Molybdenum trioxide (MoO3) ili ndi kuthekera ngati chinthu chofunikira cha mbali ziwiri (2-D), koma kupanga kwake kwakukulu kwatsalira kumbuyo kwa ena m'kalasi mwake. Tsopano, ofufuza a A * STAR apanga njira yosavuta yopangira ma ultrathin, apamwamba kwambiri a MoO3 nanosheets.

Kutsatira kupezeka kwa graphene, zida zina za 2-D monga transition metal di-chalcogenides, zidayamba kukopa chidwi. Makamaka, MoO3 idatuluka ngati chinthu chofunikira cha 2-D semiconducting chifukwa champhamvu zake zamagetsi komanso zowoneka bwino zomwe zimakhala ndi malonjezano amitundu ingapo yamapulogalamu amagetsi, ma optoelectronics ndi ma electrochromics.

Liu Hongfei ndi ogwira nawo ntchito ku A*STAR Institute of Materials Research and Engineering ndi Institute of High Performance Computing ayesetsa kupanga njira yosavuta yopangira misa ma nanosheets akulu, apamwamba kwambiri a MoO3 omwe ndi osinthika komanso owonekera.

"Ma nanosheets oonda kwambiri a molybdenum trioxide ali ndi zinthu zatsopano zomwe zitha kugwiritsidwa ntchito pamagetsi osiyanasiyana," akutero Liu. "Koma kuti apange ma nanosheets abwino, kristalo ya makolo iyenera kukhala yoyera kwambiri."

Poyamba kugwiritsa ntchito njira yotchedwa thermal vapor transport, ofufuzawo adatulutsa ufa wa MoO3 mu ng'anjo ya chubu pa 1,000 digiri Celsius. Kenaka, pochepetsa chiwerengero cha malo a nucleation, amatha kufanana bwino ndi thermodynamic crystallization ya MoO3 kuti apange makristasi apamwamba pa 600 digiri Celsius popanda kufunikira kwa gawo lapansi.

"Kawirikawiri, kukula kwa kristalo pa kutentha kwakukulu kumakhudzidwa ndi gawo lapansi," akufotokoza Liu. "Komabe, pakapanda gawo laling'ono ladala titha kuwongolera kukula kwa kristalo, kutilola kukulitsa makhiristo a molybdenum trioxide oyera komanso abwino kwambiri."

Atatha kuziziritsa makhiristo mpaka kutentha kwa chipinda, ofufuzawo adagwiritsa ntchito makina komanso kutulutsa kwamadzi kuti apange malamba amtundu wa MoO3. Atangopereka malamba ku sonication ndi centrifugation, anatha kupanga zazikulu, zapamwamba za MoO3 nanosheets.

Ntchitoyi yapereka zidziwitso zatsopano mu interlayer electronic interactions of 2-D MoO3 nanosheets. Kukula kwa kristalo ndi njira zowonongeka zomwe gululi limapanga zingathandizenso kusintha kusiyana kwa gulu-ndipo chifukwa chake mawonekedwe a optoelectronic-a zipangizo za 2-D popanga 2-D heterojunctions.

"Tsopano tikuyesera kupanga 2-D MoO3 nanosheets ndi madera akuluakulu, komanso kufufuza momwe angagwiritsire ntchito zipangizo zina, monga magetsi a gasi," akutero Liu.