AI Article Synopsis
- This research introduces a new scanning thermal microscopy (SThM) method using thermoelectric junctions in an ac active mode, offering a novel approach compared to the traditional 3omega operating mode.
- The technique measures thermophysical properties at micro- and nanoscale by generating thermal oscillations through Joule heating, and allows for accurate thermoelectric voltage measurements using a differential bridge and lock-in amplifier.
- Results include the extraction of thermal contact conductance values for various materials, demonstrating the effectiveness of the new method in comparison to the resistive 3omega approach.
Article Abstract
We present a contribution to a new mode of scanning thermal microscopy (SThM) based on the use of thermoelectric junction operating in ac active mode. This is the first alternative to 3omega operating mode of a resistive SThM probe for measuring thermophysical parameters of materials at micro- and nanoscale. Whereas a current at omega frequency generates by Joule effect a 2omega thermal oscillation along the wires, the junction thermoelectric voltage can be measured by means of a differential bridge scheme associated to a lock-in amplifier. A thermal model is presented that confirms measurements performed in different situations with different wire probes. Values of thermal contact conductance of different materials have been extracted and a comparison has been performed between this technique and the resistive 3omega mode.
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| http://dx.doi.org/10.1063/1.3097183 | DOI Listing |
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