Cov kws tshawb fawb tau tshawb pom tias vim li cas graphene oxide tsis tsuas yog kub hnyiab ntawm qhov kub, tab sis qhib qhov rooj rau txoj kev pheej yig thiab pheej yig ntawm kev tsim graphene. Kev tshawb fawb yog nyob rau hauv phau ntawv Journal Carbon.
Nws tau ntau tshaj li kaum xyoo txij li Nobel nqi zog tau txais txiaj ntsig rau kev sim tshawb fawb ntawm graphene, tab sis cov kws tshawb fawb tseem tsis tau pom txoj hauv kev kom tau txais cov khoom zoo, thaj chaw loj graphene uas yuav pheej yig, muaj txiaj ntsig, thiab muaj peev xwm txaus kom tau raws li kev lag luam. xav tau. Kev txo qis ntawm graphene los ntawm graphene oxide los ntawm laser irradiation zoo nkaus li yog ib txoj hauv kev zoo: Los ntawm kev siv tshuaj los npaj graphene oxide los ntawm cov graphite zoo tib yam, laser-pab txo cov tshuab tuav cov lus cog tseg zoo ntawm cov nqi thiab cov khoom siv zoo.
Ob peb xyoos dhau los, ib pab neeg tshawb fawb los ntawm Skoltech tau tshawb pom tias graphene oxide tuaj yeem ua kom sov rau 3300-3800 K, txawm tias nyob hauv huab cua, los tsim cov graphene ntawm cov khoom zoo.
Nikita Orekhov tau hais tias: "Qhov tshwm sim no ua rau peb cov npoj yaig xav tsis thoob: qhov kub thiab txias heev, tab sis lawv tau txais cov khoom siv zoo. Cov ntaub ntawv carbon hlawv yooj yim hauv huab cua oxygen ntawm 600-800 K lossis siab dua, thaum nyob hauv kev sim ntawm qhov kub siab dua, graphene ua tiav cov qauv zoo. " Nikita Orekhov, tus thawj coj ntawm MIT's Condensed Matter Physics Supercomputer Methods Laboratory, tau hais tias, "Yuav kom nrhiav tau qhov ua rau ntawm qhov kev xav tsis zoo no, peb txiav txim siab los kawm txog cov txheej txheem txo cov kub kub graphene oxide siv supercomputer atomic qauv thiab ua ntxiv. kev tshawb fawb tom qab kev sim tsim ntawm peb cov npoj yaig. "
Nyob rau hauv qhov kev txiav txim ntawm lub laser mem tes, cov xim liab-cim carbon atoms ntawm ciam teb ntawm daim ntawv graphene "kub tawm." B - Nyob rau hauv nruab nrab cheeb tsam ntawm daim ntawv graphene, annealing tshwm sim: lub graphene yog teem nyob rau hauv qhov tseeb ruaj khov qauv.
Cov kws tshawb nrhiav pom tias, ntawm ib sab, ntawm qhov kub siab (T> 3000k) oxygen atoms hauv cov pa roj ib puag ncig cuam tshuam nrog graphene, oxidizing thiab rhuav tshem nws. Ntawm qhov tod tes, qhov nrawm nrawm ntawm cov siv lead ua lattice pib ntawm qhov kub thiab txias, uas tso cai rau kev tshem tawm qhov tsis xws luag. Thaum lub sij hawm annealing, lub lattice qauv straightens es tsis txhob disintegrates.
Qhov kub thiab txias thiab I (G) / I (D) piv nkhaus ntawm rGO array txo qis ntawm qhov sib txawv laser speeds thiab pulse repetition tus nqi.
"Nws hloov tawm hais tias ob txoj kev tawm tsam tshwm sim ib txhij ntawm qhov chaw sib txawv ntawm cov khoom raug rau lub laser pulses: combustion los yog kev puas tsuaj yog concentrated nyob ze ntawm qhov tsis xws luag thiab ciam teb ntawm daim ntawv graphene, qhov twg cov pa roj carbon atoms muaj cov tshuaj lom neeg ua haujlwm tshaj plaws, thaum annealing. tshwm sim feem ntau nyob rau hauv nruab nrab ntawm cov nplooj ntawv, qhov twg cov atoms yuav rov qab mus rau ib tug ruaj khov configuration. " Stanislav Evlashin, Tus Thawj Saib Xyuas Kev Tshawb Fawb ntawm Skoltech's Center for Materials Technology (CMT).
Cov kev tshawb pom pom tau pom tias yuav ua li cas graphene oxide coj ntawm qhov kub thiab txias, qhov kev sim ncaj qha yuav luag tsis yooj yim sua. Kev nkag siab txog cov txheej txheem uas tau piav qhia hauv daim ntawv no tuaj yeem pab txhim kho ntxiv thiab txhim kho txoj hauv kev kom tau txais thaj tsam loj ib leeg siv lead ua zoo graphene.
Atomic structure (a) thiab thermal state scheme (b) of GO. Lub sij hawm evolution ntawm tag nrho cov atomic tooj (c), carbon atomic tooj (d) thiab oxygen atomic tooj (e) thaum lub simulation ntawm txawv kub. Cov atoms ntawm carbon, oxygen, thiab hydrogen yog qhia nyob rau hauv xiav, liab, thiab grey, feem.
Source: Mechanism ntawm graphene oxide laser txo ntawm ambient tej yam kev mob: Kev sim thiab ReaxFF kawm, Carbon (2022). DOI: 10.1016/j.carbon.2022.02.018;Controlable LaserReduction of Graphene Oxide Films for Photoelectronic Applications, ACSApplied Materials & Interfaces (2016). DOI: 10.1021/acsami.6b10145