University of Twente Student Theses
Characterizing the Anisotropic Electrical Properties of 3D Printed Conductive Sheets
Dijkshoorn, A.P. (2019) Characterizing the Anisotropic Electrical Properties of 3D Printed Conductive Sheets.
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| Abstract: | This study introduces a model and characterization techniques to investigate anisotropic, electrical properties of conductive 3D-printed sheets, where anisotropy is induced by 3D-printing. A model is presented that predicts the electrical properties of 3D-printed conductors based on the combination of electrical bulk and interface properties in and between the printed traxels (track elements). The model shows the importance of the relative interface impedance for the conduction mode through samples. An RC-model describes the bulk properties of the conductive polymer composite with quantum-tunneling. Dielectric impedance spectroscopy is used to measure the total impedance, on which the bulk material and electrical interface parameters can be fitted. High permittivity values are determined from measurements with the RC-model, which are likely too high because of incomplete knowledge of the structure on the nano-level. Samples are fabricated with FDM, giving rise to the electrical interfaces. The nature of these electrical interfaces is still unclear. The use of the SEM voltage contrast method is presented to determine the potential distributions of 3D-printed sheets. Through pixel-wise calibration and curve fitting a reliable qualitative voltage distribution can be obtained. IR thermography is implemented to characterize the power dissipation in samples. A frequency analysis of the temperature of the harmonically heated sample, called lock-in thermography, can be used to improve the measurements. High frequency measurement methods for VCSEM and IR thermography are proposed. The developed modelling and measurement methods show good consistency of the qualitative results when applied to the same sample and can therefore be used alongside each other. Quantitative measurements are shown as well, however they still require improvements of the developed methods. All in all the model and characterization methods show promising results, enabling improvement of 3D-printed transducer designs, and exploit electrical properties of 3D-printed conductors. |
| Item Type: | Essay (Master) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 50 technical science in general |
| Programme: | Electrical Engineering MSc (60353) |
| Link to this item: | https://purl.utwente.nl/essays/78084 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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