Graphene Ntau Lawm Txheej Txheem

1, mechanical stripping method
Mechanical stripping qauv yog txoj kev los txais graphene nyias-txheej cov ntaub ntawv los ntawm kev siv txoj kev sib txhuam thiab kev sib txheeb ntawm cov khoom thiab graphene. Cov txheej txheem yog yooj yim rau kev khiav lag luam, thiab tau txais graphene feem ntau ua kom tiav cov qauv siv lead ua tiav. Nyob rau xyoo 2004, ob tus kws tshawb fawb Askiv tau siv cov nplais pob tshab rau tev tawm ntawm txheej ntuj graphite txheej los ntawm txheej kom tau txais cov graphene, uas tseem tau muab cais ua cov txheej txheem ntawm cov neeg kho tshuab. Hom no ib zaug tau pom tias yog qhov ua tsis tau zoo thiab tsis tuaj yeem ua ntau lawm.
Xyoo tsis ntev los no, kev lag luam muaj ntau qhov kev tshawb fawb thiab kev tsim kho tshiab hauv kev tsim cov qauv graphene. Tam sim no, ntau lub tuam txhab nyob hauv Xiamen, Guangdong thiab lwm lub xeev thiab cov nroog tau kov yeej cov kev lag luam ntau lawm ntawm cov khoom lag luam uas tsis tshua muaj nqi loj ntawm kev npaj graphene, siv cov khoom siv tshuab tshem tawm cov txheej txheem rau kev tsim khoom lag luam graphene nrog tus nqi qis thiab zoo.

2. Redox txoj kev
Oxidation-txo txoj kev yog rau oxidize ntuj graphite los ntawm kev siv tshuaj lom neeg cov tshuaj xws li sulfuric acid thiab nitric acid thiab oxidants xws li potassium permanganate thiab hydrogen peroxide, nce qhov sib nrug ntawm graphite txheej, thiab ntxig oxide ntawm graphite txheej los npaj GraphiteOxide. Tom qab ntawd, cov tshuaj tiv thaiv kab mob tau ntxuav nrog dej, thiab cov khoom ntxuav tau qhuav ntawm qhov kub tsawg los npaj graphite oxide hmoov. Graphene oxide tau npaj los ntawm tev graphite oxide hmoov los ntawm kev tawm ntawm lub cev thiab qhov kub thiab nthuav tawm ntxiv. Thaum kawg, graphene oxide tau raug txo los ntawm kev siv tshuaj lom neeg kom tau txais graphene (RGO). Txoj kev no yooj yim rau kev khiav lag luam, nrog siab ntau, tab sis cov khoom lag luam qis [13]. Oxidation-txo txoj kev siv cov muaj zog acids xws li sulfuric acid thiab nitric acid, uas yog txaus ntshai thiab yuav tsum tau siv dej ntau rau kev tu, uas coj cov ib puag ncig muaj kuab paug.

Graphene npaj los ntawm txoj kev redox muaj cov pa oxygen uas muaj cov pab pawg ua haujlwm zoo thiab nws yooj yim los hloov. Txawm li cas los xij, thaum txo qis graphene oxide, nws yog qhov nyuaj rau kev tswj cov pa oxygen ntawm graphene tom qab txo, thiab graphene oxide yuav tsis tu ncua nyob rau hauv kev cuam tshuam ntawm lub hnub, kub nyob rau hauv lub tsheb thiab lwm yam sab nraud, yog li qhov zoo ntawm cov khoom lag luam graphene tsim los ntawm txoj kev rov ua dua tshiab feem ntau tsis sib xws los ntawm ib pob mus rau ib pob, uas ua rau nws nyuaj los tswj cov khoom zoo.
Tam sim no, ntau tus neeg tsis meej pem lub tswv yim ntawm graphite oxide, graphene oxide thiab txo graphene oxide. Graphite oxide yog xim av thiab yog ib qho polymer ntawm graphite thiab oxide. Graphene oxide yog ib yam khoom tau los ntawm tev graphite oxide rau ib txheej, ob txheej los yog txheej txheej oligo, thiab muaj cov pawg ntau ntawm cov pa oxygen, yog li graphene oxide tsis yog kev coj ua thiab muaj cov khoom ua haujlwm, uas yuav txo qis txuas ntxiv thiab tso cov roj cua xws li cov leej faj sulfur thaum siv, tshwj xeeb tshaj yog thaum ua cov khoom siv ntsuas kub. Cov khoom lag luam tom qab txo cov graphene oxide tuaj yeem hu ua graphene (txo graphene oxide).

3. (silicon carbide) SiC txoj kev epitaxial
SiC epitaxial txoj kev yog los sublimate silicon atoms kom deb ntawm cov ntaub ntawv thiab rov tsim dua C atoms los ntawm tus kheej los ua ke hauv ultra-siab nqus thiab siab kub ib puag ncig, yog li tau txais graphene raws li SiC substrate. Zoo graphene tuaj yeem tau txais los ntawm hom no, tab sis hom no yuav tsum muaj cov khoom siab dua.


Sijhawm Sijhawm: Jan-25-2021