Freestanding Flexible Sensor Based on 3ω Technique for Anisotropic Thermal Conductivity Measurement of Potassium Dihydrogen Phosphate Crystal

A new freestanding sensor-based 3 omega technique is presented here, which remarkably expands the application of traditional 3 omega technology to anisotropic materials. The freestanding flexible sensor was fabricated using the mature flexible printed circuit production technique, which is non-destructive to the samples and applicable to porous surfaces. The thermal conductivities of potassium dihydrogen phosphate (KDP) crystal along the (100), (010) and (001) crystallographic planes were measured based on this new sensor at room temperature. We found that the freestanding flexible sensor has considerable application value for thermal properties' characterization for crystals with anisotropic thermophysical properties and other structures for which the traditional 3 omega technique is not applicable.

Automated summary

A new freestanding sensor-based 3 omega technique has been developed, expanding the traditional 3 omega technology to anisotropic materials. The flexible sensor, fabricated using mature flexible printed circuit production techniques, is non-destructive and suitable for porous surfaces. This new sensor has considerable application value for characterizing thermal properties of crystals with anisotropic thermophysical properties and other structures where traditional 3 omega technique is not applicable.