Quantifying electric field gradient fluctuations over polymers using ultrasensitive cantilevers.
Quantifying electric field gradient fluctuations over polymers using ultrasensitive cantilevers.
复制标题
使用超灵敏悬臂梁量化聚合物上的电场梯度波动。
DOI：
10.1021/nl9004332
复制
发表时间：
2009
期刊：
影响因子：
10.8
通讯作者：
Marohn,JohnA
中科院分区：
文献类型：
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作者：
Yazdanian,ShowkatM;Hoepker,Nikolas;Kuehn,Seppe;Loring,RogerF;Marohn,JohnA
利用超灵敏悬臂梁在真空中平行于表面振荡，探测聚合物薄膜上的弱热电场梯度起伏。我们测量的功率谱的悬臂梁频率波动的悬臂梁的高度和电压的各种组合物和厚度的聚合物的函数。数据很好地描述了由线性响应理论，计算随机电场所产生的热驱动的介电波动。
An ultrasensitive cantilever, oscillating parallel to a surface in vacuum, is used to probe weak thermal electric field gradient fluctuations over thin polymer films. We measure the power spectrum of cantilever frequency fluctuations as a function of cantilever height and voltage over polymers of various compositions and thicknesses. The data are well described by a linear-response theory that calculates stochastic electric fields arising from thermally driven dielectric fluctuations.