Controllable Synthesis of Ceria Nanoparticles with Uniform Reactive {100} Exposure Planes

Abstract

We investigate, by a systematic first-principles calculation, the surface energies of ceria {100} crystal planes with adsorption of 13 kinds of nonmetallic elements and nine kinds of metallic elements. We predict theoretically that adsorption of nonmetallic B, C, F, Si, P, S, Cl, Br, OH, and I and metallic Sr, La, Mg, Na, K, Y, Ca, and Ba can stabilize the ceria {100} planes through lowering their surface energies. Experimentally, we purposely select KOH as a mineralizing agent by taking into account the calculated surface energies and the factors in hydrothermal synthesis, and demonstrate a successful production of cube-shaped ceria nanoparticles of high purity via carefully optimizing the synthesis parameters. Further comprehensive transmission electron microscopy study identifies all the exposure planes of the cube-shaped ceria nanoparticles as the uniform {100} crystal planes. As a result of this unique morphology, the nanoparticles are found to show markedly enhanced UV-absorption capability as compared to either octahedron-shaped ceria nanoparticles or bulk ceria.

Porous cerium dioxide hollow spheres and their photocatalytic performance

“…The spacing of the measured 2D lattice fringes was close to 0.27 nm indexed to the interplanar spacing of the (100) plane of the outside and inside surfaces. [22][23][24] To understand the formation mechanism of the porous-hollow structure, samples synthesized with different reaction times were collected and analyzed. A plausible formation scheme of the hollow CeO 2 sphere is illustrated in Scheme 1.…”

Synthesis and Gas-Sensing Property of Highly Self-assembled Tungsten Oxide Nanosheets

“…The characterization of speciemen as our previous work (Chen et al, 2013 , 2014 ; Hu et al, 2017b ). The process of measuring the gas sensitivity of the prepared nanomaterials is described in the literature (Guo and Wang, 2016 ).…”

Synthesis of CeO2 nanoparticles with different morphologies and their properties as peroxidase mimic

“…A typical experimental procedure for the fabrication of S‐CeO 2 nanoparticles was as follows . Typically, 2 mmol of Ce(NO 3 ) 3 ·6H 2 O and 4 mmol of PVP were dissolved in 40 mL of purified water.…”