电场作用下自组装单层压电材料的构象变化
Self-Assembled Monolayer Piezoelectrics: Electric-Field Driven Conformational Changes
摘要：
我们证明了施加的电场会引起寡肽单分子单层的压电畸变。我们在光滑的金表面上沉积了约1.5 nm高的自组装单分子膜。这些单分子膜表现出很强的压电响应，随外加偏压（1-3V）线性变化，使用压电响应力显微镜（PFM）测量。的响应是显着大于控制实验与刚性烷硫醇和相关的表面光谱和理论预测的构象变化，从应用电场。与现有的压电氧化物不同，我们的肽单层具有固有的柔性，易于制造，对齐和图案化而无需极化。
英文摘要：
We demonstrate that an applied electric field causes piezoelectric distortion across single molecular monolayers of oligopeptides. We deposited self-assembled monolayers ~1.5 nm high onto smooth gold surfaces. These monolayers exhibit strong piezoelectric response that varies linearly with applied bias (1-3V), measured using piezoresponse force microscopy (PFM). The response is markedly greater than control experiments with rigid alkanethiols and correlates with surface spectroscopy and theoretical predictions of conformational change from applied electric fields. Unlike existing piezoelectric oxides, our peptide monolayers are intrinsically flexible, easily fabricated, aligned and patterned without poling.
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