Amashidi e-graphite asiza ama-smartphone esizukulwane esisha ukuthi ahlale epholile

Ukupholisa ama-electronics anamandla kuma-smartphone akamuva kungaba inselele enkulu. Abacwaningi e-King Abdullah University of Science and Technology baye bahlakulela indlela esheshayo nephumelelayo yokwakha izinto zekhabhoni ezilungele ukuqeda ukushisa okuvela kumishini kagesi. Lokhu okubalulekile okuguquguqukayo kungathola ezinye izinhlelo zokusebenza, kusukela kuzinzwa zegesi kuya kumaphaneli elanga.
Imishini eminingi ye-elekthronikhi isebenzisa amafilimu e-graphite ukuze iqhube futhi ikhiphe ukushisa okukhiqizwa izingxenye ze-elekthronikhi. Nakuba i-graphite iwuhlobo lwemvelo lwekhabhoni, ukuphathwa kwe-thermal ku-electronics kuwuhlelo olunzima futhi ngokuvamile luncike ekusetshenzisweni kwamafilimu ekhwalithi ephezulu ye-micron-thick graphite. “Nokho, indlela yokwenza lawa mafilimu e-graphite kusetshenziswa ama-polymer njengezinto ezingavuthiwe iyinkimbinkimbi futhi idla amandla,” kuchaza uGitanjali Deokar, i-postdoc elebhu kaPedro Costa owayehola umsebenzi. Amafilimu enziwa ngenqubo yezinyathelo eziningi edinga izinga lokushisa elifinyelela ku-3,200 degrees Celsius futhi ayikwazi ukukhiqiza amafilimu amancanyana kunama-microns ambalwa.
U-Deokar, u-Costa kanye nozakwabo benze indlela esheshayo neyonga amandla yokwenza amashidi e-graphite awugqinsi wama-nanometer angu-100. Ithimba lasebenzisa indlela ebizwa ngokuthi i-chemical vapor deposition (CVD) ukuze kukhule amafilimu e-nanometer-thick graphite films (NGFs) ku-nickel foil, lapho i-nickel igqugquzela ukuguqulwa kwe-methane eshisayo ibe yigraphite endaweni yayo. "Sithole i-NGF ngesinyathelo sokukhula se-CVD semizuzu engu-5 ekushiseni okusabela kwe-900 degrees Celsius," kusho u-Deokar.
I-NGF ingakhula ibe amashidi afinyelela ku-55 cm2 endaweni futhi ikhule ezinhlangothini zombili ze-foil. Ingasuswa futhi idluliselwe kwezinye izindawo ngaphandle kwesidingo sesendlalelo sokusekela se-polymer, okuyisidingo esivamile lapho usebenza namafilimu e-graphene yongqimba olulodwa.
Ngokusebenzisana nochwepheshe we-electron microscopy u-Alessandro Genovese, ithimba lithole izithombe ze-transmission electron microscopy (TEM) zezingxenye ezihlukene ze-NGF ku-nickel. "Ukubuka ukuxhumana phakathi kwamafilimu e-graphite ne-nickel foil kuyimpumelelo engakaze ibonwe futhi kuzohlinzeka ngemininingwane eyengeziwe endleleni yokukhula kwalawa mafilimu," kusho u-Costa.
Ugqinsi lwe-NGF luwela phakathi kwamafilimu e-graphite ama-micron-thick and single-layer graphene. "I-NGF igcwalisa i-graphene namashidi e-graphite yezimboni, engeza ku-arsenal yamafilimu e-carbon layered," kusho u-Costa. Isibonelo, ngenxa yokuguquguquka kwayo, i-NGF ingasetshenziselwa ukuphatha okushisayo kumaselula aguquguqukayo manje aqala ukubonakala emakethe. "Uma kuqhathaniswa namafilimu e-graphene, ukuhlanganiswa kwe-NGF kuzoba ishibhile futhi kuzinzile," wanezela.
Kodwa-ke, i-NGF inokusebenzisa okuningi okungaphezu kokukhipha ukushisa. Isici esijabulisayo esigqanyiswe ezithombeni ze-TEM ukuthi ezinye izingxenye ze-NGF ziyizendlalelo ezimbalwa kuphela zekhabhoni ewugqinsi. "Ngokumangalisayo, ukuba khona kwezingqimba eziningi zezizinda ze-graphene kuqinisekisa izinga elanele lokubonakala obala kokukhanya kuyo yonke ifilimu," kusho uDeoka. Ithimba labacwaningi licabange ukuthi i-NGF eqhubayo, eguquguqukayo ingasetshenziswa njengengxenye yamaseli elanga noma njengento yokuzwa yokuthola igesi ye-nitrogen dioxide. "Sihlela ukuhlanganisa i-NGF kumadivayisi ukuze isebenze njengento esebenzayo esebenzayo," kusho uCosta.
Ulwazi olwengeziwe: U-Gitanjali Deokar et al., Ukukhula ngokushesha kwamafilimu e-nanometer-thick graphite ku-wafer-scale nickel foil kanye nokuhlaziywa kwawo kwesakhiwo, i-Nanotechnology (2020). I-DOI: 10.1088/1361-6528/aba712
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Isikhathi sokuthumela: Sep-05-2024