Tsis ntev los no, cov kws tshawb fawb ntawmTohoku University(Nyiv) tau siv femtosecond lasers kom ua tiav cov yeeb yaj kiab micro / nanographene, tsim cov qhov ntau yam tsis muaj kev puas tsuaj thiab tshem tawm cov kab mob. Pab neeg no hais tias cov txheej txheem yuav cia siab tias yuav hloov cov qauv siv, ntau txoj hauv kev, ua rau muaj peev xwm nce qib hauv quantum cov ntaub ntawv tshawb fawb thiab kev txhim kho biosensor.
Graphene tau tshawb pom hauv xyoo 2004, thiab nws qhov cuam tshuam cuam tshuam txij li tau cuam tshuam ntau yam kev tshawb fawb. Nws muaj cov khoom zoo kawg nkaus xws li kev txav hluav taws xob siab, kev siv lub zog, thiab thermal conductivity. Txog rau tam sim no, kev lag luam tau nqis peev ntau lub sijhawm thiab kev siv zog los tshawb txog lub peev xwm ntawm graphene ua cov khoom siv semiconductor tom ntej, ua rau kev txhim kho graphene-based transistors, pob tshab electrodes, thiab sensors.
Txawm li cas los xij, tus yuam sij ua rau cov cuab yeej no muaj rau kev siv tau zoo yog kev ua haujlwm zoo, uas tseem txhais tau hais tias graphene films tuaj yeem tsim los ntawm micro- thiab nano-scale. Feem ntau, nanolithography thiab tsom ion beam txoj kev yog siv rau micro / nanoscale cov khoom ua thiab cov cuab yeej fabrication. Txawm li cas los xij, qhov xav tau ntawm cov cuab yeej loj, lub sijhawm tsim khoom ntev, thiab kev ua haujlwm nyuaj ua rau muaj kev nyuaj siab ntev rau cov kws tshawb fawb hauv chav kuaj.
Rov qab rau Lub Ib Hlis, cov kws tshawb fawb ntawm Tohoku University hauv Nyij Pooj tau tsim cov txheej txheem uas tso cai rau micro / nanofabrication ntawm nyias silicon nitride cov khoom siv nrog tuab ntawm 5 txog 50 nanometers. Txoj kev siv afemtosecond laseruas emits luv heev, ceev ceev pulses ntawm lub teeb. Nws tau ua pov thawj tias tuaj yeem ua cov ntaub ntawv nyias sai thiab yooj yim yam tsis muaj lub tshuab nqus tsev.
Los ntawm kev siv cov qauv no rau cov txheej txheem ultra-thin atomic ntawm graphene, tib pab pawg tshawb fawb tau ua tiav cov ntsiab lus ntau qhov drilling yam tsis muaj kev puas tsuaj rau graphene zaj duab xis. Lawv txoj kev vam meej nrog qhov kev ua tiav no tau tshaj tawm nyob rau lub Tsib Hlis 16, 2023 qhov teeb meem ntawm Nano Letters.
Yuuki Uesugi, tus pab xibfwb ntawm Multidisciplinary Research Institute for Advanced Materials ntawm Tohoku University hauv Nyij Pooj thiab tus kws sau ntawv ntawm daim ntawv, tau hais tias, "Los ntawm kev tswj xyuas lub zog nkag thiab cov lej ntawm cov khoom siv laser, peb tuaj yeem ua tiav kev ua tiav thiab tsim lub qhov nrog cov kab uas hla ntawm 70 nm mus rau ntau tshaj 1 hli, uas yog me dua li 520 nm laser wavelength. "
Tom qab kev soj ntsuam ze dua ntawm thaj chaw irradiated los ntawm lub zog qis zog laser mem tes los ntawm lub tshuab hluav taws xob ua haujlwm siab, Uesugi thiab nws cov npoj yaig pom tias cov kab mob kis tau los ntawm graphene. Kev soj ntsuam ntxiv tau nthuav tawm cov nanopores tsawg dua 10 nm nyob rau hauv txoj kab uas hla thiab atomic-theem tsis xws luag hauv cov qauv siv lead ua ntawm graphene, qhov twg ntau cov pa roj carbon atoms tau ploj lawm.
Nyob ntawm daim ntawv thov, atomic defects hauv graphene muaj ob qho kev puas tsuaj thiab muaj txiaj ntsig zoo. Txawm hais tias qhov tsis xws luag tuaj yeem ua rau qee yam khoom tsis zoo, lawv tuaj yeem qhia cov haujlwm tshiab lossis txhim kho cov khoom tshwj xeeb.
Uesugi ntxiv, "Peb tau pom qhov kev nyiam rau qhov ntom ntom ntawm nanopores thiab qhov tsis xws luag kom nce proportionally nrog lub zog thiab tus naj npawb ntawm laser irradiations thiab xaus lus tias - kev tsim cov nanopores thiab cov teeb meem tuaj yeem tswj tau los ntawm kev siv femtosecond laser irradiation." "Los ntawm kev tsim nanopores thiab atomic-level defects nyob rau hauv graphene, nws muaj peev xwm tswj tsis tau tsuas yog conductivity tab sis kuj quantum-level zog xws li spin thiab hav. Tsis tas li ntawd, lub femtosecond laser tshem tawm cov kab mob nyob rau hauv qhov kev tshawb fawb no yuav ua rau txoj kev loj hlob. ntawm ib txoj kev tshiab rau kev tsis muaj kev puas tsuaj ntawm ntxuav high-purity graphene. "
Saib tom ntej, pab neeg no tsom mus tsim cov txheej txheem ntxuav siv lasers thiab ua cov kev tshawb fawb ntxaws txog yuav ua li cas thiaj ua tau qhov kev tsim kho atomic. Kev ua tiav ntxiv yuav muaj kev cuam tshuam loj rau thaj chaw xws li kev tshawb fawb txog cov ntaub ntawv quantum mus rau kev txhim kho biosensor.
