Simultaneous Separation Measurement of Principal Electrical Conductivities and Principal Axis Angle of Two-Dimensional Anisotropic Material Using Multi-Probe Measuring Method

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"We measured the principal electrical conductivities and the principal axis angle of a Pylolytic Graphite Sheet (PGS,Panasonic Corp.) has a thickness of 100–μm and a 12–μm-thick aluminum foil by the multi-probe conductivity measurementmethod. To determine its principal electrical conductivities, a sample is electrified using a point power supply touches at thesample surface and each of three electrified probes contact with three axes which center a point power supply on the samplesurface and the transient voltage changes of three directions with β=120° are measured by this method. The average of thecalculated two principal electrical conductivities of PGS are σp1=4.91×103 S/cm and σp2=4.02×103 S/cm. The geometrical meanof the two measured principal thermal conductivities of PGS is σ=(σp1・σp2)1/2=4.45×103 S/cm. The anisotropic factor ξ, whichis the ratio of σp1 to σp2, is 1.23. And the average of calculated σp1 and σp2 values of isotropic Al film are σp1=3.84×105 S/cm andσp2=3.69×105 S/cm. The geometrical mean of the two measured principal electrical conductivities of the Al film is σ=(σp1・σp2)1/2=3.76×105 S/cm. And the average of anisotropic factor of the aluminum film is ξ=1.04. So this method can measure anddetermine the electrical anisotropic factor. And there is a possibility for PGS to become a standard two-dimensional anisotropicmaterial."
2011-03-01