Quantifying electric field gradient fluctuations over polymers using ultrasensitive cantilevers.
basic_science · Level V
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- Record sourced from PubMed, PMID 19435337.
- Also identified by DOI 10.1021/nl9004332 and PMC identifier 2838734.
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Abstract
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.