Loaʻa i ka graphite kiʻekiʻe ka ikaika mechanical maikaʻi loa, ke kūpaʻa wela, ka loli kiʻekiʻe a kiʻekiʻe loa i ka mokulele a me ka conductivity uila, hana ia i kekahi o nā mea holomua koʻikoʻi no nā noi he nui e like me nā conductors photothermal i hoʻohana ʻia e like me nā pihi ma nā kelepona. No ka laʻana, ʻo kahi ʻano graphite kūikawā, ka pyrolytic graphite i kauoha nui ʻia (HOPG), ʻo ia kekahi o nā mea maʻamau i hoʻohana ʻia i nā laboratories. Mea waiwai. ʻO kēia mau waiwai maikaʻi loa ma muli o ke ʻano papa o ka graphite, kahi i hoʻopaʻa ʻia ai nā paʻa covalent ikaika ma waena o nā ʻātoma kalapona i nā papa graphene i nā waiwai mechanical maikaʻi loa, ka wela a me ka conductivity uila, ʻoiai ka liʻiliʻi o ka pilina ma waena o nā papa graphene. Loaʻa ka hana i kahi kiʻekiʻe o ka maʻalahi. graphite. ʻOiai ua ʻike ʻia ka graphite ma ke ʻano ma mua o 1000 mau makahiki a ua aʻo ʻia kāna synthesis artificial no nā makahiki ʻoi aku ma mua o 100, ʻo ka maikaʻi o nā hōʻailona graphite, nā mea kūlohelohe a me ka synthetic, ʻaʻole i kūpono. No ka laʻana, ʻoi aku ka liʻiliʻi ma mua o 1 mm ka nui o nā kikowaena graphite kristal nui loa i loko o nā mea graphite, he ʻokoʻa loa ia i ka nui o nā kristal he nui e like me ka quartz single crystals a me ka silicon single crystals. Hiki i ka nui ke hiki i ka unahi o ka mika. ʻO ka liʻiliʻi liʻiliʻi o ka graphite hoʻokahi-crystal ma muli o ka nawaliwali o ka pilina ma waena o nā papa graphite, a paʻakikī ka palahalaha o ka papa graphene i ka wā e ulu ana, no laila ua maʻalahi ka graphite i nā palena palaoa hoʻokahi i ka pilikia. . No ka hoʻoponopono ʻana i kēia pilikia koʻikoʻi, ua hāʻawi ʻo Professor Emeritus o ka Ulsan National Institute of Science and Technology (UNIST) a me kāna mau hoa hana ʻo Prof. Liu Kaihui, Prof. Wang Enge o ke Kulanui o Peking, a me nā mea ʻē aʻe i hoʻolālā i kahi hoʻolālā no ka hoʻohui ʻana i ka ʻāpana lahilahi. graphite hoʻokahi kristal. kiʻiʻoniʻoni, iho i ka pālākiō ʻīniha. Ke hoʻohana nei kā lākou ʻano i kahi pahu nickel kristal hoʻokahi ma ke ʻano he substrate, a ua hānai ʻia nā ʻātoma kalapona mai ke kua o ka nickel foil ma o ka "isothermal dissolution-diffusion-deposition process". Ma mua o ka hoʻohana ʻana i kahi kumu pahu pahu hau, ua koho lākou i kahi mea kalapona paʻa e hoʻoikaika i ka ulu ʻana o ka graphite. Hiki i kēia hoʻolālā hou ke hana i nā kiʻi kiʻi ʻoniʻoni kalakala hoʻokahi me ka mānoanoa ma kahi o 1 iniha a me 35 microns, a i ʻole ma mua o 100,000 mau papa graphene i loko o kekahi mau lā. Ke hoʻohālikelike ʻia me nā ʻāpana graphite āpau i loaʻa, loaʻa ka graphite hoʻokahi-crystal i ka thermal conductivity o ~ 2880 W m-1K-1, kahi ʻike liʻiliʻi o nā haumia, a me kahi mamao liʻiliʻi ma waena o nā papa. (1) ʻO ka hoʻohui maikaʻi ʻana o nā kiʻi ʻoniʻoni nickel hoʻokahi o ka nui nui me ka pale ʻana o nā substrates ultra-flat i ka hoʻokaʻawale ʻana o ka graphite synthetic; (2) 100,000 papa o ka graphene ua ulu isothermally ma kahi o 100 hola, no laila kēlā me kēia papa o ka graphene i synthesized i loko o ka like kemika kaiapuni a me ka mahana, e hōʻoiaʻiʻo i ka like like o ka graphite; (3) ʻO ka hāʻawi mau ʻana o ke kalapona ma ka ʻaoʻao hope o ka nickel foil e hiki ai i nā papa graphene ke ulu mau i kahi kiʻekiʻe loa, ma kahi o hoʻokahi papa i kēlā me kēia ʻelima kekona, "
Ka manawa hoʻouna: Nov-09-2022