Hydrothermal synthesis of CeO2 nano-particles

Tok, Alfred Iing Yoong; Boey, Freddy Yin Chiang; Dong, Zhili; Sun, Xuzhuo

doi:10.1016/j.jmatprotec.2007.02.042

Cited by 232 publications

(95 citation statements)

References 12 publications

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“…In the literature, numerous studies on understanding the effect of pH on ceria particles size and shape have been conducted, however, depending on the synthesis method and choice of ceria precursor, different results have been reported. Tok et al [50] observed similar behavior where smaller grains were seen in a more basic environment. This was because the Ce(OH)4 precipitate is basic; thus, the solubility of Ce(OH)4 in a more basic medium limits further agglomeration to form larger particles [50].…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 69%

“…Tok et al [50] observed similar behavior where smaller grains were seen in a more basic environment. This was because the Ce(OH)4 precipitate is basic; thus, the solubility of Ce(OH)4 in a more basic medium limits further agglomeration to form larger particles [50]. However, an opposite trend was reported by Yang and coworkers [51], where changing the concentration of NaOH from 1 M to 5 M, increased the particle size of the ceria cubes from 20 nm to 25-40 nm.…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 69%

“…In order to understand the formation of ceria nanorods under microgravitiy condition, two crystal growth processes, Oswald ripening and oriented attachment, can be considered. These crystal growth mechanisms have been utilized to demonstrate the increase in particle size and change in morphology of the ceria particles [50][51][52]. The Ostwald ripening process follows the dissolution and reprecipitation of solution ions (Ce 4+ , OH − ) from the ceria nuclei minimizing the surface energy state [53].…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

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Effect of Microgravity on Synthesis of Nano Ceria

et al. 2015

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Cerium oxide (CeO2) was prepared using a controlled-precipitation method under microgravity at the International Space Station (ISS). For comparison, ceria was also synthesized under normal-gravity conditions (referred as control). The Brunauer-Emmett-Teller (BET) surface area, pore volume and pore size analysis results indicated that the ceria particles grown in space had lower surface area and pore volume compared to the control samples. Furthermore, the space samples had a broader pore size distribution ranging from 30-600 Å, whereas the control samples consisted of pore sizes from 30-50 Å range. Structural information of the ceria particles were obtained using TEM and XRD. Based on the TEM images, it was confirmed that the space samples were predominantly nano-rods, on the other hand, only nano-polyhedra particles were seen in the control ceria samples. The average particle size was larger for ceria samples synthesized in space. XRD results showed higher crystallinity as well as larger mean crystal size for the space samples. The effect of sodium hydroxide concentration on synthesis of ceria was also examined using 1 M and 3 M solutions. It was found that the control samples, prepared in 1 M and 3 M sodium hydroxide solutions, did not show a significant difference between the two. However, when the ceria samples were prepared OPEN ACCESSCatalysts 2015, 5 1307 in a more basic medium (3 M) under microgravity, a decrease in the particle size of the nano-rods and appearances of nano-polyhedra and spheres were observed.

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Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 69%

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 69%

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

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Effect of Microgravity on Synthesis of Nano Ceria

et al. 2015

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“…The Ce 3+ would be oxidized to Ce 4+ in a higher pH value solution 18) , i.e. Ce 3+ + H 2 O → ⋄Ce(OH) 3+ + H + + e − with subsequent hydrolysis to Ce(OH) 4 and precipitation.…”

Section: Resultsmentioning

confidence: 99%

The Synthesis, Characterization and Optical Properties of Nanocrystallined Cerium Dioxide by the Hydrothermal Method

2017

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Nano-sized cerium dioxides (CeO 2 ) are prepared by the hydrothermal method, using nitric cerium. The XRD study shows that nano-sized CeO 2 has an appreciable amount of cubic phase. The nano-sized CeO 2 obtained has an average particle size in the range of 4.5-10.3 nm. TEM micrographs show well-dispersed spherical-like and cubic-like CeO 2 nanoparticles. The UV-DRS absorption spectrum for alkali-treated CeO 2 shows an absorption peak at 365 384 nm.

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“…[1] CeO 2 is an important rare earth oxide having a wide band gap and stable cubic fluorite structure. It is a highly reactive rare earth metal oxide that is used in various fields such as catalysis, polishing materials, luminescence, optical additive, ultraviolet (UV)-adsorbents, hydrogen storage materials, oxygen sensors, solid oxide fuel cells, [2][3][4][5][6][7][8][9][10][11] ionic conduction, and as counterelectrodes for electrochromic devices.…”

Section: Rare Earth Oxide Nanostructures Have Extraordi-mentioning

confidence: 99%

Mg Doping Induced Effects on Structural, Optical, and Electrical Properties as Well as Cytotoxicity of CeO2 Nanostructures

Iqbal

Jan

Awan³

et al. 2016

Metall Mater Trans B

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Here, Mg x Ce 1Àx O 2 (where x = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) nanostructures have been successfully synthesized by using a simple, easy, and cost-effective soft chemical method. X-ray diffraction (XRD) patterns substantiate the single-phase formation of a CeO 2 cubic fluorite structure for all samples. Infrared spectroscopy results depict the presence of peaks only related to Ce-O bonding, which confirms the XRD results. It has been observed via ultraviolet (UV)-visible spectroscopy that Mg doping has tuned the optical band gap of CeO 2 significantly. The electrical conductivity of CeO 2 nanostructures has been found to increase with Mg doping, which is attributed to enhancement in carrier concentration due to the different valance states of dopant and host ions. Selective cytotoxic behavior of Mg x Ce 1Àx O 2 nanostructures has been determined for neuroblastoma (SH-SY5Y) cancerous and HEK-293 healthy cells. Both doped and undoped CeO 2 nanostructures have been found to be toxic for cancer cells and safe toward healthy cells. This selective toxic behavior of the synthesized nanostructures has been assigned to the different levels of reactive oxygen species (ROS) generation in different types of cells. This makes the synthesized nanostructures a potential option for cancer therapy in the near future.

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Hydrothermal synthesis of CeO2 nano-particles

Cited by 232 publications

References 12 publications

Effect of Microgravity on Synthesis of Nano Ceria

Effect of Microgravity on Synthesis of Nano Ceria

The Synthesis, Characterization and Optical Properties of Nanocrystallined Cerium Dioxide by the Hydrothermal Method

Mg Doping Induced Effects on Structural, Optical, and Electrical Properties as Well as Cytotoxicity of CeO2 Nanostructures

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