To　achieve　strong　electromagnetic　wave　absorption　performance　at　thin　thicknesses,　a　chemical　vapor　deposition　approach　was　employed　to　prepare　Co　nanoclusters　modified　carbon　nanotubes.　The　main　mechanism　lies　in　the　formation　of　dispersed　oxides　on　the　basis　of　low　melting　point　and　decomposition　temperature　of　cobalt　nitrate　hexahydrate,　while　solid　oxides　are　not　easy　to　agglomerate　during　reduction　due　to　their　poor　diffusion　properties.　Additionally,　the　abundant　nitrogen-doped　on　carbon　nanotubes　provides　abundant　metal　deposition　sites,　which　further　inhibits　metal　agglomeration.　As　expected,　the　reflection　loss　was　robust　at　−59.96　dB　with　a　low　filler　loading　of　10　wt%,　and　the　bandwidth　was　broad　at　5.4GHz.　Several　factors　contribute　to　excellent　electromagnetic　wave　absorption,　such　as　multiple　reflections　and　scattering　in　the　internal　space,　dipole　polarization　loss　induced　by　plenty　of　functional　groups,　and　interfacial　polarization　loss　at　the　interfaces　between　Co　nanoclusters　and　carbon　nanotubes.　©　2022