Molybdenum trioxide (MoO3) ine mukana sechinhu chakakosha chemativi maviri (2-D), asi kugadzirwa kwayo kwakawanda kwakasarira kumashure kwevamwe mukirasi yayo. Ikozvino, vaongorori veA * STAR vakagadzira nzira iri nyore yekugadzira misa ultrathin, yepamusoro-mhando MoO3 nanosheets.

Kutevera kuwanikwa kwegraphene, zvimwe zvinhu zve2-D senge transition metal di-chalcogenides, zvakatanga kukwezva kutarisisa. Kunyanya, MoO3 yakabuda seyakakosha 2-D semiconducting zvinhu nekuda kweayo anoshamisa emagetsi uye optical zvivakwa zvine vimbiso yemhando yezvitsva zvekushandisa mumagetsi, optoelectronics uye electrochromics.

Liu Hongfei nevamwe vaanoshanda navo kubva kuA*STAR Institute of Materials Research and Engineering neInstitute of High Performance Computing vakatsvaga kugadzirwa nzira iri nyore yekugadzira mahombe, emhando yepamusoro nanosheets eMoO3 anochinjika uye ari pachena.

"Atomically nanosheets matete e molybdenum trioxide ane zvinhu zvitsva zvinogona kushandiswa mumhando dzakasiyana dzemagetsi," anodaro Liu. "Asi kuti ugadzire nanosheets akanaka, kristaro yemubereki inofanira kunge ine hutsanana hwepamusoro."

Nekutanga kushandisa nzira inonzi thermal vapor transport, vatsvakurudzi vakabudisa MoO3 hupfu muchubhu-choto pa1,000 degrees Celsius. Zvadaro, nekuderedza nhamba yenzvimbo dze nucleation, vaigona kunyatsofananidza thermodynamic crystallization yeMoO3 kuti ibudise makristasi emhando yepamusoro pa600 degrees Celsius pasina kudiwa kweimwe substrate.

"Kazhinji, kukura kwekristaro pakupisa kwakakwira kunokanganiswa neiyo substrate," anotsanangura Liu. "Zvisinei, nekushaikwa kwemaune substrate tinogona kudzora zvirinani kukura kwekristaro, zvichitibvumira kukura molybdenum trioxide makristasi ekuchena kwepamusoro uye mhando."

Mushure mekutonhodza makristasi kune tembiricha yekamuri, vaongorori vakashandisa mechanical uye aqueous exfoliation kugadzira submicron-gobvu mabhandi eMoO3 makristasi. Pavakangoisa mabhanhire kune sonication uye centrifugation, vakakwanisa kugadzira makuru, emhando yepamusoro MoO3 nanosheets.

Iro basa rakapa ruzivo rutsva mukati me interlayer electronic interaction ye 2-D MoO3 nanosheets. Kukura kwekristaro uye maitiro ekubvisa akagadzirwa nechikwata anogona zvakare kubatsira mukugadzirisa bhendi gap-uye naizvozvo optoelectronic properties-ye2-D zvinhu nekugadzira 2-D heterojunctions.

"Isu tava kuedza kugadzira 2-D MoO3 nanosheets nenzvimbo dzakakura, pamwe nekuongorora kushandiswa kwavo mune zvimwe zvigadzirwa, zvakadai semagetsi emagetsi," anodaro Liu.