous line probes (CLPs) have demonstrated the ability to increase areal imaging rates by an order of magnitude compared to SECM based on conventional ultramicroelectrode (UME) disk electrodes. Increasing the linear scan speed of the CLP during imaging presents an opportunity to increase imaging rates even further but results in a significant deterioration in image quality due to transport processes in the liquid electrolyte. Here, we show that compressed sensing (CS) postprocessing can be successfully applied to CLP-based SECM measurements to reconstruct images with minimal distortion at probe scan rates greatly exceeding the conventional SECM ″speed limit″. By systematically evaluating the image quality of images generated by adaptable postprocessing CS methods for CLP-SECM data collected at varying scan rates, this work establishes a new upper bound for CLP scan rates. While conventional SECM imaging typically uses probe scan speeds characterized by Péclet numbers (Pe) < 1, this study shows that CS postprocessing methods can allow for an accurate image reconstruction forPeapproaching 5, corresponding to an order of magnitude increase in the maximum probe scan speed. This upper limit corresponds to the onset of chaotic convective flows within the electrolyte for the probes investigated in this work, highlighting the importance of considering hydrodynamics in the design of fast-scanning probes.