Quantifying electric field gradient fluctuations over polymers using ultrasensitive cantilevers.
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.
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
Showkat M
SM
Yazdanian
Nikolas
N
Hoepker
Seppe
S
Kuehn
Roger F
RF
Loring
John A
JA
Marohn