AI 中文总结
该研究开发了电位调制光离子电子iSCAT方法，可宽场成像纳米结构电极的双电层动力学，实现异质电化学界面局部充电与电连接性的无标记光学映射。
AI 中文摘要
电连接性和界面离子积累的空间变化会强烈影响电化学性能，但传统的整体测量方法难以直接可视化这些特性。本文介绍了电位调制光离子电子显微镜，这是一种用于宽场成像纳米结构电极处双电层（EDL）动力学的干涉散射显微镜（iSCAT）方法。对聚焦离子束制备的氧化铟锡（ITO）纳米孔施加正弦电位，通过傅里叶解调提取调制频率下的光学响应。在低电压滚降以上，光学调制幅度随调制电压近似线性增加，随频率升高而降低，这与动力学受限的界面充电一致。随后，我们对图案化ITO电极上的电位同步光学幅度进行成像，电隔离块体表现出强烈抑制的调制信号，而电连接和部分铣削的纳米网格结构则显示出显著响应。这些结果表明，利用商用iSCAT平台可实现异质电化学界面处局部充电动力学和电连接性的无标记光学成像。
英文摘要
Spatial variations in electrical connectivity and interfacial ion accumulation can strongly influence electrochemical performance, yet these properties are difficult to visualize directly with conventional ensemble measurements. Here, we introduce potential-modulated opto-iontronic microscopy, an interferometric scattering microscopy (iSCAT) approach for wide-field imaging of electric-double-layer (EDL) dynamics at nanostructured electrodes. Sinusoidal potentials were applied to focused-ion-beam-fabricated indium tin oxide (ITO) nanoholes, and the optical response was extracted at the modulation frequency by Fourier demodulation. The optical modulation amplitude increased approximately linearly with modulation voltage above a low-voltage roll-off and decreased with increasing frequency, consistent with kinetically limited interfacial charging. We then mapped the potential-synchronized optical amplitude across patterned ITO electrodes. Electrically isolated blocks exhibited strongly suppressed modulation signals, whereas electrically connected and partially milled nanogrid structures showed pronounced responses. These results demonstrate label-free optical mapping of local charging dynamics and electrical connectivity at heterogeneous electrochemical interfaces using a commercially available iSCAT platform.
