{"id":3021,"date":"2023-02-22T11:37:07","date_gmt":"2023-02-22T02:37:07","guid":{"rendered":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/?p=3021"},"modified":"2023-02-22T11:37:10","modified_gmt":"2023-02-22T02:37:10","slug":"press-release-solid-state-thermal-transistors-realized","status":"publish","type":"post","link":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/press-release-solid-state-thermal-transistors-realized\/","title":{"rendered":"Press release: Solid-state thermal transistors realized"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"1024\" height=\"707\" src=\"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-content\/uploads\/sites\/2\/2023\/02\/Figure-1024x707.jpg\" alt=\"\" class=\"wp-image-3023\" srcset=\"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-content\/uploads\/sites\/2\/2023\/02\/Figure-1024x707.jpg 1024w, https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-content\/uploads\/sites\/2\/2023\/02\/Figure-300x207.jpg 300w, https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-content\/uploads\/sites\/2\/2023\/02\/Figure-1536x1061.jpg 1536w, https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-content\/uploads\/sites\/2\/2023\/02\/Figure-500x345.jpg 500w, https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-content\/uploads\/sites\/2\/2023\/02\/Figure.jpg 1902w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Thermal transistors that electrically control heat flow have attracted growing attention as thermal management devices and phonon logic circuits. Although several thermal transistors have been demonstrated, the use of liquid electrolytes may limit the application from the viewpoint of reliability or liquid leakage. Here, we demonstrate a solid-state thermal transistor that can electrochemically control the heat flow with an on-to-off ratio of the thermal conductivity (<em>\u03ba<\/em>) of ~4 without using any liquid. The thermal transistor is a multilayer film composed of an upper electrode, strontium cobaltite (SrCoO<em><sub>x<\/sub><\/em>), solid electrolyte, and bottom electrode. An electrochemical redox treatment at 280 \u00b0C in air repeatedly modulates the crystal structure and <em>\u03ba <\/em>of the SrCoO<em><sub>x<\/sub><\/em> layer. The fully oxidized perovskite-structured SrCoO<sub>3<\/sub> layer shows a high <em>\u03ba<\/em> ~3.8 W m<sup>\u22121<\/sup> K<sup>\u22121<\/sup>, whereas the fully reduced defect perovskite-structured SrCoO<sub>2<\/sub> layer shows a low <em>\u03ba<\/em> ~0.95 W m<sup>\u22121<\/sup> K<sup>\u22121<\/sup>. The present solid-state electrochemical thermal transistor may become next-generation devices toward future thermal management technology.<\/p>\n\n\n\n<p>Press released from Hokkaido University on February 22nd, 2023.<\/p>\n\n\n\n<p>(in English) <a href=\"https:\/\/www.global.hokudai.ac.jp\/blog\/solid-state-thermal-transistor-demonstrated\/\" target=\"_blank\" rel=\"noreferrer noopener\" title=\"https:\/\/www.global.hokudai.ac.jp\/blog\/solid-state-thermal-transistor-demonstrated\/\">https:\/\/www.global.hokudai.ac.jp\/blog\/solid-state-thermal-transistor-demonstrated\/<\/a><\/p>\n\n\n\n<figure class=\"wp-block-embed-wordpress wp-block-embed is-type-wp-embed is-provider-hokkaido-university\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"0Yw19IjPJ1\"><a href=\"https:\/\/www.global.hokudai.ac.jp\/blog\/solid-state-thermal-transistor-demonstrated\/\">Solid-state thermal transistor demonstrated<\/a><\/blockquote><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;Solid-state thermal transistor demonstrated&#8221; &#8212; Hokkaido University\" src=\"https:\/\/www.global.hokudai.ac.jp\/blog\/solid-state-thermal-transistor-demonstrated\/embed\/#?secret=umISr4H09y#?secret=0Yw19IjPJ1\" data-secret=\"0Yw19IjPJ1\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Qian Yang, Hai Jun Cho, Zhiping Bian, Mitsuki Yoshimura, Joonhyuk Lee, Hyoungjeen Jeen, Jinghuang Lin, Jiake Wei, Bin Feng, Yuichi Ikuhara, and Hiromichi Ohta*, \u201cSolid-State Electrochemical Thermal Transistors\u201d, <strong><em>Advanced Functional Materials<\/em><\/strong> (February 21, 2023) (DOI: 10.1002\/adfm.202214939)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thermal transistors that electrically control heat flow have attracted growing attention as thermal management&#8230;..<\/p>\n","protected":false},"author":1,"featured_media":3024,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/posts\/3021"}],"collection":[{"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/comments?post=3021"}],"version-history":[{"count":4,"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/posts\/3021\/revisions"}],"predecessor-version":[{"id":3030,"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/posts\/3021\/revisions\/3030"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/media\/3024"}],"wp:attachment":[{"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/media?parent=3021"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/categories?post=3021"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/functfilm.es.hokudai.ac.jp\/english\/wp-json\/wp\/v2\/tags?post=3021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}