Visualization of Charge Migration in Conductive Polymers via Time-Resolved Electrostatic Force Microscopy.,The Journal of Physical Chemistry A

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Visualization of Charge Migration in Conductive Polymers via Time-Resolved Electrostatic Force Microscopy.
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2020-05-22 , DOI: 10.1021/acs.jpca.9b12017
Kentaro Kajimoto ₁ , Kento Araki ₁ , Yuki Usami ₁ , Hiroshi Ohoyama ₁ , Takuya Matsumoto ₁

Affiliation

Charge dynamics play an important role in numerous natural phenomena and artificial devices, and tracking charge migration and recombination is crucial for understanding the mechanism and function of systems involving charge transfer. Tip-synchronized pump–probe electrostatic force microscopy simultaneously permits highly sensitive detection, microsecond time resolution, and nanoscale spatial resolution, where the spatial distribution in static measurement (usual EFM) reflects differences in the carrier density and the time evolution reveals the surface carrier mobility. By using this method, carrier injection and ejection in sulfonated polyaniline (SPAN) thin films were visualized. Comparison of tr-EFM results of SPAN thin films with different doping levels revealed the individual differences in carrier density and mobility.

中文翻译：

通过时间分辨静电力显微镜观察导电聚合物中的电荷迁移。

电荷动力学在众多自然现象和人工装置中起着重要作用，而跟踪电荷迁移和重组对于理解涉及电荷转移的系统的机制和功能至关重要。尖端同步泵浦探针静电力显微镜可同时实现高灵敏度的检测，微秒级的时间分辨率和纳米级的空间分辨率，其中静态测量（通常为EFM）中的空间分布反映了载流子密度的差异，时间演变揭示了表面载流子的迁移性。通过使用此方法，可以看到磺化聚苯胺（SPAN）薄膜中的载流子注入和注入。比较具有不同掺杂水平的SPAN薄膜的tr-EFM结果，发现载流子密度和迁移率存在个体差异。

更新日期：2020-06-25

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