A novel method was developed to synthesize reduced graphene oxide/alumina nanocomposite (RGO/Al2O3) by in situ depositing Al2O3 nanoparticles on graphene oxide flakes by a dry sol–gel process. The scanning electron microscopy and energy dispersive X‐ray spectroscopy investigations results showed that Al2O3 nanoparticles (19 ± 5 nm) were homogeneously distributed onto the surface of curly‐shaped RGO flakes acting as a spacer between individual flakes. The high BET‐specific surface area of the analyzed composite (242.4 m2/g) together with very low open porosity indicates that RGO/Al2O3 nanocomposites have a very friable structure and show low tendency to agglomeration.

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The present article presents first comparative study on three different dry solgel methods of producing new alumina‐based dark violet, light pink ceramic nanopigments as well as ruby‐red ceramic nanopigment — an alternative to the Purple of Cassius. Gold nanoparticles are built directly on a carrier of an aluminum oxide nanopowder, which finally yields Al2O3/Au nanopowders possessing colors ranging from light pink to light violet as well as ruby‐red.

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