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Title :Top-down approach using supercritical carbon dioxide ball milling for producing sub-10 nm Bi_2 Te_3 grains
Authors :Atwa, Mohamed
Nakagawa, Tessui
Yonamine, Akira
Lloyd, David C.
Schreiber, Makoto
Miyazaki, Koji
Takeuchi, Tsunehiro
Okada, Yoshinori
Issue Date :20-May-2020
Abstract :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.
URL :https://doi.org/10.35848/1882-0786/ab91d2
Type Local :雑誌掲載論文
ISSN :1882-0778
1882-0786
Publisher :Japan Society of Applied Physics
URI :http://hdl.handle.net/20.500.12000/47206
Citation :Applied Physics Express Vol.13 no.067002-1 p.067002-5
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Science)

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