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Electrochemically Imaging the Response of Ion-Selective Membranes with an Ultralow Detection Limit
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-03-17 , DOI: 10.1021/acsami.2c01839 Yu Li 1 , Rong Jin 1 , Lingfang Xu 2 , Depeng Jiang 2 , Hong-Yuan Chen 1 , Dechen Jiang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-03-17 , DOI: 10.1021/acsami.2c01839 Yu Li 1 , Rong Jin 1 , Lingfang Xu 2 , Depeng Jiang 2 , Hong-Yuan Chen 1 , Dechen Jiang 1
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The development of ion-selective membranes for the selective response of a particular ion has been studied for many years; however, imaging the response of the membrane with a low detection limit is challenging. Here, high spatial-resolution electrochemical imaging of this response down to picomolar is achieved using scanning ion conductive microscopy. The detection strategy relies on the exclusion of a small amount of counter ions from the membrane in the presence of a low concentration of target ions in the solution. These excluded counter ions are adsorbed at the membrane–solution interface, leading to more positive charges at the surface. The resultant elevation of the ionic current in the approach curve behaves as the response for the target ions down to 10–11 M, which is much more sensitive than that using potentiometric measurement. The constant-current scanning of the membrane exhibits the fluctuation of the apparent surface height that is correlated with the ionic concentration, permitting the imaging of the response at the nanoscale. The achievement of highly sensitive and spatial-resolution imaging for the ionic response enable the collection of spatial response at the ion-selective membrane, which will greatly advance the study of ion-selective electrodes.
中文翻译：
电化学成像具有超低检测限的离子选择性膜的响应
用于特定离子选择性响应的离子选择性膜的开发已经研究了多年。然而，以低检测限对膜的响应进行成像具有挑战性。在这里，使用扫描离子导电显微镜实现了这种低至皮摩尔响应的高空间分辨率电化学成像。检测策略依赖于在溶液中存在低浓度目标离子的情况下从膜中排除少量反离子。这些被排除在外的反离子被吸附在膜-溶液界面上，从而在表面产生更多的正电荷。接近曲线中离子电流的最终升高表现为目标离子的响应降低到 10 –11M，比使用电位测量法灵敏得多。膜的恒流扫描表现出与离子浓度相关的表观表面高度的波动，允许在纳米尺度上对响应进行成像。离子响应的高灵敏度和空间分辨率成像的实现使离子选择性膜上的空间响应的收集成为可能，这将极大地推动离子选择性电极的研究。
更新日期：2022-03-17
中文翻译：
电化学成像具有超低检测限的离子选择性膜的响应
用于特定离子选择性响应的离子选择性膜的开发已经研究了多年。然而，以低检测限对膜的响应进行成像具有挑战性。在这里，使用扫描离子导电显微镜实现了这种低至皮摩尔响应的高空间分辨率电化学成像。检测策略依赖于在溶液中存在低浓度目标离子的情况下从膜中排除少量反离子。这些被排除在外的反离子被吸附在膜-溶液界面上，从而在表面产生更多的正电荷。接近曲线中离子电流的最终升高表现为目标离子的响应降低到 10 –11M，比使用电位测量法灵敏得多。膜的恒流扫描表现出与离子浓度相关的表观表面高度的波动，允许在纳米尺度上对响应进行成像。离子响应的高灵敏度和空间分辨率成像的实现使离子选择性膜上的空间响应的收集成为可能，这将极大地推动离子选择性电极的研究。
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