Yazdanian Showkat M, Hoepker Nikolas, Kuehn Seppe, Loring Roger F, Marohn John A
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
Nano Lett. 2009 Jun;9(6):2273-9. doi: 10.1021/nl9004332.
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.
一个超灵敏悬臂在真空中平行于表面振荡，用于探测薄聚合物薄膜上微弱的热电场梯度波动。我们测量悬臂频率波动的功率谱，它是悬臂高度以及施加在各种成分和厚度聚合物上的电压的函数。这些数据可以很好地用线性响应理论来描述，该理论计算由热驱动的介电波动产生的随机电场。
