I-graphite esemgangathweni ophezulu inamandla oomatshini agqwesileyo, uzinzo lobushushu, ukuguquguquka okuphezulu kunye nokuqhuba okuphezulu kakhulu kobushushu kunye nombane ngaphakathi, okwenza ibe yenye yezona zinto zibalulekileyo ziphambili kwizicelo ezininzi ezifana nee-conductors ze-photothermal ezisetyenziswa njengeebhetri kwiifowuni. Umzekelo, uhlobo olukhethekileyo lwe-graphite, i-highly ordered pyrolytic graphite (HOPG), yenye yezona zisetyenziswa kakhulu kwiilebhu. Izinto. Ezi mpawu zibalaseleyo zibangelwa yisakhiwo se-graphite esineengqimba, apho iibhondi ezinamandla ze-covalent phakathi kwee-athomu zekhabhoni kwiingqimba ze-graphene zinegalelo kwiipropati ezintle zoomatshini, ukuqhuba kobushushu kunye nombane, ngelixa kuncinci kakhulu ukusebenzisana phakathi kweengqimba ze-graphene. Isenzo siphumela kwinqanaba eliphezulu lokuguquguquka. i-graphite. Nangona i-graphite ifunyenwe kwindalo kangangeminyaka engaphezu kwe-1000 kwaye ukwenziwa kwayo okwenziweyo kufundwe iminyaka engaphezu kwe-100, umgangatho weesampuli ze-graphite, zombini zendalo kunye nezokwenziwa, awulunganga kangako. Umzekelo, ubungakanani beendawo ezinkulu ze-graphite zekristale enye kwizixhobo ze-graphite zihlala zingaphantsi kwe-1 mm, nto leyo eyahluke kakhulu kubukhulu beekristale ezininzi ezifana neekristale ze-quartz enye kunye neekristale ze-silicon enye. Ubungakanani bunokufikelela kwisikali semitha. Ubukhulu obuncinci kakhulu be-single-crystal graphite bubangelwa kukunxibelelana okubuthathaka phakathi kweeleya ze-graphite, kwaye ukuba tyaba kweleya ye-graphene kunzima ukuyigcina ngexesha lokukhula, ngoko ke i-graphite yahlulwahlulwa ngokulula ibe yimida emininzi ye-single-crystal engalunganga. . Ukusombulula le ngxaki iphambili, uNjingalwazi Emeritus we-Ulsan National Institute of Science and Technology (UNIST) kunye nabasebenzi bakhe uNjingalwazi Liu Kaihui, uNjingalwazi Wang Enge weYunivesithi yasePeking, kunye nabanye bacebise icebo lokudibanisa ifilimu ye-graphite single crystals. thin order-of-magnitude, ukuya kwi-intshi. Indlela yabo isebenzisa i-single-crystal nickel foil njenge-substrate, kwaye ii-athomu ze-carbon zondliwa ngasemva kwe-nickel foil ngenkqubo "yokunyibilika-ukusasazwa-ukufakwa kwe-isothermal". Endaweni yokusebenzisa umthombo wekhadibhodi yegesi, bakhethe izinto ze-carbon eziqinileyo ukuze kube lula ukukhula kwe-graphite. Eli cebo litsha lenza kube nokwenzeka ukuvelisa iifilimu zegrafiti yekristale enye enobukhulu obumalunga ne-intshi enye kunye nee-microns ezingama-35, okanye ngaphezulu kwe-100,000 yee-graphene layers kwiintsuku ezimbalwa. Xa kuthelekiswa nazo zonke iisampuli zegrafiti ezikhoyo, igrafiti yekristale enye inomoya wokushisa we-~2880 W m-1K-1, umxholo ongaphantsi kokungcola, kunye nomgama omncinci phakathi kwee-layers. (1) Ukwenziwa ngempumelelo kweefilimu ze-nickel zekristale enye ezinobukhulu obukhulu njengee-substrates ezithe tyaba kakhulu kuthintela ukuphazamiseka kwegrafiti yokwenziwa; (2) Ii-layers ze-graphene eziyi-100,000 zikhuliswa ngokwahlukileyo kwiiyure ezili-100, ukuze umaleko ngamnye wegrafiti wenziwe kwindawo efanayo yeekhemikhali kunye nobushushu, okuqinisekisa umgangatho ofanayo wegrafiti; (3) Ukunikezelwa okuqhubekayo kwekhabhoni kwicala elingasemva le-nickel foil kuvumela ii-layers zegrafiti ukuba zikhule ngokuqhubekayo ngesantya esiphezulu kakhulu, malunga nomaleko omnye rhoqo ngemizuzwana emihlanu,”
Ixesha lokuthumela: Novemba-09-2022