Recently,
electromagnetic (EM) shielding (EMS) window, especially
the ultrathin, transparent EMS active layer, has been the primary
objective of extensive studies because of its widely potential applications
in stealth technology, high radiation pollution, and others. However,
several defects, including opacity and large thickness, have severely
restricted the application in optical EMS devices. Herein, we developed
an ultrathin and highly transparent EMS active layer on a rigid glass
and a flexible polyethylene terephthalate substrate by chemical doping
CVD (chemical vapor deposition) graphene with nitric acid (HNO
3
) as the P-type dopant, which has a 91% transmittance and
1/1000 thickness compared to the conventional EMS active layer. The
HNO
3
-treated graphene shows excellent EMS efficiency by
a factor of 4.5, significantly compensating for the adverse effects
of the grain boundaries between CVD graphene crystals. Additionally,
55% HNO
3
is the most suitable for achieving high EMS effectiveness,
which can be significantly improved by treating for only 5 min. This
unique chemical-doping CVD graphene holds potential for being exploited
as a transparent active layer in numerous EMS applications.
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