High quality graphite muaj zoo heev mechanical zog, thermal stability, siab yooj thiab siab heev nyob rau hauv lub dav hlau thermal thiab hluav taws xob conductivity, ua rau nws yog ib qho tseem ceeb tshaj plaws cov ntaub ntawv rau ntau daim ntawv thov xws li photothermal conductors siv li roj teeb hauv xov tooj. Piv txwv li, ib hom tshwj xeeb ntawm graphite, uas tau txiav txim siab heev pyrolytic graphite (HOPG), yog ib qho ntawm feem ntau siv hauv chav kuaj. Khoom siv. Cov khoom zoo heev no yog vim cov txheej txheem txheej ntawm graphite, qhov twg muaj zog covalent bonds ntawm cov pa roj carbon atoms nyob rau hauv graphene cov khaubncaws sab nraud povtseg ua rau zoo heev mechanical zog, thermal thiab hluav taws xob conductivity, thaum muaj kev cuam tshuam me ntsis ntawm cov graphene txheej. Qhov kev txiav txim ua rau muaj kev hloov pauv siab. graphite. Txawm hais tias graphite tau pom nyob rau hauv cov xwm txheej rau ntau tshaj 1000 xyoo thiab nws cov khoom siv hluavtaws tau kawm ntau dua 100 xyoo, qhov zoo ntawm cov qauv graphite, ob qho tib si ntuj thiab hluavtaws, yog deb ntawm qhov zoo tagnrho. Piv txwv li, qhov loj ntawm ib qho loj tshaj plaws siv lead ua graphite domains nyob rau hauv graphite cov ntaub ntawv feem ntau yog tsawg tshaj li 1 hli, uas yog nyob rau hauv stark sib piv rau qhov luaj li cas ntawm ntau crystals xws li quartz ib leeg muaju thiab silicon ib leeg muaju. Qhov loj tuaj yeem ncav cuag qhov ntsuas ntawm ib 'meter'. Qhov loj me me ntawm ib leeg-crystal graphite yog vim muaj kev cuam tshuam tsis muaj zog ntawm cov graphite txheej, thiab qhov flatness ntawm graphene txheej yog qhov nyuaj rau kev tswj xyuas thaum lub sij hawm loj hlob, yog li graphite tau yooj yim tawg mus rau hauv ob peb ib leeg-crystal grain ciam teb tsis sib haum. . Txhawm rau daws qhov teeb meem tseem ceeb no, Xib Fwb Emeritus ntawm Ulsan National Institute of Science thiab Technology (UNIST) thiab nws cov neeg koom tes Prof. Liu Kaihui, Prof. Wang Enge ntawm Peking University, thiab lwm tus tau npaj ib lub tswv yim rau kev sib xyaw ua ke nyias-ntawm-qhov loj. graphite ib leeg siv lead ua. zaj duab xis, nqes mus rau nti nplai. Lawv txoj kev siv ib leeg-crystal nickel ntawv ci ua ib qho substrate, thiab cov pa roj carbon atoms tau noj los ntawm lub nraub qaum ntawm nickel foil los ntawm "isothermal dissolution-diffusion-deposition txheej txheem". Hloov chaw ntawm kev siv cov pa roj carbon monoxide, lawv tau xaiv cov khoom siv carbon los pab txhawb kev loj hlob ntawm graphite. Lub tswv yim tshiab no ua rau nws muaj peev xwm tsim ib leeg-crystal graphite zaj duab xis nrog lub thickness ntawm 1 nti thiab 35 microns, los yog ntau tshaj 100,000 graphene txheej hauv ob peb hnub. Piv rau tag nrho cov qauv graphite muaj, ib leeg-crystal graphite muaj cov thermal conductivity ntawm ~ 2880 W m-1K-1, cov ntsiab lus tsis tseem ceeb ntawm impurities, thiab qhov tsawg kawg nkaus ntawm cov khaubncaws sab nraud povtseg. (1) Kev ua tiav zoo ntawm ib leeg-crystal npib tsib xee zaj duab xis ntawm loj loj li ultra-pas substrates zam kev tsis sib haum xeeb ntawm hluavtaws graphite; (2) 100,000 khaubncaws sab nraud povtseg ntawm graphene yog loj hlob isothermally nyob rau hauv txog 100 teev, yog li ntawd txhua txheej ntawm graphene yog synthesized nyob rau hauv tib cov tshuaj ib puag ncig thiab kub, uas ua kom lub uniformity ntawm graphite; (3) Kev xa tawm tas mus li ntawm cov pa roj carbon monoxide los ntawm sab nraub qaum ntawm cov ntawv nyiaj npib tsib xee tso cai rau cov khaubncaws sab nraud povtseg ntawm graphene kom tsis tu ncua loj hlob ntawm tus nqi siab heev, kwv yees li ib txheej txhua tsib vib nas this, "
Post lub sij hawm: Nov-09-2022