We show that graphene decorated with Ag nanodisks realizes spectrally selective thermal emission by means of acoustic graphene plasmons (AGPs) localized between graphene and the Ag nanodisks inside a dielectric material. Our finite-difference time domain (FDTD) calculations show that the spectrally selective thermal radiation emission can be tuned by means of a gate voltage into two different wavelength regimes, namely the atmospherically opaque regime between λ = 5 μm and λ = 8 μm or the atmospherically transparent regime between λ = 8 μm and λ = 12 μm. This allows for electrical switching between a radiative heat trapping mode for the former regime and a radiative cooling mode for the latter regime.
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