Molybdenum trioxide (MoO3) waxay leedahay awood ahaan shay laba-geesood ah oo muhiim ah (2-D), laakiin wax-soo-saarkeeda badan ayaa dib uga dhacay kuwa kale ee fasalka dhexdiisa. Hadda, cilmi-baarayaasha A*STAR waxay soo saareen hab fudud oo loogu talagalay soo saarista ultrathin, tayada sare leh ee MoO3 nanosheets.

Ka dib markii la helay graphene, qalabyada 2-D ee kale sida birta kala-guurka di-chalcogenides, waxay bilaabeen inay soo jiitaan dareen la taaban karo. Gaar ahaan, MoO3 waxay u soo baxday inay tahay qalab semiconducting 2-D oo muhiim ah sababtoo ah sifooyinkeeda elegtarooniga ah ee cajiibka ah iyo kuwa indhaha ah ee haya ballan-qaadyo badan oo ah codsiyo cusub oo elektiroonig ah, optoelectronics iyo electrochromics.

Liu Hongfei iyo asxaabtiisa A * STAR Machadka Qalabka Cilmi-baarista iyo Injineerinka iyo Machadka Xisaabinta Waxqabadka Sare waxay rabeen inay horumariyaan farsamo fudud oo ballaaran oo soo saara nanosheets tayo sare leh oo MoO3 ah oo dabacsan oo hufan.

"Nanosheet-ka dhuuban ee molybdenum trioxide waxay leeyihiin waxyaabo cusub oo loo isticmaali karo codsiyo kala duwan oo elegtaroonig ah," ayuu yidhi Liu. "Laakin si loo soo saaro nanosheets tayo fiican leh, kiristaanka waalidku waa inuu ahaadaa mid nadiif ah oo aad u sarreeya."

Markii ugu horeysay ee la isticmaalo farsamada loo yaqaan gaadiidka uumiga kuleylka, cilmi-baarayaashu waxay uumi-bixiyeen budada MoO3 ee foornada tuubada 1,000 darajo Celsius. Dabadeed, iyadoo la dhimayo tirada goobaha nukliyeerka, waxay si fiican ugu habboonaan karaan crystallization thermodynamic ee MoO3 si ay u soo saaraan kareemooyin tayo sare leh oo ah 600 darajo Celsius iyada oo aan loo baahnayn substrate gaar ah.

"Guud ahaan, koritaanka crystal ee heerkulka sare waxaa saameeya substrate-ka," ayuu yiri Liu. "Si kastaba ha ahaatee, maqnaanshaha substrate ula kac ah waxaan si fiican u xakameyn karnaa kobaca crystal, taas oo noo ogolaaneysa inaan korno molybdenum trioxide crystals oo nadiif ah iyo tayo sare leh."

Ka dib markii la qaboojiyey kiristaalo heerkulka qolka, cilmi-baarayaashu waxay isticmaaleen nadiifinta makaanikada iyo biyaha si ay u soo saaraan suumanka dhumuc-yar ee moO3 crystals. Marka ay hoos u dhigaan suunka sonication iyo centrifugation, waxay awoodeen inay soo saaraan nanosheets MoO3 tayo sare leh oo waaweyn.

Shaqadu waxay siisay fikrado cusub oo ku saabsan isdhexgalka elegtarooniga ah ee isdhexgalka ee 2-D MoO3 nanosheets. Farsamooyinka korriinka iyo korriinka korriinka ee ay sameeyeen kooxdu waxay sidoo kale waxtar u yeelan kartaa wax ka qabashada farqiga u dhexeeya band-iyo sidaas darteed sifooyinka indhaha-ee qalabka 2-D iyadoo la samaynayo 2-D heterojunctions.

"Waxaan hadda isku dayeynaa inaan abuurno 2-D MoO3 nanosheets oo leh meelo waaweyn, iyo sidoo kale sahaminta isticmaalka suurtagalka ah ee aaladaha kale, sida dareemayaasha gaaska," ayuu yiri Liu.