Kev ua kom cov khoom siv hluav taws xob muaj zog hauv cov xov tooj ntse tshiab kawg tuaj yeem yog qhov nyuaj heev. Cov kws tshawb fawb ntawm King Abdullah University of Science and Technology tau tsim ib txoj hauv kev ceev thiab ua tau zoo rau kev tsim cov khoom siv carbon zoo tagnrho rau kev tshem tawm cua sov ntawm cov khoom siv hluav taws xob. Cov khoom siv ntau yam no tuaj yeem nrhiav tau lwm yam kev siv, los ntawm cov roj sensors mus rau cov vaj huam sib luag hnub ci.
Muaj ntau yam khoom siv hluav taws xob siv cov yeeb yaj kiab graphite los coj thiab tshem tawm cov cua sov uas tsim los ntawm cov khoom siv hluav taws xob. Txawm hais tias graphite yog ib hom carbon ntuj, kev tswj cua sov hauv cov khoom siv hluav taws xob yog ib daim ntawv thov uas nyuaj thiab feem ntau nyob ntawm kev siv cov yeeb yaj kiab graphite zoo micron-tuab. "Txawm li cas los xij, txoj kev ua cov yeeb yaj kiab graphite no siv cov polymers ua cov khoom siv raw yog qhov nyuaj thiab siv zog ntau," piav qhia Gitanjali Deokar, tus kws tshawb fawb postdoc hauv Pedro Costa lub chaw kuaj mob uas tau coj txoj haujlwm. Cov yeeb yaj kiab tau ua los ntawm ntau kauj ruam uas xav tau qhov kub txog li 3,200 degrees Celsius thiab tsis tuaj yeem tsim cov yeeb yaj kiab nyias dua ob peb microns.
Deokar, Costa thiab lawv cov npoj yaig tau tsim ib txoj kev ua cov ntawv graphite uas tuab li 100 nanometers sai thiab siv hluav taws xob tsawg. Pab neeg tau siv ib txoj kev hu ua chemical vapor deposition (CVD) los cog cov zaj duab xis graphite tuab (NGFs) uas tuab li nanometer rau ntawm cov ntawv nickel, qhov twg cov nickel ua rau cov methane kub hloov mus ua graphite rau ntawm nws qhov chaw. "Peb tau txais NGF hauv 5 feeb xwb ntawm CVD kev loj hlob ntawm qhov kub ntawm 900 degrees Celsius," Deokar hais.
NGF tuaj yeem loj hlob mus ua daim ntawv txog li 55 cm2 hauv cheeb tsam thiab loj hlob ntawm ob sab ntawm daim ntawv ci. Nws tuaj yeem raug tshem tawm thiab hloov mus rau lwm qhov chaw yam tsis tas yuav muaj txheej polymer txhawb nqa, uas yog qhov yuav tsum tau ua thaum ua haujlwm nrog cov yeeb yaj kiab graphene ib txheej.
Ua haujlwm nrog tus kws tshaj lij electron microscopy Alessandro Genovese, pab pawg tau txais cov duab transmission electron microscopy (TEM) ntawm cov ntu hla ntawm NGF ntawm nickel. "Kev soj ntsuam qhov sib txuas ntawm cov yeeb yaj kiab graphite thiab nickel foil yog qhov ua tiav tsis tau muaj dua thiab yuav muab kev nkag siab ntxiv rau hauv txoj hauv kev loj hlob ntawm cov yeeb yaj kiab no," Costa hais.
Qhov tuab ntawm NGF poob ntawm cov yeeb yaj kiab graphite uas muaj nyob hauv khw thiab cov graphene ib txheej. "NGF ua kom tiav cov ntawv graphene thiab cov ntawv graphite hauv kev lag luam, ntxiv rau cov yeeb yaj kiab carbon uas muaj txheej," Costa hais. Piv txwv li, vim nws qhov yooj ywm, NGF tuaj yeem siv rau kev tswj cua sov hauv cov xov tooj ntawm tes uas yooj ywm uas tam sim no pib tshwm sim hauv khw. "Piv nrog cov yeeb yaj kiab graphene, kev koom ua ke ntawm NGF yuav pheej yig dua thiab ruaj khov dua," nws hais ntxiv.
Txawm li cas los xij, NGF muaj ntau yam siv dhau ntawm kev tshem tawm cua sov. Ib qho tshwj xeeb uas tau hais tawm hauv cov duab TEM yog tias qee qhov ntawm NGF tsuas yog ob peb txheej ntawm cov pa roj carbon tuab xwb. "Qhov zoo kawg nkaus, qhov muaj ntau txheej ntawm graphene domains ua kom muaj qib txaus ntawm kev pom lub teeb pom kev thoob plaws hauv zaj duab xis," Deoka hais. Pab pawg tshawb fawb tau xav tias cov conductive, translucent NGF tuaj yeem siv ua ib feem ntawm cov hlwb hnub ci lossis ua cov khoom siv rau kev ntes cov pa roj nitrogen dioxide. "Peb npaj yuav koom ua ke NGF rau hauv cov khoom siv kom nws tuaj yeem ua haujlwm ua cov khoom siv ntau yam," Costa hais.
Cov ntaub ntawv ntxiv: Gitanjali Deokar et al., Kev loj hlob sai ntawm cov yeeb yaj kiab graphite nanometer-tuab ntawm cov ntawv ci nickel wafer thiab lawv cov kev tshuaj xyuas cov qauv, Nanotechnology (2020). DOI: 10.1088/1361-6528/aba712
Yog tias koj ntsib teeb meem sau yuam kev, tsis raug, lossis xav xa daim ntawv thov kom hloov kho cov ntsiab lus ntawm nplooj ntawv no, thov siv daim foos no. Yog tias muaj lus nug dav dav, thov siv peb daim foos tiv tauj. Yog xav tau cov lus taw qhia dav dav, siv ntu lus tawm tswv yim rau pej xeem hauv qab no (ua raws li cov lus qhia).
Koj lub tswv yim tseem ceeb rau peb. Txawm li cas los xij, vim muaj ntau cov lus xa tuaj, peb tsis tuaj yeem lav tias yuav teb rau koj raws li koj xav tau.
Koj qhov chaw nyob email tsuas yog siv los qhia rau cov neeg tau txais uas yog tus xa email xwb. Koj qhov chaw nyob lossis tus neeg tau txais qhov chaw nyob yuav tsis raug siv rau lwm yam hom phiaj. Cov ntaub ntawv koj sau yuav tshwm sim hauv koj tus email thiab yuav tsis raug khaws cia los ntawm Phys.org hauv txhua daim ntawv.
Tau txais cov xov xwm tshiab txhua lub lim tiam thiab/lossis txhua hnub hauv koj lub inbox. Koj tuaj yeem tshem tawm koj cov ntaub ntawv txhua lub sijhawm thiab peb yuav tsis qhia koj cov ntaub ntawv rau cov neeg thib peb.
Peb ua kom peb cov ntsiab lus nkag tau rau txhua tus. Xav txog kev txhawb nqa Science X lub hom phiaj nrog tus account hwm.
Lub sijhawm tshaj tawm: Cuaj hlis-05-2024