Direct Observation of Redox-Induced Bubble Generation and Nanopore Formation Dynamics in Controlled Dielectric Breakdown
Direct Observation of Redox-Induced Bubble Generation and Nanopore Formation Dynamics in Controlled Dielectric Breakdown
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DOI：
10.1021/acsaelm.0c00576
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发表时间：
2020-09-22
影响因子：
4.7
通讯作者：
Guan, Weihua
中科院分区：
文献类型：
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作者：
Dong, Ming;Tang, Zifan;Guan, Weihua
尽管可控介电击穿(CBD)是一种很有前途的固态纳米孔制备方法，但由于缺乏当前监测之外的原位交叉参考表征，在理解制备动力学方面仍存在重大挑战。在这项工作中，我们开发了一种多峰方法来表征基于介电击穿的纳米孔形成动力学。利用这一能力，我们首次观察到了氧化还原诱导的电解液-膜界面气泡的产生。随机产生的气泡将显著改变膜表面的电场分布，是导致纳米孔随机分布的一个被忽视的因素。此外，我们还研究了电场强度对初始形成和扩大后的纳米孔(S)数量和位置的影响。我们相信，本工作提供的氧化还原诱导气泡形成的直接证据以及电场对纳米孔形成动力学的影响将为进一步改进基于击穿的固态纳米孔的制备提供重要的实验依据。
While controlled dielectric breakdown (CBD) emerged as a promising method for accessible solid-state nanopore fabrication, there are still significant challenges in understanding the fabrication dynamics due to the lack of in situ cross-reference characterization beyond current monitoring. In this work, we developed a multimodal method for characterizing the dielectric breakdown-based nanopore formation dynamics. With this capability, we observed for the first time the redox-induced bubble generation at the electrolyte-membrane interface. The randomly generated gas bubble would significantly alter the electric field distribution on the membrane surfaces and is an overlooked factor that can contribute to the random distribution of the nanopores. Besides, we also studied the impact of electric field strength on the number and location of nanopore(s) initially formed and after enlargement. We believe that the direct evidence of redox-induced bubble formation and the impact of the electric field on nanopore formation dynamics presented in this work would provide significant experimental insight for further improving the breakdown-based solid-state nanopore fabrication.