Top-down approach using supercritical carbon dioxide ball milling for producing sub-10 nm Bi_2 Te_3 grains

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  • Top-down approach using supercritical carbon dioxide ball milling for producing sub-10 nm Bi<sub>2</sub>Te<sub>3</sub> grains

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We compare Bi_2Te_3 powders prepared by conventional ball milling to powders milled in supercritical carbon dioxide (scCO_2). We demonstrate that scCO_2 milling overcomes size-reduction limitations reported for conventional milling. XRD and TEM reveal nanograins with smaller average sizes (< 10 nm) and narrower grain size distributions in the scCO_2 milled case. scCO_2 milling also preserves the crystallinity and shows less oxidation than conventional milling. This is the first report of Bi_2Te_3 with a sub-10 nm grain size whilst conserving high quality crystallinity, made using a top-down approach. Our study offers a route for developing unprecedentedly fine bulk nanostructured Bi_2Te_3-based thermoelectric materials.

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Journal

  • Applied Physics Express

    Applied Physics Express 13 (067002-1), 067002-5-, 2020-05-20

    Japan Society of Applied Physics

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