1, mechanical stripping txoj kev
Mechanical stripping method yog ib txoj hauv kev kom tau txais graphene nyias-txheej cov ntaub ntawv los ntawm kev siv kev sib txhuam thiab kev sib txheeb ntawm cov khoom thiab graphene. Txoj kev no yooj yim rau kev khiav lag luam, thiab cov graphene tau txais feem ntau ua kom tiav cov qauv siv lead ua. Xyoo 2004, ob tus kws tshawb fawb Askiv tau siv daim kab xev pob tshab los tev tawm cov txheej txheem graphite los ntawm txheej kom tau txais graphene, uas kuj tau muab cais ua cov txheej txheem stripping. Txoj kev no yog ib zaug suav hais tias tsis muaj txiaj ntsig thiab tsis tuaj yeem ua rau ntau lawm.
Nyob rau hauv xyoo tas los no, kev lag luam tau ua ntau yam kev tshawb fawb thiab kev tsim kho tshiab hauv kev tsim cov graphene. Tam sim no, ntau lub tuam txhab hauv Xiamen, Guangdong thiab lwm lub xeev thiab lub nroog tau kov yeej cov kev tsim cov fwj ntawm cov nqi qis loj ntawm kev npaj graphene, siv cov txheej txheem stripping tshuab rau industrially tsim graphene nrog tus nqi qis thiab zoo.
2. Txoj kev Redox
Oxidation-txo txoj kev yog oxidize ntuj graphite los ntawm kev siv tshuaj reagents xws li sulfuric acid thiab nitric acid thiab oxidants xws li poov tshuaj permanganate thiab hydrogen peroxide, ua rau kom qhov sib nrug ntawm graphite txheej, thiab ntxig oxides ntawm graphite txheej los npaj GraphiteOxide. Tom qab ntawd, cov reactant yog ntxuav nrog dej, thiab cov khoom ntxuav yog qhuav ntawm qhov kub thiab txias los npaj graphite oxide hmoov. Graphene oxide tau npaj los ntawm tev tawm graphite oxide hmoov los ntawm lub cev tev thiab kub nthuav dav. Thaum kawg, graphene oxide raug txo los ntawm cov txheej txheem tshuaj kom tau graphene (RGO). Txoj kev no yooj yim rau kev khiav lag luam, nrog cov txiaj ntsig siab, tab sis cov khoom tsis zoo [13]. Oxidation-txo txoj kev siv cov kua qaub uas muaj zog xws li sulfuric acid thiab nitric acid, uas yog qhov txaus ntshai thiab yuav tsum tau siv dej ntau rau kev ntxuav, uas ua rau muaj kuab paug ib puag ncig zoo.
Graphene npaj los ntawm txoj kev redox muaj cov nplua nuj oxygen-muaj cov pab pawg ua haujlwm thiab yooj yim hloov kho. Txawm li cas los xij, thaum txo graphene oxide, nws tsis yooj yim los tswj cov pa oxygen ntawm graphene tom qab txo qis, thiab graphene oxide yuav raug txo kom tsis tu ncua nyob rau hauv lub hnub, kub kub hauv lub tsheb thauj mus los thiab lwm yam, yog li cov khoom zoo ntawm graphene. tsim los ntawm txoj kev redox feem ntau tsis sib haum los ntawm batch mus rau batch, uas ua rau nws nyuaj rau tswj qhov zoo.
Tam sim no, ntau tus neeg tsis meej pem cov ntsiab lus ntawm graphite oxide, graphene oxide thiab txo graphene oxide. Graphite oxide yog xim av thiab yog polymer ntawm graphite thiab oxide. Graphene oxide yog ib yam khoom tau los ntawm tev graphite oxide rau ib txheej, ob txheej los yog oligo txheej, thiab muaj cov pa ntau ntawm cov pab pawg, yog li graphene oxide tsis yog-conductive thiab muaj zog, uas yuav txo qis. thiab tso cov pa roj xws li sulfur dioxide thaum siv, tshwj xeeb tshaj yog thaum ua cov khoom kub kub. Cov khoom tom qab txo graphene oxide tuaj yeem hu ua graphene (txo graphene oxide).
3. (silicon carbide) SiC epitaxial txoj kev
SiC epitaxial txoj kev yog kom sublimate silicon atoms deb ntawm cov ntaub ntawv thiab reconstruct lub seem C atoms los ntawm nws tus kheej-assembly nyob rau hauv ultra-high nqus thiab kub ib puag ncig, yog li tau txais graphene raws li SiC substrate. High-zoo graphene tuaj yeem tau txais los ntawm txoj kev no, tab sis txoj kev no yuav tsum muaj cov khoom siv siab dua.
Post lub sij hawm: Jan-25-2021