Loaʻa i ka Molybdenum trioxide (MoO3) he mea koʻikoʻi ʻelua-dimensional (2-D), akā ua emi kāna hana nui ma hope o nā mea ʻē aʻe o kāna papa. I kēia manawa, ua hoʻomohala ka poʻe noiʻi ma A*STAR i kahi ala maʻalahi no ka hana nui ʻana i nā ultrathin, kiʻekiʻe kiʻekiʻe MoO3 nanosheets.

Ma hope o ka loaʻa ʻana o ka graphene, ua hoʻomaka nā mea 2-D ʻē aʻe e like me ka transition metal di-chalcogenides, e huki nui i ka nānā. ʻO ka mea nui, ua puka mai ʻo MoO3 ma ke ʻano he mea koʻikoʻi 2-D semiconducting ma muli o kāna mau mea uila a me nā waiwai optical e paʻa ana i ka ʻōlelo hoʻohiki no ka nui o nā noi hou i ka uila, optoelectronics a me electrochromics.

Ua ʻimi ʻo Liu Hongfei a me nā hoa hana mai ka A*STAR Institute of Materials Research and Engineering a me Institute of High Performance Computing e hoʻomohala i kahi ʻenehana maʻalahi no ka hana nui ʻana i nā nanosheets kiʻekiʻe o MoO3 i maʻalahi a ʻike.

"Atomically thin nanosheets of molybdenum trioxide loaʻa nā waiwai hou i hiki ke hoʻohana ʻia i nā ʻano o nā noi uila," wahi a Liu. "Akā, no ka hana ʻana i nā nanosheets maikaʻi, pono ke kiʻekiʻe o ka kristal makua."

Ma ka hoʻohana mua ʻana i kahi ʻenehana i kapa ʻia ʻo thermal vapor transport, ua hoʻoheheʻe ka poʻe noiʻi i ka pauka MoO3 i loko o ka umu ahi ma 1,000 degere Celsius. A laila, ma ka hōʻemi ʻana i ka helu o nā kahua nucleation, hiki iā lākou ke hoʻohālikelike i ka crystallization thermodynamic o MoO3 e hana i nā kristal kiʻekiʻe ma 600 degere Celsius me ka ʻole o kahi substrate kikoʻī.

"Ma keʻano laulā, hoʻopili ʻia ka ulu ʻana o ke aniani i nā mahana kiʻekiʻe e ka substrate," wehewehe ʻo Liu. "Akā, inā ʻaʻole kahi substrate i manaʻo ʻia, hiki iā mākou ke hoʻomalu maikaʻi i ka ulu aniani, e ʻae iā mākou e ulu i nā kristal molybdenum trioxide o ka maʻemaʻe a me ka maikaʻi."

Ma hope o ka hoʻoluʻu ʻana i nā kristal i ka lumi wela, ua hoʻohana nā mea noiʻi i ka exfoliation mechanical a me ka wai e hana i nā kāʻei submicron-mānoanoa o nā kristal MoO3. I ka manawa a lākou i hoʻokau ai i nā kāʻei i ka sonication a me ka centrifugation, ua hiki iā lākou ke hana i nā nanosheets MoO3 kiʻekiʻe.

Ua hāʻawi ka hana i nā ʻike hou i ka pilina uila interlayer o 2-D MoO3 nanosheets. Hiki ke kōkua ʻia ka ulu ʻana o ke aniani a me nā ʻenehana exfoliation i hoʻomohala ʻia e ka hui i ka hoʻoponopono ʻana i ka ʻāpana band-a no laila nā waiwai optoelectronic-o nā mea 2-D ma ka hana ʻana i nā heterojunctions 2-D.

"Ke ho'āʻo nei mākou i kēia manawa e hana i nā nanosheets 2-D MoO3 me nā wahi ʻoi aku ka nui, a me ka ʻimi ʻana i kā lākou hiki ke hoʻohana i nā mea ʻē aʻe, e like me nā mea ʻike kinoea," wahi a Liu.