Urakoze kwiyandikisha muri fiziki yisi Niba ushaka guhindura amakuru yawe umwanya uwariwo wose, nyamuneka sura konti yanjye
Filime ya Graphite irashobora gukingira ibikoresho bya elegitoronike imirasire ya electromagnetic (EM), ariko tekinike zubu zo kubikora bifata amasaha menshi kandi bisaba ubushyuhe bwo gutunganya hafi 3000 ° C. Itsinda ry’abashakashatsi bo muri Laboratwari y’igihugu ya Shenyang y’ubumenyi bw’ibikoresho mu Ishuri Rikuru ry’Ubushinwa ryerekanye ubundi buryo bwo gukora filime nziza ya grafite mu masegonda make gusa mu kuzimya imirongo ishyushye ya nikel foil muri Ethanol. Iterambere ryiyongera kuri ziriya firime rirenze ibyiciro bibiri byubunini burenze muburyo buriho, kandi amashanyarazi ya firime nimbaraga za mashini birasa naya firime yakozwe hifashishijwe imyuka ya chimique (CVD).
Ibikoresho byose bya elegitoronike bitanga imirasire ya EM. Mugihe ibikoresho bigenda biba bito kandi bigakorera kumurongo mwinshi kandi muremure, ubushobozi bwo guhuza amashanyarazi (EMI) burakura, kandi birashobora kugira ingaruka mbi kumikorere yibikoresho kimwe na sisitemu ya elegitoroniki iri hafi.
Graphite, allotrope ya karubone yubatswe mubice bya graphene ifatanije ningabo za van der Waals, ifite ibintu byinshi bidasanzwe byamashanyarazi, ubushyuhe nubukanishi bituma iba ingabo ikomeye irwanya EMI. Ariko, igomba kuba muburyo bwa firime yoroheje cyane kugirango igire amashanyarazi menshi, aringirakamaro mubikorwa bya EMI bifatika kuko bivuze ko ibikoresho bishobora kwerekana no gukurura imiraba ya EM mugihe ikorana nabatwara ibicuruzwa imbere ni.
Kugeza ubu, inzira nyamukuru zo gukora firime ya grafite zirimo pyrolysis yubushyuhe bwo hejuru bwa polymers ya aromatic cyangwa guteranya graphene (GO) oxyde cyangwa graphene nanosheets kumurongo. Inzira zombi zisaba ubushyuhe bwo hejuru ya 3000 ° C hamwe nigihe cyo gutunganya isaha. Muri CVD, ubushyuhe bukenewe buri hasi (hagati ya 700 na 1300 ° C), ariko bisaba amasaha make kugirango ukore firime yuburebure bwa nanometero, ndetse no mu cyuho.
Itsinda riyobowe na Wencai Ren ubu ryakoze firime nziza ya grafite ya metero icumi za nanometero zibyibushye mu masegonda make ashyushya nikel foil kugeza kuri 1200 ° C mu kirere cya argon hanyuma ihita yinjiza iyi fayili muri Ethanol kuri 0 ° C. Atome ya karubone ikomoka ku kubora kwa Ethanol ikwirakwira hanyuma igashonga muri nikel bitewe n’icyuma kinini cya karuboni (0.4 wt% kuri 1200 ° C). Kuberako ubu busembwa bwa karubone bugabanuka cyane mubushyuhe buke, atome ya karubone nyuma igatandukanya kandi ikagwa hejuru ya nikel mugihe cyo kuzimya, ikabyara firime ya grafite. Abashakashatsi bavuga ko ibikorwa byiza bya catalitiki ya nikel bifasha no gukora grafite ya hrstalline cyane.
Bakoresheje ikomatanya rya microscopi yohereza cyane, itandukanya X-ray na Raman spectroscopy, Ren na bagenzi be basanze igishushanyo mbonera bakoze cyari kristaline cyane ahantu hanini, ku buryo bwiza kandi nta nenge zigaragara. Imiyoboro ya elegitoronike ya firime yari hejuru ya 2,6 x 105 S / m, isa na firime zatewe na CVD cyangwa tekinike yubushyuhe bwo hejuru no gukanda firime ya GO / graphene.
Kugirango hamenyekane neza niba ibikoresho bishobora guhagarika imirasire ya EM, itsinda ryimuye firime ifite ubuso bwa mm2 600 kuri substrate ikozwe muri polyethylene terephthalate (PET). Nyuma bapimye EMI ikingira firime (SE) murwego rwa X-band, hagati ya 8.2 na 12.4 GHz. Basanze EMI SE irenga 14.92 dB ya firime igera kuri 77 nm. Agaciro kiyongera kuri dB zirenga 20 (agaciro ntarengwa gasabwa mubisabwa mubucuruzi) muri X-band yose mugihe bashyize hamwe firime nyinshi. Mubyukuri, firime ikubiyemo ibice bitanu bya firime ya grafite (hafi 385 nm yuburebure muri rusange) ifite EMI SE ya 28 dB, bivuze ko ibikoresho bishobora guhagarika 99.84% byimirasire yibyabaye. Muri rusange, itsinda ryapimye EMI ikingira 481.000 dB / cm2 / g hakurya ya X-band, iruta ibikoresho byose byavuzwe mbere.
Abashakashatsi bavuga ko bakurikije ubumenyi bwabo, firime yabo ya grafite niyo yoroheje mu bikoresho bivugwa ko bikingira, hamwe na EMI ikingira ishobora guhaza ibisabwa mu bucuruzi. Ibikoresho byubukanishi nabyo ni byiza. Imbaraga zavunitse zingana na MPa zigera kuri 110 (zivuye mumaganya - umurongo utambitse wibikoresho byashyizwe kumurongo wa polyakarubone) urenze uw'amafirime ya grafite akoreshwa nubundi buryo. Filime iroroshye, nayo, kandi irashobora kugororwa inshuro 1000 hamwe na radiyo igoramye ya mm 5 idatakaje EMI ikingira. Ifite kandi ubushyuhe bugera kuri 550 ° C. Iri tsinda ryizera ko iyi mitungo n’indi isobanura ko ishobora gukoreshwa nka ultrathin, yoroheje, yoroheje kandi ikora neza ya EMI ikingira ibikoresho mu bice byinshi, harimo icyogajuru kimwe na elegitoroniki na optoelectronics.
Soma iterambere ryingenzi kandi rishimishije mubikoresho siyanse muri iki kinyamakuru gishya gifungura.
Isi ya fiziki yerekana igice cyingenzi cyubutumwa bwa IOP bwo gutangaza amakuru yo ku rwego rwisi no guhanga udushya kubantu benshi bashoboka. Urubuga rugize igice cya fiziki yisi yose, icyegeranyo cya serivise zamakuru kumurongo, digitale no gucapa amakuru kumuryango wubumenyi bwisi yose.
Igihe cyo kohereza: Gicurasi-07-2020