Ukupholisa ii-elektroniki ezinamandla kwii-smartphones zamva nje kunokuba ngumngeni omkhulu. Abaphandi kwiYunivesithi yaseKing Abdullah yeSayensi kunye neTekhnoloji baye baphuhlisa indlela ekhawulezayo nesebenzayo yokudala izinto zekhabhoni ezifanelekileyo zokukhupha ukushisa kwizixhobo zombane. Esi sixhobo sisebenza ngeendlela ezininzi sinokufumana ezinye iinkqubo, ukusuka kwiinzwa zegesi ukuya kwiipaneli zelanga.
Izixhobo zombane ezininzi zisebenzisa iifilim zegraphite ukuze ziqhube kwaye zikhuphe ubushushu obuveliswa zizinto ze-elektroniki. Nangona igraphite iluhlobo lwendalo lwekhabhoni, ulawulo lwe-thermal kwi-electronics luyimfuneko kwaye luhlala luxhomekeke ekusetyenzisweni kweefilimu zegraphite ezikumgangatho ophezulu we-micron-thick. “Nangona kunjalo, indlela yokwenza ezi bhanyabhanya zegraphite kusetyenziswa iipolima njengezinto ezingasetyenziswanga intsonkothile kwaye ifuna amandla,” ucacisa uGitanjali Deokar, i-postdoc kwilebhu kaPedro Costa owayekhokela umsebenzi. Iifilimu zenziwe ngenkqubo yamanyathelo amaninzi efuna amaqondo okushisa ukuya kwi-3,200 degrees Celsius kwaye ayikwazi ukuvelisa iifilimu ezincinci kune-microns ezimbalwa.
UDeokar, iCosta kunye noogxa babo baye baphuhlisa indlela ekhawulezayo neyonga amandla okwenza amaphepha egraphite malunga ne-100 nanometers ubukhulu. Iqela lisebenzise ubuchule obubizwa ngokuba yi-chemical vapor deposition (CVD) ukukhulisa iifilimu ze-nanometer-thick graphite films (NGFs) kwi-nickel foil, apho nickel yenza ukuguqulwa kwemethane eshushu ibe yigraphite kumphezulu wayo. "Siphumelele i-NGF kwisinyathelo nje se-5-minute ye-CVD yokukhula kwiqondo lokushisa le-900 degrees Celsius," kusho uDeokar.
I-NGF inokukhula ibe ngamashiti ukuya kwi-55 cm2 kwindawo kwaye ikhule kumacala omabini efoyile. Inokususwa kwaye idluliselwe kwezinye iindawo ngaphandle kwesidingo soluhlu lwenkxaso ye-polymer, eyimfuno eqhelekileyo xa usebenza kunye neefilimu ze-graphene zodwa.
Ukusebenzisana nengcali ye-electron microscopy u-Alessandro Genovese, iqela lifumene imifanekiso yokuhanjiswa kwe-electron microscopy (TEM) ye-cross-sections ye-NGF kwi-nickel. "Ukuqwalasela unxibelelwano phakathi kweefilimu zegraphite kunye ne-nickel foil yimpumelelo engazange ibonwe ngaphambili kwaye iya kunika ulwazi olongezelelweyo kwindlela yokukhula kwezi filimu," utshilo uCosta.
Ubukhulu be-NGF buwela phakathi kweefilimu zegraphite ezifumanekayo kurhwebo kunye negraphene yomgangatho omnye. "I-NGF incedisa i-graphene kunye ne-industrial graphite sheets, eyongeza kwi-arsenal yeefilimu zekhabhoni," utshilo uCosta. Ngokomzekelo, ngenxa yokuguquguquka kwayo, i-NGF ingasetyenziselwa ulawulo lwe-thermal kwiifowuni eziguquguqukayo eziqala ukubonakala kwiimarike. "Xa kuthelekiswa namafilimu e-graphene, ukuhlanganiswa kwe-NGF kuya kuba kubiza kwaye kuzinzile," wongezelela.
Nangona kunjalo, i-NGF inosetyenziso oluninzi ngaphaya kokutshatyalaliswa kobushushu. Into enomdla ebonakaliswe kwimifanekiso ye-TEM kukuba ezinye iinxalenye ze-NGF ngamaleko ambalwa wekhabhoni engqindilili. "Ngokuphawulekayo, ubukho bemigangatho emininzi yemimandla yegraphene iqinisekisa iqondo elaneleyo lokubonakala kokukhanya okubonakalayo kuyo yonke ifilimu," kusho uDeoka. Iqela lophando liqikelele ukuba i-NGF eqhubayo, eguquguqukayo ingasetyenziselwa njengenxalenye yeeseli zelanga okanye njengento yokubona igesi ye-nitrogen dioxide. "Siceba ukudibanisa i-NGF kwizixhobo ukwenzela ukuba isebenze njengento esebenzayo esebenzayo," kusho uCosta.
Ulwazi oluthe vetshe: Gitanjali Deokar et al., Ukukhula okukhawulezayo kweefilimu zegraphite ezityebileyo zenanometer kwi-wafer-scale nickel foil kunye nohlalutyo lwabo lwesakhiwo, iNanotechnology (2020). I-DOI: 10.1088/1361-6528/aba712
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Uluvo lwakho lubalulekile kuthi. Nangona kunjalo, ngenxa yomthamo ophezulu wemiyalezo, asinakuqinisekisa impendulo eyenzelwe wena.
Idilesi yakho ye-imeyile isetyenziselwa kuphela ukuxelela abamkeli abathumele i-imeyile. Idilesi yakho okanye idilesi yomamkeli ayisayi kusetyenziselwa nayiphi na enye injongo. Ulwazi olufakayo luya kuvela kwi-imeyile yakho kwaye aluyi kugcinwa nguPhys.org nangaluphi na uhlobo.
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Ixesha lokuposa: Sep-05-2024