Graphene twb paub tias muaj zog heev, txawm tias tsuas yog ib qho atom tuab. Yog li yuav ua li cas thiaj ua tau kom muaj zog dua? Los ntawm tig nws mus rau hauv nplooj ntawv ntawm pob zeb diamond, tau kawg. Cov kws tshawb fawb hauv Kaus Lim Qab Teb tam sim no tau tsim ib txoj hauv kev tshiab los hloov graphene rau hauv cov yeeb yaj kiab pob zeb diamond thinnest, tsis tas yuav siv lub siab.
Graphene, graphite thiab pob zeb diamond yog txhua yam ua los ntawm tib yam khoom - carbon - tab sis qhov sib txawv ntawm cov ntaub ntawv no yog li cas cov pa roj carbon atoms tau npaj thiab sib koom ua ke. Graphene yog ib daim ntawv ntawm cov pa roj carbon uas tsuas yog ib qho atom tuab, nrog kev sib raug zoo ntawm lawv kab rov tav. Graphite yog tsim los ntawm graphene nplooj ntawv sib sau ua ke rau saum ib leeg, nrog cov ntawv cog lus muaj zog hauv txhua daim ntawv tab sis cov tsis muaj zog txuas cov nplooj ntawv sib txawv. Thiab nyob rau hauv pob zeb diamond, cov pa roj carbon atoms muaj kev sib txuas ntau dua nyob rau hauv peb qhov ntev, tsim cov khoom siv nyuaj heev.
Thaum cov kev sib txuas ntawm cov khaubncaws sab nraud povtseg ntawm graphene muaj zog, nws tuaj yeem dhau los ua 2D daim ntawv ntawm pob zeb diamond hu ua diamane. Qhov teeb meem yog, qhov no feem ntau tsis yooj yim ua. Ib txoj hauv kev yuav tsum muaj kev ntxhov siab heev, thiab sai li sai tau thaum lub siab raug tshem tawm cov khoom rov qab mus rau hauv graphene. Lwm cov kev tshawb fawb tau ntxiv hydrogen atoms rau graphene, tab sis qhov ntawd ua rau nws nyuaj rau tswj cov ntawv cog lus.
Rau txoj kev tshawb fawb tshiab, cov kws tshawb fawb ntawm lub koom haum rau Basic Science (IBS) thiab Ulsan National Institute of Science thiab Technology (UNIST) tau pauv cov hydrogen rau fluorine. Lub tswv yim yog tias los ntawm kev nthuav tawm bilayer graphene rau fluorine, nws coj ob txheej los ze zog ua ke, tsim kom muaj kev sib raug zoo ntawm lawv.
Pab pawg tau pib los ntawm kev tsim bilayer graphene siv txoj kev sim-thiab-qhov tseeb ntawm cov tshuaj vapor deposition (CVD), ntawm lub substrate ua los ntawm tooj liab thiab npib tsib xee. Tom qab ntawd, lawv nthuav tawm cov graphene rau cov vapors ntawm xenon difluoride. Cov fluorine nyob rau hauv qhov sib tov ua rau cov pa roj carbon atom, ntxiv dag zog rau kev sib raug zoo ntawm graphene txheej thiab tsim ib txheej ultrathin ntawm fluorinated pob zeb diamond, hu ua F-diamane.
Cov txheej txheem tshiab no yooj yim dua li lwm tus, uas yuav tsum ua kom yooj yim rau kev ntsuas. Ultrathin nplooj ntawm pob zeb diamond tuaj yeem ua rau muaj zog dua, me dua thiab hloov tau yooj yim hauv hluav taws xob, tshwj xeeb tshaj yog qhov sib txawv ntawm qhov sib txawv semi-conductor.
"Txoj kev fluorination yooj yim no ua haujlwm nyob ze ntawm chav tsev kub thiab nyob rau hauv qis qis yam tsis muaj kev siv cov ntshav los yog ib qho kev ua kom muaj roj, yog li txo qhov muaj peev xwm tsim qhov tsis xws luag," hais tias Pavel V. Bakharev, thawj tus sau ntawm txoj kev tshawb no.
Post lub sij hawm: Apr-24-2020