Ionic liquid-assisted direct synthesis of PdO nanoparticles immobilized on boehmite nanoparticles

We demonstrated a simple route to simultaneously synthesize PdO and boehmite nanoparticles, and to directly immobilize the former on the latter using an ionic liquid (IL)-assisted one-pot solution method. PdO nanoparticles were directly immobilized on boehmite nanoparticles, and their amount and distribution were controlled by the stoichiometry of the mixture. In particular, γ-alumina nanofibers, which were topochemically transformed from boehmites, exhibited lengths of ca. 40–70 nm and diameters of ca. 1.5–3 nm, while PdO nanoparticles had diameters of ca. 2–4 nm. The nanocrystalline structures of the PdO nanoparticles immobilized on the boehmite nanoparticles were characterized by high-resolution transmission electron microscopy (HR–TEM), X–ray diffraction (XRD), and 27Al nuclear magnetic resonance (NMR). The one-step synthetic method described herein allows for the design and fabrication of host–guest systems of inorganic or metallic nanomaterials with hetero-nanostructures.

Graphical abstractThe PdO nanoparticle immobilized on boehmite or γ-alumina nanoparticles were readily synthesized through an ionic liquid (IL)-assisted one-pot solution method by controlling chemical compositions.Figure optionsDownload full-size imageDownload high-quality image (39 K)Download as PowerPoint slideResearch highlights► PdO nanoparticles were immobilized on boehmite nanoparticles through an IL-assisted synthesis. ► The nanostructures of PdO and boehmite were co-constructed at a proper stoichiometry. ► The morphology of the as-obtained nanomaterials was characterized by TEM and STEM. ► The molecular structures of the as-obtained nanomaterials were analyzed by XRD and 27Al NMR.