In this article, we demonstrate that TiO@carbon core/shell (TiO@C) nanocomposite photocatalysts prepared by carbonizing a single molecular layer of aromatic compounds adsorbed on the surface of TiO nanoparticles selectively enhance the generation of hydrogen peroxide (HO). Atomically thin carbon shells have been formed directly on the surface of TiO nanoparticles through pyrolytic decarboxylation of the adsorbed aromatic compounds, benzoic acid (BA), and 1-naphthoic acid (NA), which yields two types of TiO@C nanocomposites, TiO@C(BA) and TiO@C(NA). Raman spectroscopy shows that the as-obtained nanocomposites have similar degrees of graphitization (D/G band ratio), regardless of the type of aromatic precursors, but TiO@C(NA) contains more oxygenic species than TiO@C(BA) (D*/G band ratio).
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