Igraphene sele isaziwa ngokuba yomelele ngendlela emangalisayo, ngaphandle nje kokuba i-athomu enye. Ngoko inokwenziwa njani yomelele ngakumbi? Ngokuyijika ibe ngamashiti edayimani, kunjalo. Abaphandi eMzantsi Korea ngoku baphuhlise indlela entsha yokuguqula igraphene ibe ziifilimu zedayimani ezibhityileyo, ngaphandle kokusebenzisa uxinzelelo oluphezulu.
Igraphene, igraphite kunye nedayimane zonke zenziwe ngezinto ezifanayo - ikhabhoni - kodwa umahluko phakathi kwezi zixhobo yindlela iiathom zekhabhoni ezilungelelaniswe ngayo kwaye zidityaniswe kunye. Igraphene lishiti lekhabhoni eliyi-athomu enye etyebileyo, enamaqhina aqinileyo phakathi kwawo ngokuthe tye. Igraphite yenziwe ngamaphepha egraphene apakishwe ngaphezulu kwelinye, aneebhondi ezomeleleyo ngaphakathi kwiphepha ngalinye kodwa abuthathaka adibanisa amaphepha ahlukeneyo. Kwaye kwidayimani, iiathom zekhabhoni ziqhagamshelwe ngamandla ngakumbi kwimilinganiselo emithathu, zenza imathiriyeli enzima kakhulu.
Xa amaqhina phakathi kweeleya zegraphene zomelezwa, inokuba luhlobo lwedayimane lwe-2D eyaziwa ngokuba yi-diamane. Ingxaki kukuba, oku ngokuqhelekileyo akulula ukukwenza. Enye indlela ifuna uxinzelelo oluphezulu kakhulu, kwaye nje ukuba olo xinzelelo lususiwe izinto zibuyela kwigraphene. Olunye uphononongo longeze iiathom zehydrogen kwigraphene, kodwa oko kwenza kube nzima ukulawula iibhondi.
Kuphononongo olutsha, abaphandi kwiZiko leSayensi esiSiseko (IBS) kunye ne-Ulsan National Institute of Science and Technology (UNIST) batshintshe i-hydrogen kwi-fluorine. Umbono kukuba ngokuveza i-bilayer graphene kwi-fluorine, izisa iileya ezimbini zisondelelane, zidale amaqhina anamandla phakathi kwawo.
Iqela laqala ngokudala i-bilayer graphene isebenzisa indlela ezamayo kunye neyinyani ye-chemical vapor deposition (CVD), kwi-substrate eyenziwe ngobhedu kunye ne-nickel. Emva koko, babonisa igraphene kumphunga we-xenon difluoride. Ifluorine kulo mxube incamathela kwiiathom zekhabhoni, iqinisa amaqhina phakathi kwamaleko egraphene kunye nokudala umaleko we-ultrathin wedayimane efluorinated, eyaziwa ngokuba yi-F-diamane.
Inkqubo entsha ilula kakhulu kunezinye, ekufuneka yenze kube lula ukunyusa. Amashiti e-Ultrathin edayimani anokwenza amandla, amancinci kwaye abhetyebhetye ngakumbi amacandelo e-elektroniki, ngakumbi njenge-wide-gap semi-conductor.
"Le ndlela elula ye-fluorination isebenza kwiqondo lokushisa elikufutshane negumbi kwaye phantsi koxinzelelo oluphantsi ngaphandle kokusetyenziswa kweplasma okanye nayiphi na indlela yokusebenza kwegesi, ngoko ke iyanciphisa amathuba okudala iziphene," kusho uPavel V. Bakharev, umbhali wokuqala wokufunda.
Ixesha lokuposa: Epreli-24-2020