Conduction measurements of 3D printed conductive composites
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2021Access restrictions
The author has not given permission to make the work publicly available electronically. Therefore the material can be read only at the archival workstation at Jyväskylä University Library (https://kirjasto.jyu.fi/collections/archival-workstation).
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SLS 3D tulostettujen komposiittien sähkönjohto-ominaisuuksia ja reagointia paineeseen tutkittiin. Komposiitit tehtiin polystyreenistä tai nailonista, joihin sekoitettiin grafiitti-, super-P-, tai hiilinanoputkijauhetta. Paras johtavuus (4.3 S/m) saavutettiin polystyreenillä (60 %) ja grafiitilla (40 %). 3D tulosteet muuttuivat hauraiksi hyvin nopeasti, kun niihin lisättiin super-P tai hiilinanoputkijauhetta. Sähkönjohtavuuden reagointia paineeseen havaittiin ja vaikuttaa siltä, että materiaalia voisi käyttää painesensorina. Onnistuneet mittaukset saatiin tehtyä, kun materiaali oli perkolaatiokynnyksen yläpuolella. Perkolaationkynnyksen alapuolella tapahtuvaa käyttäytymistä ei saatu näkyviin, kun lämpötilaa muutettiin huoneenlämmön ja nestetypen lämpötilan välillä, mutta kun grafiittia oli 10 % komposiitin painosta niin se muodosti jatkuvia johtavia polkuja partikkelista toiseen, joita pitkin elektronit pääsivät johtumaan. Materiaalia olisi mahdollista käyttää virtausakkujen elektrodeina, mutta se ei vielä kykene kilpailemaan kaupallisten vaihtoehtojen kanssa.
...
The electrical properties and their pressure sensitivity of SLS 3D printed composites were studied. These composites were composed of polystyrene or nylon mixed with graphite, super-P, or carbon nanotube powder. The best conductivity of 4.3 S/m was achieved with polystyrene (60 %) and graphite (40 %). The 3D prints became brittle very quickly when super-P or carbon nanotubes were used. Pressure sensitivity was observed, and it seems that the sensitivity is adequate for the material to be used as a pressure sensor. Successful measurements were done for materials above the percolation limit and at the temperature of liquid nitrogen and room temperature. The composite with a graphite concentration of 10 %, had continuous conducting pathways from particle to particle. Tunneling and hopping were not observed. The material could be used as a flow battery electrode, but it cannot yet compete with commercial options.


Keywords
super-P carbon nanotubes selective laser sintering 3D-tulostus grafiitti sähkönjohtavuus nanoputket sähköiset ominaisuudet polystyreeni komposiitit jauheet nanorakenteet nailon 3D printing graphite electric conductivity nanotubes electric properties polystyrene composites powders nanostructures nylon
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