ʻO ka hoʻoluʻu ʻana i nā mea uila ikaika i loko o nā kelepona akamai hou loa he pilikia nui ia. Ua hoʻomohala nā kānaka noiʻi ma ke Kulanui ʻEpekema a me ka ʻenehana ʻo King Abdullah i kahi ʻano hana wikiwiki a maikaʻi hoʻi no ka hana ʻana i nā mea kalapona kūpono no ka hoʻokuʻu ʻana i ka wela mai nā mea uila. Hiki i kēia mea hana ke loaʻa nā hoʻohana ʻē aʻe, mai nā mea ʻike kinoea a i nā panela solar.
Hoʻohana ka nui o nā mea uila i nā kiʻiʻoniʻoni graphite e alakaʻi a hoʻokuʻu i ka wela i hana ʻia e nā ʻāpana uila. ʻOiai ʻo ka graphite kahi ʻano kūlohelohe o ke kalapona, ʻo ka hoʻokele wela i loko o nā mea uila he noi koi a hilinaʻi pinepine ia i ka hoʻohana ʻana i nā kiʻiʻoniʻoni graphite micron-mānoanoa kiʻekiʻe. "Eia nō naʻe, ʻo ke ʻano o ka hana ʻana i kēia mau kiʻiʻoniʻoni graphite me ka hoʻohana ʻana i nā polymers ma ke ʻano he mea maka he paʻakikī a hoʻohana nui i ka ikehu," wahi a Gitanjali Deokar, he postdoc ma ka lab ʻo Pedro Costa nāna i alakaʻi i ka hana. Hana ʻia nā kiʻiʻoniʻoni ma o kahi kaʻina hana multi-step e koi ana i nā mahana a hiki i 3,200 degere Celsius a ʻaʻole hiki ke hana i nā kiʻiʻoniʻoni lahilahi ma mua o kekahi mau microns.
Ua hoʻomohala ʻo Deokar, Costa a me kā lākou mau hoa hana i kahi ʻano hana wikiwiki a me ka ikehu no ka hana ʻana i nā pepa graphite ma kahi o 100 nanometers ka mānoanoa. Ua hoʻohana ka hui i kahi ʻano hana i kapa ʻia ʻo chemical vapor deposition (CVD) e ulu i nā kiʻiʻoniʻoni graphite nanometer-mānoanoa (NGFs) ma ka pepa nickel, kahi e hoʻoulu ai ka nickel i ka hoʻololi ʻana o ka methane wela i graphite ma luna o kona ʻili. "Ua hoʻokō mākou i ka NGF i loko o kahi ʻanuʻu ulu CVD 5-minuke ma kahi mahana hopena o 900 degere Celsius," wahi a Deokar.
Hiki i ka NGF ke ulu i loko o nā pepa a hiki i 55 cm2 ka nui a ulu ma nā ʻaoʻao ʻelua o ka foil. Hiki ke wehe ʻia a hoʻoili ʻia i nā ʻili ʻē aʻe me ka ʻole o ka pono no kahi papa kākoʻo polymer, he koi maʻamau ia i ka wā e hana ana me nā kiʻiʻoniʻoni graphene papa hoʻokahi.
Ma ka hana pū ʻana me ka loea microscopy electron ʻo Alessandro Genovese, ua loaʻa i ka hui nā kiʻi microscopy electron hoʻoili (TEM) o nā ʻāpana kea o NGF ma ka nickel. "ʻO ka nānā ʻana i ka pilina ma waena o nā kiʻiʻoniʻoni graphite a me ka pepa nickel he mea i ʻike mua ʻole ʻia a e hāʻawi i nā ʻike hou aʻe i ke ʻano ulu o kēia mau kiʻiʻoniʻoni," wahi a Costa.
ʻO ka mānoanoa o NGF e hāʻule ma waena o nā kiʻiʻoniʻoni graphite micron-mānoanoa i loaʻa ma ke kālepa a me ka graphene papa hoʻokahi. "Hoʻopiha ka NGF i ka graphene a me nā pepa graphite ʻoihana, e hoʻohui ana i ka arsenal o nā kiʻiʻoniʻoni kalapona papa," wahi a Costa. No ka laʻana, ma muli o kona maʻalahi, hiki ke hoʻohana ʻia ʻo NGF no ka hoʻokele wela i nā kelepona paʻalima maʻalahi e hoʻomaka nei e ʻike ʻia ma ka mākeke. "Ke hoʻohālikelike ʻia me nā kiʻiʻoniʻoni graphene, ʻoi aku ka liʻiliʻi o ke kumukūʻai a me ka paʻa o ka hoʻohui ʻana o NGF," i hoʻohui ai ʻo ia.
Eia nō naʻe, he nui nā hoʻohana a NGF ma mua o ka hoʻopuehu ʻana i ka wela. ʻO kahi hiʻohiʻona hoihoi i hōʻike ʻia ma nā kiʻi TEM, ʻo ia kekahi mau ʻāpana o ka NGF he mau papa wale nō o ke kalapona ka mānoanoa. "ʻO ka mea kupaianaha, ʻo ka loaʻa ʻana o nā papa he nui o nā kikowaena graphene e hōʻoiaʻiʻo ana i kahi lawa o ka mālamalama ʻike ʻia ma loko o ke kiʻiʻoniʻoni," wahi a Deoka. Ua kuhiakau 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 iā NGF i loko o nā mea hana i hiki ai iā ia ke hana ma ke ʻano he mea hana multifunctional," wahi a Costa.
ʻIke hou aku: Gitanjali Deokar et al., Ka ulu wikiwiki ʻana o nā kiʻiʻoniʻoni graphite nanometer-mānoanoa ma ka pepa nickel wafer-scale a me kā lākou loiloi kūkulu, Nanotechnology (2020). DOI: 10.1088/1361-6528/aba712
Inā loaʻa iā ʻoe kahi typo, hewa, a i ʻole makemake ʻoe e waiho i kahi noi e hoʻoponopono i ka ʻike ma kēia ʻaoʻao, e ʻoluʻolu e hoʻohana i kēia palapala. No nā nīnau maʻamau, e ʻoluʻolu e hoʻohana i kā mākou palapala hoʻokaʻaʻike. No ka manaʻo maʻamau, e hoʻohana i ka ʻāpana manaʻo lehulehu ma lalo (e hahai i nā kuhikuhi).
He mea nui kou manaʻo iā mākou. Eia nō naʻe, ma muli o ka nui o nā leka, ʻaʻole hiki iā mākou ke hōʻoia i kahi pane pilikino.
Hoʻohana wale ʻia kāu leka uila e haʻi i ka poʻe i hoʻouna mai i ka leka uila. ʻAʻole e hoʻohana ʻia kou helu wahi a me ka helu wahi o ka mea loaʻa no kekahi kumu ʻē aʻe. E ʻike ʻia ka ʻike āu e hoʻokomo ai i kāu leka uila a ʻaʻole e mālama ʻia e Phys.org ma kekahi ʻano.
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Ka manawa hoʻouna: Sep-05-2024