I-graphite yekhwalithi ephezulu inamandla amahle kakhulu emishini, ukuzinza kokushisa, ukuguquguquka okuphezulu kanye nokuhamba okuphezulu kakhulu kwendiza ye-thermal kanye nogesi, okwenza kube enye yezinto ezibaluleke kakhulu ezithuthukisiwe zezinhlelo zokusebenza eziningi ezifana nama-conductor photothermal asetshenziswa njengamabhethri ocingweni. Isibonelo, uhlobo olukhethekile lwe-graphite, i-pyrolytic graphite (HOPG) e-ode kakhulu, ingenye esetshenziswa kakhulu ezindaweni zokucwaninga. Okubalulekile. Lezi zakhiwo ezinhle kakhulu zibangelwa ukwakheka kwe-graphite enezingqimba, lapho izibopho eziqinile ze-covalent phakathi kwama-athomu ekhabhoni ezingqimbeni ze-graphene zifaka isandla ezakhini ezinhle kakhulu zemishini, ukuqhutshwa kwe-thermal kanye nogesi, kuyilapho kuncane kakhulu ukuxhumana phakathi kwezingqimba ze-graphene. Isenzo siphumela ezingeni eliphezulu lokuvumelana nezimo. i-graphite. Nakuba i-graphite iye yatholwa emvelweni iminyaka engaphezu kweyi-1000 futhi ukwakheka kwayo kokwenziwa kuye kwacwaningwa iminyaka engaphezu kweyikhulu, izinga lamasampula e-graphite, emvelo nawokwenziwa, alikho kahle neze. Isibonelo, usayizi wezizinda ezinkulu kakhulu zecrystal graphite ezintweni zegraphite ngokuvamile ungaphansi kuka-1 mm, ohluke kakhulu kusayizi wamakristalu amaningi njengekristalu elilodwa le-quartz kanye nekristalu eyodwa ye-silicon. Usayizi ungafinyelela esikalini semitha. Ubukhulu obuncane kakhulu be-single-crystal graphite bubangelwa ukusebenzisana okubuthakathaka phakathi kwezingqimba ze-graphite, futhi ukuqina kwesendlalelo se-graphene kunzima ukulondoloza ngesikhathi sokukhula, ngakho-ke i-graphite iphulwa kalula ibe yimingcele eminingana yokusanhlamvu eyodwa ye-crystal ekuphazamiseni. . Ukuze kuxazululwe le nkinga eyinhloko, uProfesa Emeritus we-Ulsan National Institute of Science and Technology (UNIST) nabahlanganyeli bakhe uProf. Liu Kaihui, Prof. Wang Enge wasePeking University, kanye nabanye baye bahlongoza isu lokuhlanganisa uhlelo oluncane lwe-magnitude. amakristalu e-graphite eyodwa. ifilimu, phansi esikalini esiyi-intshi. Indlela yabo isebenzisa i-single-crystal nickel foil njenge-substrate, futhi ama-athomu e-carbon anikezwa ngemuva kwe-nickel foil ngokusebenzisa "inqubo ye-isothermal-diffusion-deposition". Esikhundleni sokusebenzisa umthombo wamakhadibhodi wegesi, bakhethe into eqinile yekhabhoni ukuze kube lula ukukhula kwegraphite. Leli su elisha lenza kube nokwenzeka ukukhiqiza amafilimu e-crystal-crystal graphite anogqinsi olungaba yi-intshi engu-1 nama-microns angu-35, noma ngaphezu kwezingqimba ze-graphene ezingu-100,000 ezinsukwini ezimbalwa. Uma kuqhathaniswa nawo wonke amasampula e-graphite atholakalayo, i-single-crystal graphite ine-thermal conductivity ~ 2880 W m-1K-1, okuqukethwe okungabalulekile kokungcola, kanye nebanga elincane phakathi kwezingqimba. (1) Ukuhlanganiswa okuyimpumelelo kwamafilimu e-nickel e-single-crystal anosayizi omkhulu njengoba ama-substrates ayi-ultra-flat egwema ukuphazamiseka kwe-synthetic graphite; (2) Izingqimba eziyi-100,000 ze-graphene zikhuliswa nge-isothermally emahoreni angaba ngu-100, ukuze ungqimba ngalunye lwe-graphene luhlanganiswe endaweni efanayo yamakhemikhali nezinga lokushisa, okuqinisekisa ikhwalithi efanayo yegraphite; (3) Ukunikezwa okuqhubekayo kwekhabhoni ohlangothini olungemuva lwephepha le-nickel kuvumela izingqimba ze-graphene ukuthi zikhule ngokuqhubekayo ngenani eliphakeme kakhulu, cishe ungqimba olulodwa njalo ngemizuzwana emihlanu,”
Isikhathi sokuthumela: Nov-09-2022