Txias cov hluav taws xob muaj zog hauv cov xov tooj smartphones tshiab tuaj yeem yog qhov kev sib tw loj. Cov kws tshawb fawb ntawm King Abdullah University of Science thiab Technology tau tsim txoj hauv kev sai thiab muaj txiaj ntsig los tsim cov khoom siv carbon zoo tagnrho rau dissipating tshav kub los 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 hnub ci vaj huam sib luag.
Ntau cov khoom siv hluav taws xob siv graphite films los ua thiab dissipate cov cua sov uas tsim los ntawm cov khoom siv hluav taws xob. Txawm hais tias graphite yog ib daim ntawv ntawm cov pa roj carbon monoxide, kev tswj xyuas thermal hauv hluav taws xob yog ib daim ntawv thov thiab feem ntau nyob ntawm kev siv cov yeeb yaj kiab zoo micron-tuab graphite. "Txawm li cas los xij, cov txheej txheem ntawm kev ua cov graphite films siv polymers li raw cov ntaub ntawv yog complex thiab zog-intensive," piav qhia Gitanjali Deokar, postdoc nyob rau hauv Pedro Costa lub chaw kuaj mob uas ua hauj lwm. Cov yeeb yaj kiab yog tsim los ntawm ntau cov txheej txheem uas yuav tsum tau kub txog 3,200 degrees Celsius thiab tsis tuaj yeem tsim cov yeeb yaj kiab thinner dua li ob peb microns.
Deokar, Costa thiab lawv cov npoj yaig tau tsim txoj hauv kev nrawm thiab siv zog ua cov ntawv graphite txog 100 nanometers tuab. Pab neeg siv cov txheej txheem hu ua chemical vapor deposition (CVD) kom loj hlob nanometer-thick graphite films (NGFs) ntawm cov ntawv nyiaj npib tsib xee, qhov twg cov npib tsib xee catalyzes hloov ntawm kub methane rau hauv graphite ntawm nws qhov chaw. "Peb tau ua tiav NGF hauv tsuas yog 5-feeb CVD theem kev loj hlob ntawm qhov ntsuas kub ntawm 900 degrees Celsius," Deokar tau hais.
NGF tuaj yeem loj hlob mus rau hauv nplooj ntawv mus txog 55 cm2 hauv cheeb tsam thiab loj hlob ntawm ob sab ntawm cov ntawv ci. Nws tuaj yeem raug tshem tawm thiab xa mus rau lwm qhov chaw yam tsis tas yuav tsum muaj txheej txheej txheej txheej polymer, uas yog qhov yuav tsum tau ua thaum ua haujlwm nrog ib txheej graphene films.
Ua haujlwm nrog tus kws tshaj lij electron microscopy Alessandro Genovese, pab pawg tau txais kev sib kis ntawm electron microscopy (TEM) dluab ntawm ntu ntu ntawm NGF ntawm nickel. "Kev soj ntsuam qhov sib cuam tshuam ntawm graphite films thiab nickel foil yog qhov ua tiav tsis tau pom dua thiab yuav muab kev nkag siab ntxiv rau txoj kev loj hlob ntawm cov yeeb yaj kiab no," Costa hais.
Lub thickness ntawm NGF ntog ntawm kev lag luam muaj micron-thick graphite films thiab ib txheej graphene. Costa tau hais tias "NGF ntxiv cov graphene thiab cov ntawv graphite, ntxiv rau cov arsenal ntawm cov pa roj carbon monoxide," Costa hais. Piv txwv li, vim nws qhov kev hloov pauv tau yooj yim, NGF tuaj yeem siv rau kev tswj xyuas thermal hauv cov xov tooj hloov tau yooj yim uas tam sim no pib tshwm sim hauv khw. "Piv nrog graphene films, 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 kev siv tshaj li qhov cua sov dissipation. Ib qho kev nthuav qhia tshwj xeeb hauv TEM cov duab yog tias qee qhov ntawm NGF tsuas yog ob peb txheej ntawm carbon tuab. Deoka tau hais tias "Qhov zoo tshaj plaws, muaj ntau txheej txheej ntawm graphene domains ua kom muaj qhov pom tseeb pom pom pom pom thoob plaws hauv zaj duab xis," Deoka hais. Pab pawg tshawb fawb pom tau tias cov khoom siv hluav taws xob, translucent NGF tuaj yeem siv los ua ib feem ntawm lub hnub ci hlwb lossis ua cov khoom siv los ntsuas cov pa nitrogen dioxide. Costa tau hais tias "Peb npaj yuav koom ua ke NGF rau hauv cov khoom siv kom nws tuaj yeem ua raws li cov khoom siv ua haujlwm ntau," Costa hais.
Cov ntaub ntawv ntxiv: Gitanjali Deokar et al., Kev loj hlob sai ntawm nanometer-thick graphite films ntawm wafer-scale nickel ntawv ci thiab lawv cov qauv kev tsom xam, Nanotechnology (2020). DOI: 10.1088/1361-6528/aba712
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Post lub sij hawm: Sep-05-2024