ʻO ka hoʻoluʻu ʻana i nā mea uila ikaika i nā smartphones hou loa hiki ke lilo i mea paʻakikī nui. Ua hoʻomohala nā mea noiʻi ma King Abdullah University of Science and Technology i kahi ala wikiwiki a maikaʻi no ka hana ʻana i nā mea kalapona kūpono no ka hoʻopau ʻana i ka wela mai nā mea uila. Hiki ke loaʻa i kēia mea maʻalahi nā noi ʻē aʻe, mai nā mea ʻike kinoea a i nā panela lā.
Nui nā mea uila e hoʻohana i nā kiʻiʻoniʻoni graphite e alakaʻi a hoʻopau i ka wela i hana ʻia e nā mea uila. ʻOiai ʻo ka graphite he ʻano kalapona maoli, ʻo ka hoʻokele wela i ka uila he noi koi a hilinaʻi pinepine i ka hoʻohana ʻana i nā kiʻi ʻoniʻoni micron-mānoanoa kiʻekiʻe. "Akā, ʻo ke ʻano o ka hana ʻana i kēia mau kiʻi kiʻi graphite me ka hoʻohana ʻana i nā polymers ma ke ʻano he mea maka he paʻakikī a ikaika hoʻi ka ikehu," wehewehe ʻo Gitanjali Deokar, kahi postdoc ma ka lab o Pedro Costa nāna i alakaʻi i ka hana. Hana ʻia nā kiʻiʻoniʻoni ma o ke kaʻina hana multi-step e koi ai i nā mahana a hiki i 3,200 degere Celsius a ʻaʻole hiki ke hana i nā kiʻiʻoniʻoni ʻoi aku ka lahilahi ma mua o kekahi mau microns.
Ua hoʻomohala ʻo Deokar, Costa a me kā lākou mau hoa hana i kahi ala wikiwiki a wikiwiki hoʻi no ka hana ʻana i nā pepa graphite ma kahi o 100 nanometers mānoanoa. Ua hoʻohana ka hui i kahi ʻenehana i kapa ʻia ʻo chemical vapor deposition (CVD) e ulu i nā kiʻi kiʻi graphite nanometer-mānoanoa (NGFs) ma luna o ka nickel foil, kahi e hoʻolalelale ai ka nickel i ka hoʻololi ʻana o ka methane wela i graphite ma kona ʻili. "Ua hoʻokō mākou i ka NGF ma kahi 5 mau minuke ulu CVD wale nō ma kahi mahana hopena o 900 degere Celsius," wahi a Deokar.
Hiki i ka NGF ke ulu a hiki i 55 knm2 ka nui a ulu ma nā ʻaoʻao ʻelua o ka foil. Hiki ke hoʻoneʻe ʻia a hoʻoili ʻia i nā ʻaoʻao ʻē aʻe me ka ʻole o ka pono o kahi papa kākoʻo polymer, kahi koi maʻamau i ka wā e hana ai me nā kiʻi ʻoniʻoni graphene hoʻokahi.
Ke hana pū nei me ka loea electron microscopy ʻo Alessandro Genovese, ua loaʻa i ka hui nā kiʻi transmission electron microscopy (TEM) o nā ʻāpana cross-section o NGF ma nickel. "ʻO ka nānā ʻana i ka pilina ma waena o nā kiʻiʻoniʻoni graphite a me ka nickel foil kahi mea i ʻike ʻole ʻia a hāʻawi i nā ʻike hou aʻe i ka ulu ʻana o kēia mau kiʻiʻoniʻoni," wahi a Costa.
Hāʻule ka mānoanoa o NGF ma waena o nā kiʻi graphite mānoanoa micron-mānoanoa i kūʻai ʻia a me ka graphene one-layer. "Hoʻopiha ʻo NGF i ka graphene a me nā pepa graphite ʻoihana, me ka hoʻohui ʻana i ka arsenal o nā kiʻi carbon layered," wahi a Costa. No ka laʻana, ma muli o kona maʻalahi, hiki ke hoʻohana ʻia ʻo NGF no ka hoʻokele wela i nā kelepona paʻakikī e hoʻomaka nei e ʻike ma ka mākeke. "Hoʻohālikelike ʻia me nā kiʻi ʻoniʻoni graphene, ʻoi aku ka liʻiliʻi o ka hoʻohui ʻana o NGF a ʻoi aku ka paʻa," wahi āna.
Eia naʻe, he nui ka hoʻohana ʻana o NGF ma waho o ka wela. ʻO kahi hiʻohiʻona hoihoi i hōʻike ʻia ma nā kiʻi TEM ʻo ia kekahi mau ʻāpana o ka NGF he mau papa kalapona wale nō. "ʻO ka mea kupaianaha, ʻo ka loaʻa ʻana o nā ʻāpana he nui o nā kāʻei graphene e hōʻoia i ka lawa o ka ʻike ʻike ʻia o ka mālamalama i loko o ke kiʻiʻoniʻoni," wahi a Deoka. Ua kuhi ka hui noiʻi e hiki ke hoʻohana ʻia ka NGF conductive, translucent ma ke ʻano he ʻāpana o nā cell solar a i ʻole he mea ʻike no ka ʻike ʻana i ke kinoea nitrogen dioxide. "Hoʻolālā mākou e hoʻohui i ka NGF i nā mea hana i hiki iā ia ke hana ma ke ʻano he mea hana multifunctional," wahi a Costa.
ʻIke hou aʻe: Gitanjali Deokar et al., Ka ulu wikiwiki ʻana o nā kiʻi ʻoniʻoni graphite nanometer-mānoanoa ma ka wafer-scale nickel foil a me kā lākou loiloi hoʻolālā, Nanotechnology (2020). DOI: 10.1088/1361-6528/aba712
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Ka manawa hoʻouna: Sep-05-2024