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Vertically aligned carbon nanotubes (VA‐CNTs) of 2.3 µm in height were produced by thermal chemical vapor deposition (TCVD) on Si/SiO2 substrates. These carbon arrays were coated with zinc oxide (ZnO) via atomic layer deposition (ALD) technique. Conformal, uniform and very thin films (max. 26 nm) around the CNTs were obtained after 200 ALD cycles. The photocatalytic performance of these nanocomposite...