A continuous and reversible mechano-regulated surface potential using a stretchable plasmonic electrode

Manipulating the surface potential of electrode materials is a critical issue for improving the devices performance in the fields of nanophotonics, semiconductor/organic electronics, optoelectronics, and electrochemistry. Here, we demonstrate a novel mechano-plasmonic modulation of surface potential by tailoring the plasmon off-resonance of stretchable plasmonic electrode. The surface potential of the stretchable plasmonic electrode can be continuously and reversibly modulated in the range of 80 mV with high stability and reproducibility. The proposed plasmon off-resonance assisted electron flow model (POAEF model) well explored the energy conversion of the plasmon off-resonance excitation into electrochemical potential of plasmonic nanostructures. Significantly, the programmable modulations of electrochemical reactions based on the stretchable plasmonic electrode demonstrate that plasmon off-resonance excitation can be utilized to modulate the surface potential and the electrochemical activity of noble-metal nanostructures.

调控电极材料的表面电势，是提升纳米光子学、半导体/有机电子学、光电子学及电化学领域器件性能的核心课题。本文通过调控可拉伸等离激元（plasmon）电极的等离激元失谐特性，实现了一种全新的表面电势机械等离激元调控方案。该可拉伸等离激元电极的表面电势可在80 mV范围内实现连续可逆调控，且具备优异的稳定性与重现性。本文提出的等离激元失谐辅助电子流动模型（POAEF模型），系统阐明了等离激元失谐激发向等离激元纳米结构电化学电势的能量转化机制。尤为关键的是，基于该可拉伸等离激元电极的电化学可编程调控实验证实，等离激元失谐激发可用于调控贵金属纳米结构的表面电势与电化学活性。