Umgangatho ophezulu wegraphite unamandla agqwesileyo omatshini, ukuzinza kwe-thermal, ukuguquguquka okuphezulu kunye nomgangatho ophezulu kakhulu we-thermal kunye ne-conductivity yombane kwinqwelomoya, okwenza ibe yenye yezona zinto zibalulekileyo eziphambili kwizicelo ezininzi ezifana nee-conductor ze-photothermal ezisetyenziswa njengeebhetri kwiifowuni. Ngokomzekelo, uhlobo olukhethekileyo lwegraphite, i-pyrolytic graphite eyalelwe kakhulu (HOPG), yenye yezona zinto zisetyenziswa ngokuqhelekileyo kwiibhubhoratri. Izinto eziphathekayo. Ezi zakhiwo zibalaseleyo zibangelwa kulwakhiwo lwegrafu, apho iibhondi eziqinileyo eziqinileyo phakathi kweeathom zekhabhoni ezikwiimaleko zegraphene zinegalelo kubuchwephesha obugqwesileyo bomatshini, ukuhanjiswa kwe-thermal kunye nombane, ngelixa intsebenziswano encinci kakhulu phakathi kweeleya zegraphene. Isenzo siphumela kwinqanaba eliphezulu lokuguquguquka. igraphite. Nangona igraphite iye yafunyanwa kwindalo ngaphezu kweminyaka eyi-1000 kunye nokwenziwa kwayo okwenziweyo kufundwe iminyaka engaphezu kwe-100, umgangatho weesampulu zegraphite, zombini zendalo kunye nezokwenziwa, azikho kakuhle. Umzekelo, ubungakanani beyona ndawo inkulu yecrystal graphite domains kwimathiriyeli yegraphite iqhele ukuba ngaphantsi kwe-1 mm, ehluke kakhulu kubungakanani beekristale ezininzi ezifana neekristale zequartz enye kunye nesilicon enye crystals. Ubungakanani bunokufikelela kwisikali semitha. Ubungakanani obuncinci kakhulu be-crystal-crystal graphite kungenxa yentsebenziswano ebuthathaka phakathi kweengqimba zegraphite, kwaye i-flatness ye-graphene layer inzima ukuyigcina ngexesha lokukhula, ngoko ke i-graphite iqhekezwa ngokulula ibe yimida emininzi ye-crystal eyodwa kwi-disorder. . Ukucombulula le ngxaki iphambili, uNjingalwazi Emeritus we-Ulsan National Institute of Science and Technology (UNIST) kunye nabalingane bakhe uProf Liu Kaihui, uProf. Wang Enge weYunivesithi yasePeking, kunye nabanye baye bacebisa isicwangciso sobuchule bokwenza ulungelelwaniso oluncinci lwe-magnitude. iikristale zegraphite enye. ifilimu, ezantsi kwisikali se-intshi. Indlela yabo isebenzisa i-foil ye-nickel ye-crystal eyodwa njenge-substrate, kwaye ii-athomu zekhabhoni zondliwa ukusuka ngasemva kwe-nickel foil ngokusebenzisa "i-isothermal dissolution-diffusion-deposition process". Esikhundleni sokusebenzisa umthombo wekhadibhodi yegesi, bakhetha izinto eziqinileyo zekhabhoni ukuququzelela ukukhula kwegraphite. Esi sicwangciso esitsha senza ukuba kube lula ukuvelisa iifilimu ze-crystal ze-graphite ezinobunzima malunga ne-intshi eyi-1 kunye ne-35 microns, okanye ngaphezu kwe-100,000 ye-graphene layers ngeentsuku ezimbalwa. Xa kuthelekiswa nazo zonke iisampuli zegraphite ezikhoyo, i-crystal-crystal graphite ine-conductivity ye-thermal ~ 2880 W m-1K-1, umxholo ongabalulekanga wokungcola, kunye nomgama omncinci phakathi kweengqimba. (1) Ukwenziwa ngempumelelo kweefilimu zenickel enye yobungakanani obukhulu njengoko i-ultra-flat substrates ithintela ukuphazamiseka kwegraphite yokwenziwa; (2) I-100,000 yemigangatho yegraphene ikhuliswa isothermally malunga neeyure ze-100, ukuze umaleko ngamnye wegraphene wenziwe kwindawo efanayo yeekhemikhali kunye nobushushu, oqinisekisa umgangatho ofanayo wegraphite; (3) Ukubonelela ngokuqhubekayo kwekhabhoni kwicala elingasemva le-nickel foil ivumela iileya zegraphene ukuba zikhule ngokuqhubekayo ngesantya esiphezulu kakhulu, malunga nomaleko omnye rhoqo kwimizuzwana emihlanu.
Ixesha lokuposa: Nov-09-2022