Microwave‐Assisted Nonaqueous Synthesis of Doped Ceria Nanoparticles Assembled into Flakes

Abstract

Undoped and doped CeO2 nanoparticles were synthesized through a combination of microwave‐assisted nonaqueous sol‐gel route and thermal treatment at 300 °C. Nanocrystals of 3 nm were obtained and characterized in detail by Rietveld refinement analysis of the X‐ray diffraction data and by electron microscopy. The refinement indicated that the doping with 3d transition metals (Co, Cu, Fe, and Ni) was successfully achieved and this result was additionally confirmed by EDX measurements. Investigation of the particle morphology by electron microscopy revealed that the nanocrystals were generally not present as primary particles, but self‐assembled into often intergrown flakes with uniform diameters of about 150 nm. In selected cases, the ceria nanocrystals are crystallographically oriented with respect to each other within one flake. BET measurements revealed a high surface area of 126 m2·g–1.

Large Dimensional CeO2 Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity

“…This agrees with the hysteresis loops of N 2 sorption isotherms, resulting in slit‐shaped pores. Flake‐like CeO 2 structures were reported before, but the flake sizes were much smaller (<200 nm in diameter) than those in this study ,…”

“…Different morphologies of CeO 2 can also be obtained by microwave‐assisted routes, such as nanoparticles,– hollow nanospheres, core‐shell structures, nanocubes, nanowires,, and small nanoflakes (<200 nm in diameter) . Nanoflake‐structured CeO 2 has shown excellent properties in sensors or catalytic applications due to more defects exposed on the surface of layered structure.…”

“…Nanoflake‐structured CeO 2 has shown excellent properties in sensors or catalytic applications due to more defects exposed on the surface of layered structure. However, to date there were only few reports about nanoflakes of CeO 2 , and most of the sheets had a small size (<200 nm in diameter), or were hybrids with other materials ,. CeO 2 nanoflakes with large dimension and thin layers is still waiting for development, which probably exhibit outstanding properties due to more defects exposing on the particle surface of thin layers and easy transfer of active oxygen atoms (O*) within the organized layer particles.…”

Growth and composition of nanostructured and nanoporous cerium oxide thin films on a graphite foil

“…One of the very promising materials is CeO x , which has recently been gaining a lot of research attention. [1][2][3][4][5][6][7][8][9][10][11][12][13] Cerium oxide is valued for its high oxygen storage capacity, i.e. ability to easily release, store or transport oxygen accompanied by transition between two stable states, 14,15 Ce 3+ and Ce 4+ , and for its ability to enhance the activity of transient metal and metal oxide catalysts.…”

Study of Antibacterial Effect of Cerium Oxide Nanoparticles on Escherichia Coli Microorganism

“…Some microorganisms are harmful for human body and cause diseases in different ways such as E.Coli bacteria, staphylococcus aureus, and pseudomonas [6]. NCO particles are pale-yellow-white powder.…”