Graphene twb paub lawm tias muaj zog heev, txawm tias nws tsuas yog ib lub atom tuab xwb. Yog li ntawd, yuav ua li cas thiaj ua rau nws muaj zog dua? Los ntawm kev hloov nws mus rau hauv cov ntawv pob zeb diamond, tau kawg. Cov kws tshawb fawb hauv Kaus Lim Qab Teb tam sim no tau tsim ib txoj hauv kev tshiab rau kev hloov graphene mus rau hauv cov yeeb yaj kiab pob zeb diamond nyias tshaj plaws, yam tsis tas yuav siv lub zog siab.
Graphene, graphite thiab pob zeb diamond yog ua los ntawm tib yam khoom - carbon - tab sis qhov txawv ntawm cov ntaub ntawv no yog li cas cov carbon atoms tau teeb tsa thiab sib txuas ua ke. Graphene yog ib daim ntawv ntawm carbon uas tsuas yog ib qho atom tuab, nrog cov kev sib txuas muaj zog ntawm lawv kab rov tav. Graphite yog ua los ntawm cov ntawv graphene sib sau ua ke saum toj ntawm ib leeg, nrog cov kev sib txuas muaj zog hauv txhua daim ntawv tab sis cov tsis muaj zog txuas cov ntawv sib txawv. Thiab hauv pob zeb diamond, cov carbon atoms tau txuas nrog muaj zog dua hauv peb qhov ntev, tsim cov khoom siv tawv heev.
Thaum cov kev sib txuas ntawm cov txheej ntawm graphene tau ua kom muaj zog, nws tuaj yeem dhau los ua daim ntawv 2D ntawm pob zeb diamond hu ua diamane. Qhov teeb meem yog, qhov no feem ntau tsis yooj yim ua. Ib txoj hauv kev xav tau kev siab heev, thiab thaum lub siab ntawd raug tshem tawm cov khoom siv rov qab mus rau hauv graphene. Lwm cov kev tshawb fawb tau ntxiv cov hydrogen atoms rau hauv graphene, tab sis qhov ntawd ua rau nws nyuaj rau tswj cov kev sib txuas.
Rau txoj kev tshawb fawb tshiab, cov kws tshawb fawb ntawm Lub Tsev Kawm Ntawv rau Kev Tshawb Fawb Qib Siab (IBS) thiab Ulsan National Institute of Science and Technology (UNIST) tau pauv hydrogen rau fluorine. Lub tswv yim yog tias los ntawm kev nthuav tawm bilayer graphene rau fluorine, nws coj ob txheej ze zog ua ke, tsim kom muaj kev sib raug zoo ntawm lawv.
Cov pab neeg tau pib los ntawm kev tsim cov graphene bilayer siv txoj kev sim thiab muaj tseeb ntawm kev tso cov pa tshuaj lom neeg (CVD), rau ntawm cov substrate ua los ntawm tooj liab thiab nickel. Tom qab ntawd, lawv tau muab cov graphene rau cov pa ntawm xenon difluoride. Cov fluorine hauv qhov sib tov ntawd lo rau cov pa roj carbon, ua kom cov kev sib txuas ntawm cov txheej graphene muaj zog thiab tsim ib txheej ultrathin ntawm cov pob zeb diamond fluorinated, hu ua F-diamane.
Cov txheej txheem tshiab no yooj yim dua li lwm cov, uas yuav tsum ua rau nws yooj yim rau kev nthuav dav. Cov ntawv pob zeb diamond nyias nyias tuaj yeem ua rau cov khoom siv hluav taws xob muaj zog dua, me dua thiab yoog tau dua, tshwj xeeb tshaj yog ua lub semi-conductor dav dav.
"Txoj kev fluorination yooj yim no ua haujlwm ntawm qhov kub thiab txias ze rau chav tsev thiab nyob rau hauv qhov siab qis yam tsis siv cov plasma lossis cov txheej txheem ua kom muaj roj, yog li ntawd txo qhov ua tau ntawm kev tsim cov teeb meem," Pavel V. Bakharev, thawj tus sau ntawm txoj kev tshawb fawb hais.
Lub sijhawm tshaj tawm: Plaub Hlis-24-2020