Posachedwapa, Sun Rong ndi ofufuza ena ofanana nawo ochokera ku Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences adapereka njira yosavuta yochizira kutentha kuti akonze zinthu zopepuka za thovu la melamine (CMF/rGO/Ag) lopangidwa ndi siliva/graphene oxide. Zipangizo za thovu la melamine zopangidwa ndi kaboni zinapereka mphamvu zabwino kwambiri zamakaniko komanso mphamvu zabwino kwambiri zotetezera EMI (EMI SE).
Kukwera kwa kulumikizana kwa 5G ndi mafoni anzeru kwakulitsa vuto la kusokoneza ma electromagnetic.
Kusokoneza kwakukulu kwa ma elekitiroma kungayambitse kutayika kwa data, kulephera kwadongosolo, komanso kuyika thanzi la anthu pachiwopsezo.
Kupanga zida zodzitchinjiriza zowoneka bwino kwambiri zokhala ndi kachulukidwe kotsika kwambiri komanso kusinthasintha kwamakina ndi njira yabwino yopondereza kuyipitsidwa koyipa kwa mafunde amagetsi kapena ma radiation.
Kwa zida zachitsulo zachikhalidwe, kuwongolera ma conductivity nthawi zonse kwakhala njira yoyamba yopezera zida zoteteza kwambiri.
Kuphatikiza apo, ma nanomatadium atsopano monga graphene, carbon nanotubes, ndi MXene adanenedwanso kuti ali ndi ntchito yoteteza kwambiri ya EMI.
Chifukwa cha njira yosinthira kwambiri yopanga ma nanomatadium, zidazi zimasinthidwa kukhala thovu kapena mawonekedwe a kanema kuti atetezere EMI. Poyerekeza ndi mawonekedwe a thovu a nanomatadium, mafilimu wandiweyani amawonetsa kuwongolera kwambiri.
Ma conductivity apamwamba amatha kupanga mwachindunji EMI SE yayikulu powonetsa mwamphamvu mafunde amagetsi amagetsi.
Mwachitsanzo, ma electromagnetic wave reflection coefficient of high conductive metals nthawi zambiri amaposa 90%, zomwe zikutanthauza kuti 90% ya mafunde a electromagnetic amawonekera pamalo aulere.
Mafunde owonetseredwa a electromagnetic amathanso kuwononga kwambiri ma radiation yachiwiri yamagetsi. Zimakhala zovuta kupeza zida zotchinjiriza za EMI zapamwamba zokhala ndi ma electromagnetic wave reflection coefficient.
Chotchinga chamtundu wa thovu chimapangidwa ndi porous. Chifukwa cha kulemera kwake, kulimba kwa makina abwino komanso kusinthika kwa EMI kutchinga, ili ndi kuthekera kwakukulu m'malo mwa zida zotchinjiriza zachitsulo zokhazikika.
Makamaka, mawonekedwe a porous amathandizira kuti zinthu zotchingira zamtundu wa thovu zikhale ndi zowonekera zingapo pamafunde a electromagnetic, kotero kuti thovulo limatha kuyamwa ndikuchepetsa mafunde amagetsi. Zanenedwa kuti mawonekedwe a porous adzakulitsa kuyamwa kwa mafunde a electromagnetic ndi MXene.
Poyerekeza ndi zida zolimba, mawonekedwe a porous amakhala ndi mphamvu yofananira ndi ma electromagnetic wave, ndipo amatha kupangitsa kuti mafunde a electromagnetic alowe mkati mwa thovu lotchinga. Chifukwa chake, zida zotchingira za EMI zokhala ndi mawonekedwe otsika komanso mayamwidwe apamwamba ziyenera kukhala ndi zofananira bwino (zocheperako) komanso zowunikira zingapo. Mwachitsanzo, zomanga zosanjikiza, zomanga zamitundu yambiri ndi zida za isotropic zakonzedwa, zokhala ndi EMI SE yayikulu komanso ma coefficients oyamwa. Nthawi zambiri, zomangira zovuta komanso zigawo zambiri nthawi zambiri zimakhala ndi masitepe angapo, ndipo kusinthasintha kwamakina kumakhala koyipa.
Foam yopangidwa ndi siliva ya polyimide idakonzedwa ndi kupopera mbewu mankhwalawa, ndipo kachulukidwe ake anali 23kg/m3. Chithovu cha melamine chopangidwa ndi siliva chinakonzedwa ndi kuyika kwa mankhwala. Chithovu chopangidwa ndi siliva chopangidwa ndi melamine chili ndi EMI mkulu SE wa 90 dB ndi siliva wa 63.5 wt%. Kuphatikiza apo, mkuwa/nickel wokutidwa ndi thovu wosakanizidwa wa polymethacrylimide ndi golide wa nanoparticle wokutidwa ndi polima opangidwa ndi nanofiber electromagnetic interference shielding electroless plating njira imaperekedwanso.
Komabe, chifukwa cha kusagwirizana kwachibadwidwe pakati pa chitsulo cholimba ndi chimango chosinthika, zida zotchingira thovu zopangidwa ndi electroplating, plating yopanda ma electroless ndi kupopera mbewu mankhwalawa zili ndi zida zosauka zamakina. Kupititsa patsogolo kugwirizana pakati pa zitsulo zachitsulo ndi mafupa a thovu osinthasintha komanso kuzindikira zipangizo zotetezera thovu zokhala ndi makina abwino kwambiri zimakhalabe zovuta.
Pakafukufukuyu, wolembayo adapereka njira yosavuta yopangira kutentha kwa sitepe imodzi kuti akonzekere siliva wopepuka / wocheperako wa graphene oxide wokutira carbonized melamine (CMF/rGO/Ag) zinthu zopangidwa ndi thovu, zomwe zimakhala ndi makina abwino kwambiri komanso Kuteteza kwabwino kwa EMI (EMI SE). Chifukwa cha mawonekedwe okhathamiritsa pakati pa chimango chophatikizika ndi siliva, thovu la CMF/rGO/Ag linawonetsa kukhazikika kwadongosolo pambuyo pa maulendo 1000 otsitsa ndikutsitsa. Kuphatikiza apo, EMI SE ya thovu idafika ku 50.6 dB pa kachulukidwe ka 16 mg cm2 g-1 yokha ndi ultra-low Ag zili 0.09 vol%.
Chochititsa chidwi n'chakuti, mgwirizano wa porous framework ndi ma interfaces angapo anachititsa kuti mayamwidwe apamwamba kwambiri (kupitirira 0.5) a foam ya CMF/rGO/Ag. Njira yotchinga yotchinga kwambiri ya foam ya CMF/rGO/Ag idaphunziridwanso ndi finite element analysis (FEA). Kuchita kwabwino kwambiri kwa EMI kutchingira kwa CMF/rGO/Ag thovu kukuwonetsa kuti thovu lotsika kwambiri, lolimba la CMF/rGO/Ag lili ndi zabwino zambiri komanso mwayi wogwiritsa ntchito ngati zida zotchinjiriza za EMI pakuyika pakompyuta.