Cov graphite zoo muaj lub zog zoo heev, kev ruaj khov thermal, kev ywj pheej siab thiab kev ua haujlwm thermal thiab hluav taws xob siab heev hauv-dav hlau, ua rau nws yog ib qho ntawm cov khoom siv tseem ceeb tshaj plaws rau ntau daim ntawv thov xws li cov photothermal conductors siv ua roj teeb hauv xov tooj. Piv txwv li, ib hom graphite tshwj xeeb, highly ordered pyrolytic graphite (HOPG), yog ib qho ntawm cov khoom siv feem ntau siv hauv chaw soj nstuam. Cov khoom siv. Cov khoom zoo heev no yog vim muaj cov qauv txheej ntawm graphite, qhov twg cov bonds covalent muaj zog ntawm cov pa roj carbon hauv cov khaubncaws sab nraud povtseg graphene pab txhawb rau cov khoom siv kho tshuab zoo heev, thermal thiab hluav taws xob conductivity, thaum muaj kev sib cuam tshuam me ntsis ntawm cov khaubncaws sab nraud povtseg graphene. Qhov kev ua ua rau muaj kev ywj pheej siab. graphite. Txawm hais tias graphite tau pom nyob rau hauv xwm rau ntau tshaj 1000 xyoo thiab nws cov khoom siv dag tau kawm rau ntau tshaj 100 xyoo, qhov zoo ntawm cov qauv graphite, ob qho tib si ntuj thiab hluavtaws, tsis zoo tagnrho. Piv txwv li, qhov loj ntawm cov graphite domains loj tshaj plaws hauv cov ntaub ntawv graphite feem ntau tsawg dua 1 hli, uas yog qhov sib txawv ntawm qhov loj ntawm ntau cov siv lead ua xws li quartz ib leeg siv lead ua thiab silicon ib leeg siv lead ua. Qhov loj me tuaj yeem ncav cuag qhov ntsuas ntawm ib 'meter'. Qhov me me ntawm cov graphite ib leeg siv lead ua ke yog vim muaj kev sib cuam tshuam tsis zoo ntawm cov txheej graphite, thiab qhov tiaj tiaj ntawm cov txheej graphene nyuaj rau tswj thaum lub sijhawm loj hlob, yog li graphite yooj yim tawg ua ntau qhov ciam teb ntawm cov noob siv lead ua ke hauv kev tsis sib haum xeeb. . Txhawm rau daws qhov teeb meem tseem ceeb no, Xibfwb Emeritus ntawm Ulsan National Institute of Science and Technology (UNIST) thiab nws cov neeg koom tes Prof. Liu Kaihui, Prof. Wang Enge ntawm Peking University, thiab lwm tus tau tawm tswv yim rau kev tsim cov zaj duab xis nyias nyias graphite ib leeg siv lead ua ke. zaj duab xis, nqis mus rau qhov ntsuas nti. Lawv txoj kev siv cov ntawv ci nickel ib leeg siv lead ua ke ua lub substrate, thiab cov pa roj carbon atoms raug pub los ntawm sab nraub qaum ntawm cov ntawv ci nickel los ntawm "isothermal dissolution-diffusion-deposition process". Hloov chaw siv cov ntawv cardboard gaseous, lawv tau xaiv cov khoom siv carbon khov kho los pab txhawb kev loj hlob ntawm graphite. Txoj kev tshiab no ua rau nws muaj peev xwm tsim cov yeeb yaj kiab graphite ib leeg uas muaj qhov tuab li ntawm 1 nti thiab 35 microns, lossis ntau dua 100,000 txheej graphene hauv ob peb hnub. Piv rau txhua cov qauv graphite muaj, cov graphite ib leeg muaj cov thermal conductivity ntawm ~ 2880 W m-1K-1, cov ntsiab lus tsis tseem ceeb ntawm cov khoom tsis huv, thiab qhov deb tsawg kawg nkaus ntawm cov txheej. (1) Kev ua tiav ntawm cov yeeb yaj kiab nickel ib leeg uas muaj qhov loj me raws li cov khoom siv ultra-flat tiv thaiv kev cuam tshuam ntawm cov graphite tsim; (2) 100,000 txheej ntawm graphene raug loj hlob isothermally hauv li 100 teev, yog li txhua txheej ntawm graphene raug tsim hauv tib qho chaw ib puag ncig tshuaj lom neeg thiab qhov kub, uas ua kom muaj qhov zoo sib xws ntawm graphite; (3) Kev muab cov pa roj carbon txuas ntxiv mus los ntawm sab nraud ntawm cov ntawv ci nickel tso cai rau cov txheej ntawm graphene kom txuas ntxiv loj hlob ntawm tus nqi siab heev, kwv yees li ib txheej txhua tsib vib nas this, "
Lub sijhawm tshaj tawm: Kaum Ib Hlis-09-2022