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Quantifying electric field gradient fluctuations over polymers using ultrasensitive cantilevers.

Showkat M Yazdanian¹, Nikolas Hoepker, Seppe Kuehn

¹Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.

|May 14, 2009

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This study uses ultrasensitive cantilevers to measure electric field fluctuations from thermal motion in polymer films. The findings support a theory explaining these fields via dielectric fluctuations.

Area of Science:

Physics
Materials Science
Surface Science

Background:

Understanding thermal fluctuations is crucial for nanoscale device performance.
Dielectric fluctuations in polymers can generate measurable electric fields.

Purpose of the Study:

To probe weak thermal electric field gradient fluctuations over thin polymer films.
To investigate the relationship between cantilever dynamics and polymer properties.

Main Methods:

Utilized an ultrasensitive cantilever oscillating in a vacuum.
Measured power spectrum of cantilever frequency fluctuations versus height and voltage.
Examined various polymer compositions and thicknesses.

Main Results:

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Successfully detected electric field gradient fluctuations.

Data correlated well with cantilever height and applied voltage.

Observed distinct responses based on polymer composition and thickness.

Conclusions:

Thermal dielectric fluctuations in polymers are a source of measurable electric fields.
Linear-response theory accurately models these stochastic electric fields.
Cantilever-based measurements offer a sensitive method for characterizing polymer dielectric properties.