Graphene muaj ib txheej ntawm carbon atoms teem nyob rau hauv ib tug hexagonal lattice.Cov khoom siv no hloov tau yooj yim thiab muaj cov khoom siv hluav taws xob zoo heev, ua rau nws txaus nyiam rau ntau daim ntawv thov - tshwj xeeb yog cov khoom siv hluav taws xob.
Cov kws tshawb fawb coj los ntawm xibfwb Christian Schönenberger los ntawm Swiss Institute of Nanoscience thiab Department of Physics ntawm University of Basel tau kawm yuav ua li cas los tswj cov txheej txheem.hluav taws xob khoom ntawm cov ntaub ntawv los ntawm mechanical stretching.Yuav kom ua tau li no, lawv tau tsim ib lub moj khaum los ntawm cov txheej txheem atomically nyias graphene tuaj yeem ncav cuag kev tswj hwm thaum ntsuas nws cov khoom siv hluav taws xob.
Thaum lub siab yog thov los ntawm hauv qab no, cov khoom yuav khoov.Qhov no ua rau cov txheej graphene embedded rau elongate thiab hloov nws cov khoom hluav taws xob.
Sandwiches ntawm lub txee
Cov kws tshawb fawb thawj zaug tsim ib qho "sandwich" sandwich nrog ib txheej ntawm graphene ntawm ob txheej ntawm boron nitride.Cov khoom uas muab nrog hluav taws xob tiv tauj yog siv rau qhov hloov tau yooj yim substrate.
Hloov lub xeev hluav taws xobCov kws tshawb fawb thawj zaug siv cov txheej txheem kho qhov muag los ntsuas qhov ncab ntawm graphene.Tom qab ntawd lawv siv hluav taws xob Kev ntsuas kev thauj mus los kawm seb qhov deformation ntawm graphene hloov pauv lub zog hluav taws xob li cas.Cov no Kev ntsuas yuav tsum tau ua ntawm rho tawm 269 ° C kom pom kev hloov pauv hluav taws xob.
Cov cuab yeej hluav taws xob qib daim duab kos duab ntawm ib qho tsis muaj graphene thiab b strained (ntsuab ntxoov ntxoo) graphene ntawm qhov nruab nrab ntawm tus nqi (CNP). "Qhov kev ncua deb ntawm nuclei cuam tshuam ncaj qha rau cov yam ntxwv ntawm cov hluav taws xob hauv graphene," Baumgartnertau sau tseg cov txiaj ntsig."Yog hais tias lub stretching yog uniform, tsuas yog lub electron ceev thiab lub zog hloov tau. Qhov kev hloov nyob rau hauvlub zog yog qhov tseem ceeb ntawm lub peev xwm scalar kwv yees los ntawm kev xav, thiab tam sim no peb tau muaj peev xwm ua pov thawj qhov no los ntawmkev sim." Nws pom tau tias cov txiaj ntsig no yuav ua rau kev txhim kho cov sensors lossis hom tshiab ntawm transistors.Ntxiv rau,graphene, raws li tus qauv qauv rau lwm cov khoom siv ob sab, tau dhau los ua cov ntsiab lus tseem ceeb ntawm kev tshawb fawb thoob ntiaj teb hauvxyoo tas los no.
Lub sij hawm xa tuaj: Plaub Hlis-02-2021