Broadband nanodielectric spectroscopy by means of amplitude modulation electrostatic force microscopy (AM-EFM).
نویسندگان
چکیده
In this work we present a new AFM based approach to measure the local dielectric response of polymer films at the nanoscale by means of Amplitude Modulation Electrostatic Force Microscopy (AM-EFM). The proposed experimental method is based on the measurement of the tip-sample force via the detection of the second harmonic component of the photosensor signal by means of a lock-in amplifier. This approach allows reaching unprecedented broad frequency range (2-3 × 10(4)Hz) without restrictions on the sample environment. The method was tested on different poly(vinyl acetate) (PVAc) films at several temperatures. Simple analytical models for describing the electric tip-sample interaction semi-quantitatively account for the dependence of the measured local dielectric response on samples with different thicknesses and at several tip-sample distances.
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Open Archive Toulouse Archive Ouverte (oatao) Broadband Nanodielectric Spectroscopy by Means of Amplitude Modulation Electrostatic Force Microscopy (am-efm)
In this work we present a new AFM based approach to measure the local dielectric response of polymer films at the nanoscale by means of Amplitude Modulation Electrostatic Force Microscopy (AM-EFM). The proposed experimental method is based on the measurement of the tip–sample force via the detection of the second harmonic component of the photosensor signal by means of a lock-in amplifier. This...
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عنوان ژورنال:
- Ultramicroscopy
دوره 111 8 شماره
صفحات -
تاریخ انتشار 2011