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Scanning Electrochemical Microscopy Featuring Transient Current Signals in Carbon Nanopipets with Dilute or No Redox Mediator
Analytical Chemistry ( IF 7.4 ) Pub Date : 2022-08-03 , DOI: 10.1021/acs.analchem.2c02596
Yingfei Ma 1 , Yingjie Zhao 1 , Rujia Liu 1 , Dengchao Wang 1
Affiliation  

Herein, we report a sensitive scanning electrochemical microscopy (SECM) method based on the high transient current signals in carbon nanopipets (CNPs) under step potential waveforms. Taking advantage of the transient peak current, the approach curve can be conducted with very dilute (1 μM) or even no redox mediator and fitted by the scanning ion conductance microscopy (SICM) theory. In addition, a trace amount of electroactive species generated at the substrate can also be directly revealed from the transient current at the CNP tips. With the established feedback and generation/collection methods, we present the constant-height topography and electroactivity imaging of the substrates with only 1 μM K4Fe(CN)6. The developed new SECM method would allow the usage of CNPs to achieve both high sensitivity and spatial resolution with dilute or no redox mediator and thus find great potential applications in biological and electrocatalytic studies.

中文翻译:

具有稀有或无氧化还原介质的碳纳米移液管中具有瞬态电流信号的扫描电化学显微镜

在此,我们报告了一种灵敏的扫描电化学显微镜 (SECM) 方法,该方法基于阶跃电位波形下碳纳米管 (CNP) 中的高瞬态电流信号。利用瞬态峰值电流,可以在非常稀(1 μM)甚至没有氧化还原介质的情况下进行逼近曲线,并通过扫描离子电导显微镜(SICM)理论进行拟合。此外,基板上产生的微量电活性物质也可以直接从 CNP 尖端的瞬态电流中揭示出来。通过建立的反馈和生成/收集方法,我们展示了仅使用 1 μM K 4 Fe(CN) 6的基板的恒定高度形貌和电活性成像. 开发的新 SECM 方法将允许使用 CNP 在稀释或没有氧化还原介质的情况下实现高灵敏度和空间分辨率,从而在生物和电催化研究中发现巨大的潜在应用。
更新日期:2022-08-03
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