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Txheej txheem cej luam Ntawm Kev Npaj Ntawm Graphene

Tam sim no, muaj ntau txoj kev rau kev npaj graphene. Daim ntawv no tau muab faib ua lub cev thiab tshuaj kho.

1 lub cev txoj kev rau kev npaj graphene

Lub cev nqaij daim ntawv feem ntau yog siv los ntawm graphite pheej yig los yog nthuav graphite ua raw khoom, los ntawm cov khoom siv sib tw, kev ua pleev xim, kev ua kua los yog roj mus los ua ib txoj kev los npaj ib los yog ntau txheej txheem graphene. Cov hau kev no yooj yim kom tau cov ntaub ntawv raw, kev lag luam yog cov yooj yim, hluavtaws graphene siab purity, tsawg dua ntais.

1.1 hom kab xev thev hlau

Cov neeg ua haujlwm tawm los yog kev sib txuas lus micromachining yog ib qho nyuaj tshaj plaws uas ncaj qha mus tev tawm ib daim duab los ntawm cov tawv siv loj. Novoselovt li al. Ua tau zoo nyob rau hauv kev sib tw thiab kev soj ntsuam cov graphene monolayer los ntawm cov qauv ntse pyrolytic graphite nrog ib hom micromachined stripping txoj hauv 2004, ua rau muaj kev sib tw ntawm graphene monolayer. Cov txheej txheem tshwj xeeb yog raws li nram qab no: thawj zaug siv oxygen ntshav rau hauv 1 hli tuab heev ntse pyrolytic graphite deg ion etching, thaum lub qhov hluav taws kub etching 20 μm dav thiab 2 μm deep micro-slot, nrog photoresist yuav nws yog glued rau lub khob substrate, thiab tom qab ntawd rhuav daim kab xev yog pheej muab tshem tawm nrog daim kab xev, thiab tom qab ntawd ces qhov ntau dhau heev lawm pyrolytic graphite yog muab tshem tawm thiab iav substrate nrog cov microcapsules muab tso rau hauv cov acetone kua rau ultrasonic, thiab thaum kawg monocrystalline silicon wafer rau cov acetone hnyav, siv van der Waals quab yuam lossis capillary quab yuam yuav yog ib txheej txheej ntawm "tshem tawm".

Txawm li cas los xij, txoj kev no muaj qee qhov teeb meem, xws li qhov loj ntawm cov khoom tau los tsis yooj yim rau kev tswj hwm, tsis muaj peev xwm npaj tau ib qho graphene ntev, thiab yog li ntawd tsis tuaj yeem ua kom tau cov kev xav tau.

1.2 kev cob qhia epiphytic - txoj kev loj hlob ntawm txoj kev loj hlob

Peter W.Sutter li al. Siv tsawg hlau ruthenium raws li txoj kev loj hlob hauv kev loj hlob, siv cov qauv atomic ntawm qhov "hom" ntawm graphene. Cov kab A C yog thawj infiltrated rau hauv ruthenium ntawm 1150 ° C thiab tom qab ntawd txias rau 850 ° C. Ua ntej cov roj carbon atoms loj heev, lawv ntab mus rau ntawm lub ruthenium, sib sau ua ke cov kab cim roj carbon atom "island" rau ntawm qhov chaw Tom qab thawj txheej txheem nqi ntawm 80%, qhov txheej thib ob pib loj hlob, hauv qab ntawm lub graphene thiab hauv matrix muaj kev sib raug zoo ntawm kev sib koom tes ntawm lub substrate, Island " qhov txheej txheem thib ob tom qab tsim cov txheej txheem qub thiab cov substrate yog yuav luag tag nrho, tawm tsuas yog tsis sib zog ua haujlwm, Yog li, daim duab graphite monolithic tau npaj tseg. adhesion ntawm graphene thiab hauv matrix cuam tshuam cov khoom ntawm lub graphene flakes npaj.

1.3 Cov dej ua kua thiab cov roj theem ncaj qha rau txoj kab

Cov dej ua kua thiab cov nplaum ncaj qha stripping hais txog kev tso tawm ncaj qha graphite lossis nthuav cov graphite (EG) (feem ntau ntawm kub kub nce txog 1000 ° C saum npoo ntawm cov pa uas muaj oxygen uas tau muab tshem tawm) ntxiv rau cov organic solvent lossis dej, nrog ultrasound, Cua kub los yog cua ntws los tsim ib co concentration ntawm ib qho los yog ntau txheej txheej graphene. Coleman li al. Dispersed graphite nyob rau hauv N-methyl-pyrrolidone (NMP) tib yam li kua-theem peeling ntawm carbon nanotubes. Cov paib ntawm monolayer graphene yog 1% tom qab 1 teev ntawm ultrasound, thiab ntev ultrasound (462 h) Yog li ntawd cov graphene concentration txog li 1.2 mg / mL. Cov kev tshwm sim qhia tau hais tias qhov sib cuam tshuam ntawm qhov hnyav thiab lub graphene tuaj yeem sib npaug lub zog uas yuav tsum tau tev tawm cov graphene thaum qhov hnyav sib npaug zog ntawm lub graphene, thiab qhov nro ntawm lub graphene tau 40 ~ 50mJ / M2. Cov nyom ntawm stripping graphite daim ntawv tuaj yeem paub tau los ntawm kev cuam tshuam ntawm airflow. Janowska li al. Siv cov graphite ntxiv ua raw khoom thiab microwave irradiation los txhim kho tagnrho tawm ntawm graphene (~ 8%) nrog ammonia ua hnyav. Cov kev tshawb fawb qhia tau tias ammonia uas ua los ntawm cov tshuaj tsis haum ntawm kev kub ntxhov tuaj yeem nkag mus rau ntawm daim ntawv graphite thiab tev tawm ntawm graphite thaum cua tshuab siab tshaj ib qho nqi txaus los tiv thaiv cov van der Waals quab yuam ntawm cov ntawv txheeb.

Vim yog cov graphite uas pheej yig los sis nthuav graphite ua raw khoom, txoj kev npaj yuav tsis muaj kev hloov tshuaj. Kev tsim cov graphene los ntawm cov kua ua kua lossis cov roj theem ncaj qha cov cuab yeej muaj qhov zoo ntawm cov nqi qis, cov lag luam yooj yim thiab cov khoom zoo, tab sis kuj tseem muaj graphite yields ntawm cov yas siab, qhov kev lag luam loj loj, yuav tsum tau tshem tawm cov stabilizer thiab lwm yam teeb meem.


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