Absorb ntau dua 90 feem pua ​​​​ntawm hnub ci! Australia tsim hom tshiab graphene zaj duab xis!

Cov kws tshawb fawb ntawm Center for Translational Atomaterials (CTAM) ntawm Swinburne University of Technology hauv Melbourne, Australia tau tsim ib zaj duab xis graphene tshiab uas tuaj yeem nqus tau ntau dua 90 feem pua ​​​​ntawm tshav ntuj thaum tib lub sijhawm feem ntau ntawm cov hluav taws xob thermal emission poob raug tshem tawm, thiab qhov no yog qhov thawj tsab ntawv ceeb toom ntawm no feat.

Qhov no yog cov khoom siv hluav taws xob ua hluav taws xob muaj txiaj ntsig zoo uas muaj peev xwm ua kom sov sai rau 83 degrees Celsius (181 degrees Fahrenheit) hauv qhov chaw qhib nrog qhov kub tsawg. Cov ntawv thov rau zaj duab xis muaj xws li thermal zog sau thiab khaws cia, hnub ci thermal zog tsim, thiab seawater desalination.

CTAM Founding Director Prof. Baohua Jia tau hais tias thaum nqus lub hnub ci thaum tiv thaiv thermal tawg (tseem hu ua blackbody radiation) yog qhov tseem ceeb rau cov hnub ci thermal absorbers, nws nyuaj heev kom ua tiav. "Qhov no yog vim hais tias, nyob ntawm seb lub tshav kub absorbed thiab cov khoom ntawm lub absorber, lub emission kub txawv heev, uas ua rau ib tug tseem ceeb sib txawv nyob rau hauv nws wavelength," nws piav qhia. Tab sis peb tau tsim peb-seem qauv graphene metamaterial (structured graphene meta cov ntaub ntawv, SGM), uas yog absorbed heev thiab muaj peev xwm xaiv lim tawm blackbody hluav taws xob. "

Qhov no peb-dimensionally structured graphene metamaterial muaj ib tug 30-nanometer-thick alternating graphene zaj duab xis thiab ib tug dielectric txheej tso rau ntawm ib tug trench-zoo li nanostructure uas doubles raws li ib tug tooj liab substrate rau enhanced haum. Qhov tseem ceeb tshaj, cov substrates yog cov qauv hauv kev teeb tsa matrix los ua kom yooj yim tunability ntawm wavelength selective absorption.

Cov graphene films yog tsim los nqus lub teeb ntawm wavelengths ntawm 0.28 thiab 2.5 microns. Cov qauv ntawm tooj liab substrate tso cai rau nws ua raws li ib tug xaiv bandpass lim, suppressing lub cev emission ntawm internally generated blackbody zog. Cov cua sov uas khaws cia no tuaj yeem ua rau qhov kub thiab txias ntawm metamaterial. Yog li, SGM tuaj yeem ua kom sov txog 83 degrees Celsius sai sai. Yog tias qhov ntsuas kub sib txawv yuav tsum tau siv rau cov ntawv thov tshwj xeeb, cov channel nanostructures tshiab tuaj yeem tsim thiab kho kom haum rau qhov tshwj xeeb blackbody wavelengths. "Nyob rau hauv peb txoj haujlwm dhau los, peb tau ua qauv qhia txog 90-nanometer graphene endothermic khoom," said xibfwb Jia. Txawm hais tias nws tuaj yeem ua kom sov rau 160 degrees Celsius, "nws cov qauv yog qhov nyuaj dua, muaj plaub txheej: ib txheej txheej, txheej nyiaj, txheej silicon oxide, thiab txheej graphene. Peb cov qauv bilayer tshiab yog yooj yim dua thiab tsis tas yuav nqus tsev Txoj kev tsim khoom Scalable thiab tus nqi qis."

Cov khoom siv tshiab kuj tseem txo cov zaj duab xis tuab los ntawm ib feem peb thiab siv cov graphene tsawg dua, thiab nws cov thinness pab hloov cov cua sov mus rau lwm cov xov xwm, xws li dej, zoo dua. Tsis tas li ntawd, cov yeeb yaj kiab yog hydrophobic, uas pab tu tus kheej, thaum lub graphene txheej zoo tiv thaiv txheej tooj liab los ntawm corrosion, pab kom ntev lub neej ntawm metamaterial.

"Vim tias cov txheej txheem tsis zoo ntawm cov hlau substrate yog qhov tseem ceeb ntawm kev tswj tag nrho cov kev nqus nqus ntawm SGM, ntau dua li nws cov khoom siv, cov hlau sib txawv tuaj yeem siv tau raws li daim ntawv thov xav tau lossis nqi," said Keng-Te Lin, uas nyuam qhuav hais. luam tawm nyob rau hauv Nature Communications (Nature Communications), tus thawj coj ntawm ib daim ntawv ntawm metamaterials thiab ib tug kws tshawb fawb ntawm Swinburne University. Nws tau sau tseg tias aluminium ntawv ci kuj tuaj yeem siv los hloov tooj liab yam tsis muaj kev cuam tshuam kev ua haujlwm.

Keng-Te tau hais tias: "Peb tau siv cov qauv txheej txheem los tsim cov dej huv thiab ua tiav lub hnub ci ua haujlwm zoo ntawm 96.2 feem pua. Qhov no yog qhov sib tw heev rau cov dej huv tsim hluav taws xob siv cov khoom siv hluav taws xob txuas ntxiv.

Nws hais ntxiv tias cov khoom siv hluav taws xob kuj tseem tuaj yeem siv rau hauv kev sau hluav taws xob thiab kev hloov pauv kev siv hluav taws xob, hluav taws xob tsim hluav taws xob, kev lim dej pov tseg, dej hiav txwv desalination thiab hnub ci thermal tsim hluav taws xob.

Tab sis ib qho kev sib tw uas tseem tshuav yog nrhiav txoj hauv kev los ua kom lub substrate stretchable.

"Peb tab tom ua haujlwm nrog Innofocus Photonics Technology, ib lub tuam txhab ntiag tug uas tau ua lag luam ib txheej tshuab rau nteg graphene thiab dielectric txheej," said xibfwb Jia. "Peb zoo siab nrog qhov ntawd. Tam sim no peb tab tom nrhiav txoj hauv kev los tsim cov tooj liab substrates ntawm nplai." Ib txoj hauv kev ua tau, nws ntxiv, yog txheej txheem yob-rau-yob.

Lub caij no, cov kws tshawb fawb txuas ntxiv txhim kho tus qauv nanostructure los txhim kho qhov ruaj khov thiab nqus tau zoo ntawm SGM. "Raws li kev lag luam," Xib Fwb Jia tau hais tias, "peb xav tias nws tuaj yeem ua tau hauv ib mus rau ob xyoos."