Tsis ntev los no, Sun Rong thiab lwm cov kws tshawb fawb cuam tshuam los ntawm Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences tau tawm tswv yim ib kauj ruam yooj yim rau kev kho cua sov los npaj cov khoom siv ua npuas ncauj uas muaj nyiaj / txo qis graphene oxide coated carbonized melamine (CMF / rGO / Ag). Cov khoom siv ua npuas ncauj carbonized-composite melamine muab cov khoom siv kho tshuab zoo heev thiab cov nyhuv tiv thaiv EMI zoo heev (EMI SE).
Kev nce ntawm 5G kev sib txuas lus thiab cov xov tooj ntse tau ua rau qhov teeb meem ntawm kev cuam tshuam electromagnetic aggravation zuj zus tuaj.
Kev cuam tshuam hluav taws xob loj heev tuaj yeem ua rau cov ntaub ntawv poob, kev ua tsis tiav ntawm lub kaw lus, thiab txawm tias ua rau tib neeg muaj kev noj qab haus huv txaus ntshai.
Kev tsim cov khoom siv tiv thaiv kev cuam tshuam hluav taws xob zoo uas muaj qhov ceev tsawg heev thiab kev ywj pheej zoo yog ib txoj hauv kev zoo los tswj kev ua qias tuaj ntawm hluav taws xob lossis hluav taws xob.
Rau cov ntaub ntawv hlau ib txwm muaj, kev txhim kho kev coj hluav taws xob yeej ib txwm yog lub tswv yim tseem ceeb rau kev ua tiav cov ntaub ntawv tiv thaiv kev ua tau zoo.
Tsis tas li ntawd xwb, cov khoom siv nano tshiab xws li graphene, carbon nanotubes, thiab MXene kuj tau tshaj tawm tias muaj kev ua tau zoo ntawm EMI shielding.
Vim yog cov txheej txheem tsim khoom yooj ywm heev ntawm cov nanomaterials, cov ntaub ntawv no raug ua tiav rau hauv cov ua npuas ncauj lossis zaj duab xis rau EMI shielding. Piv nrog rau daim ntawv ua npuas ncauj ntawm cov nanomaterials, cov yeeb yaj kiab ntom ntom qhia tau tias muaj kev coj ua hluav taws xob siab dua.
Kev ua hluav taws xob siab tuaj yeem ncaj qha tsim cov EMI SE siab los ntawm kev cuam tshuam cov nthwv dej electromagnetic.
Piv txwv li, qhov coefficient ntawm kev cuam tshuam ntawm cov hlau uas muaj hluav taws xob ntau feem ntau tshaj 90%, uas txhais tau tias 90% ntawm cov hluav taws xob electromagnetic uas tshwm sim yuav raug cuam tshuam rau hauv qhov chaw dawb.
Cov nthwv dej hluav taws xob uas cuam tshuam kuj tseem tuaj yeem ua rau muaj kev ua qias tuaj ntawm cov hluav taws xob hluav taws xob thib ob. Nws tseem yog ib qho nyuaj rau kom tau txais cov ntaub ntawv tiv thaiv EMI ua haujlwm siab nrog cov coefficient ntawm kev cuam tshuam nthwv dej hluav taws xob qis.
Cov khoom siv tiv thaiv ua npuas ncauj no muaj cov qauv porous. Vim nws qhov hnyav sib dua, zoo compressibility thiab hloov kho EMI shielding kev ua tau zoo, nws muaj peev xwm zoo hauv kev hloov cov khoom siv hlau ruaj khov ib txwm muaj.
Tshwj xeeb, cov qauv porous ua rau cov khoom siv tiv thaiv ua npuas ncauj muaj ntau qhov kev cuam tshuam ntawm cov nthwv dej electromagnetic, yog li ntawd cov ua npuas ncauj tuaj yeem nqus thiab txo cov nthwv dej electromagnetic. Nws tau raug tshaj tawm tias cov qauv porous yuav txhim kho kev nqus ntawm cov nthwv dej electromagnetic los ntawm MXene.
