I-Molybdenum trioxide (i-MoO3) inamandla njengento ebalulekileyo ye-dimensional (2-D), kodwa ukuveliswa kwayo ngobuninzi kuye kwasala emva kwabanye kwiklasi yayo. Ngoku, abaphandi kwi-A * STAR baye baphuhlisa indlela elula yokuvelisa i-ultrathin, i-MoO3 nanosheets ephezulu.

Emva kokufunyanwa kwegraphene, ezinye izixhobo ze-2-D ezifana ne-transition metal di-chalcogenides, zaqala ukutsala umdla omkhulu. Ngokukodwa, i-MoO3 yavela njengento ebalulekileyo ye-2-D ye-semiconducting ngenxa yezinto eziphawulekayo ze-elektroniki kunye ne-optical properties ezibambe isithembiso soluhlu lwezicelo ezintsha kwi-electronics, optoelectronics kunye ne-electrochromics.

U-Liu Hongfei kunye noogxa abavela kwi-A * STAR Institute of Materials Research and Engineering kunye neZiko le-High Performance Computing baye bafuna ukuphuhlisa ubuchule obulula bokuvelisa i-nanosheets ezinkulu, ezikumgangatho ophezulu we-MoO3 eziguquguqukayo kunye nezicacileyo.

"Ii-nanosheets ezincinci ze-atom ye-molybdenum trioxide zineempawu ezintsha ezinokuthi zisetyenziswe kuluhlu lwezicelo ze-elektroniki," utshilo uLiu. Kodwa ukuvelisa iinanosheets ezisemgangathweni, ikristale yomzali kufuneka ibe yecocekile kakhulu.

Ngokuqala ukusebenzisa ubuchule obubizwa ngokuba yi-thermal vapor transport, abaphandi bakhupha i-MoO3 powder kwi-tube-furnace kwi-1,000 degrees Celsius. Emva koko, ngokunciphisa inani leendawo ze-nucleation, zinokuthi zihambelane kangcono ne-thermodynamic crystallization ye-MoO3 ukuvelisa i-crystals ephezulu kwi-600 degrees Celsius ngaphandle kwesidingo se-substrate ethile.

Ngokubanzi, ukukhula kwekristale kumaqondo obushushu aphakamileyo kuchaphazeleka yi-substrate, kuchaza uLiu. "Nangona kunjalo, ngokungabikho kwe-substrate engabom sinokulawula ngcono ukukhula kwekristale, okusivumela ukuba sikhule iikristale ze-molybdenum trioxide zokucoceka okuphezulu kunye nomgangatho."

Emva kokupholisa iikristale kwiqondo lokushisa kwegumbi, abaphandi basebenzisa i-mechanical exfoliation kunye ne-aqueous exfoliation ukuvelisa amabhanti angama-submicron-thick of MoO3 crystals. Emva kokuba befake amabhanti kwi-sonication kunye ne-centrifugation, bakwazi ukuvelisa i-nanosheets ezinkulu, eziphezulu ze-MoO3.

Umsebenzi unikeze ukuqonda okutsha kwintsebenziswano ye-elektroniki ye-interlayer ye-2-D MoO3 nanosheets. Ukukhula kwekristale kunye neendlela zokukhupha eziphuhliswe liqela nazo zinokuba luncedo ekulawuleni i-gap yebhendi-kwaye ngoko ke iipropathi ze-optoelectronic-zezinto ze-2-D ngokwenza i-2-D heterojunctions.

"Ngoku sizama ukwenza i-nanosheets ye-2-D MoO3 eneendawo ezinkulu, kunye nokuphonononga ukusetyenziswa kwazo kwezinye izixhobo, ezifana nezinzwa zegesi," kusho uLiu.