I would like to measure the conductivity of some pristine dry materials.
I understand that conductivity of materials can be measured by a 2-/4-probe method or through electrochemical impedance spectroscopy (EIS), however, these require the materials to be made into a pellet and not fall apart, or be synthesised as a monolith, etc. If my material is a powder that when pressed falls apart, what other methods could I try to get electrical conductivity data? I assume adding a binder will affect the result. I will drop cast and measure EIS as a cell if I cannot do so with the dry material.
Thanks.
Dear Sir. Concerning your issue about the measurement of the conductivity of amorphous carbon such as some pristine dry materials. Amorphous carbon (a-C) thin films have been prepared by r.f. magnetron sputtering of graphite targets in an Ar atmosphere and their d.c. electrical dark conductivity has been measured as a function of temperature. The results are compared with those obtained by earlier workers for a-C and hydrogenated a-C. A detailed analysis leads us to the conclusion that conductivity of amorphous C with or without H is determined mostly by the amount and distribution of sp2 sites in the material. Near room temperature the experimental results suggest hopping between neighbouring sp2 (graphitic) islands embedded in an sp3 (diamond-like) matrix if the sp2:sp3 ratio is below its percolation threshold value and hopping in the band tails if this ratio is above such a threshold. In the temperature region above 500 K hopping in the band tails is shown to be the only effective mechanism. I think the following below links may help you in your analysis:
https://arxiv.org/pdf/cond-mat/0008084.pdf
http://www.tandfonline.com/doi/abs/10.1080/13642819108205558
https://www.nature.com/articles/s41598-017-12605-y.pdf?origin=ppub
Thanks
Hello Jet-Sing M. Lee,
By AFM you can measure both conductivity and capacitance. For example:
https://www.azonano.com/article.aspx?ArticleID=3970
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