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单分子光流通道的轨道分辨率可视化

Miyabi Imai-Imada¹, Hiroshi Imada^2,3, Kuniyuki Miwa^1,4

¹Surface and Interface Science Laboratory, RIKEN, Wako, Japan.

|March 31, 2022

概括

研究人员使用扫描道显微镜可视化单个分子中的光电流. 他们精确控制了光诱导电子转移 (PET) 和光发光,为通过原子级工程增强能量转换铺平了道路.

科学领域:

分子生物物理学
纳米技术
物理化学

背景情况:

光诱导电子转移 (PET) 对光能利用至关重要,但缺乏分子层面的空间分辨率.
微观光流测量与局部特征相关,但在空间上是有限的.
扫描道显微镜 (STM) 与等离子场相结合,可以进行单分子激发和探测.

研究的目的:

在单个分子中的分子轨道水平上可视化光流通道.
研究偏差电压对光电流方向和分布的影响.
探讨PET和光发光之间的竞争以及控制它们的方法.

主要方法:

使用可调节激光驱动的局部等离子场.
激发和探测单个自由基酸 (FBPc) 分子.
通过STM尖端道检测第一个兴奋状态的电子.

主要成果:

通过原子分辨率的分子轨道直接可视化光流通道.
偏差电压依赖的光电流方向和空间分布的识别.
即使接近零平均电压,也可以观察反流光电流.
有证据表明PET与光发光具有竞争力.
通过STM尖端定位来证明对PET的控制与光发放松.

结论:

光流通道对偏向电压和分子轨道合敏感.
可实现对PET和光发光的原子尺度控制.
通过原子级接口工程提议改进能源转换效率的新策略.

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