Piv nrog cov khoom khov kho, cov qauv porous muaj peev xwm zoo dua electromagnetic wave impedance matching, thiab tuaj yeem ua rau cov electromagnetic wave nkag mus rau hauv cov qauv sab hauv ntawm cov ua npuas ncauj tiv thaiv. Yog li ntawd, cov ntaub ntawv tiv thaiv EMI nrog cov coefficient reflection qis thiab cov coefficient nqus siab yuav tsum muaj kev sib phim impedance zoo (kev cuam tshuam qis) thiab ntau qhov kev cuam tshuam siab. Piv txwv li, cov qauv txheej, cov qauv ntau txheej thiab cov qauv isotropic tau npaj, nrog EMI SE siab thiab cov coefficient nqus siab. Feem ntau hais lus, cov qauv nyuaj thiab ntau yam khoom feem ntau cuam tshuam nrog kev ua ntau kauj ruam, thiab kev hloov pauv tsis zoo.
Cov ua npuas ncauj polyimide uas muaj nyiaj tau npaj los ntawm kev txau lub cev, thiab nws qhov ceev yog 23kg / m3. Cov ua npuas ncauj melamine uas muaj nyiaj tau npaj los ntawm kev tso tshuaj lom neeg. Cov ua npuas ncauj melamine uas tau npaj lawm muaj EMI siab SE ntawm 90 dB thiab cov nyiaj muaj 63.5 wt%. Tsis tas li ntawd, ib txoj kev ua npuas ncauj polymethacrylimide sib xyaw uas muaj tooj liab / nickel coated thiab kub nanoparticle coated polymer-based nanofiber electromagnetic interference shielding electroless plating kuj tau pom zoo.
Txawm li cas los xij, vim muaj qhov tsis sib xws ntawm cov hlau khov kho thiab lub thav duab ywj pheej, cov khoom siv tiv thaiv hlau ua npuas ncauj uas npaj los ntawm electroplating, electroless plating thiab kev txau lub cev muaj cov khoom siv tsis zoo. Txhim kho kev sib txuas ntawm cov hlau me me thiab cov pob txha ua npuas ncauj ywj pheej thiab kev ua tiav cov khoom siv tiv thaiv hlau ua npuas ncauj nrog cov khoom siv zoo heev tseem muaj ntau yam kev cov nyom.
Hauv txoj kev tshawb fawb no, tus sau tau hais txog ib kauj ruam yooj yim los npaj cov khoom siv ua npuas dej uas muaj cov nyiaj/txo cov graphene oxide uas tau coated nrog carbonized melamine (CMF/rGO/Ag), uas muaj cov khoom siv kho tshuab zoo heev thiab muaj txiaj ntsig zoo rau EMI shielding (EMI SE). Vim yog qhov sib txuas ntawm cov qauv sib xyaw thiab cov nyiaj, CMF/rGO/Ag ua npuas dej tau qhia txog kev ruaj khov zoo heev tom qab 1000 lub voj voog sim kev thauj khoom thiab tshem tawm. Tsis tas li ntawd, EMI SE ntawm ua npuas dej tau txog 50.6 dB ntawm qhov ceev ntawm tsuas yog 16 mg cm2 g-1 thiab cov ntsiab lus Ag qis heev ntawm 0.09 vol%.
Qhov nthuav yog tias kev koom tes ntawm lub moj khaum porous thiab ntau qhov sib txuas ua rau muaj qhov nqus coefficient siab tshaj (ntau dua 0.5) ntawm CMF/rGO/Ag ua npuas ncauj. Lub tshuab tiv thaiv coefficient nqus siab ntawm CMF/rGO/Ag ua npuas ncauj tau kawm ntxiv los ntawm kev tshuaj xyuas cov ntsiab lus kawg (FEA). Kev ua tau zoo ntawm EMI tiv thaiv ze ntawm thaj chaw ntawm CMF/rGO/Ag ua npuas ncauj qhia tau tias qhov ceev qis, CMF/rGO/Ag ua npuas ncauj muaj zog muaj qhov zoo heev thiab kev cia siab dav dav ua cov ntaub ntawv tiv thaiv EMI rau kev ntim khoom hluav taws xob.