Synthesis of CeO2@SiO2 core–shell nanoparticles by water-in-oil microemulsion. Preparation of functional thin film

Grasset, Fabien; Marchand, R.; Marie, A. M.; Fauchadour, D.; Fajardie, Franck

doi:10.1016/j.jcis.2006.02.028

Cited by 56 publications

(33 citation statements)

References 36 publications

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“…As reported in our previous work, the use of aqueous colloidal sols exhibiting excellent dye dispersion constitutes the key to obtaining monodisperse functional @SiO 2 nanoparticles. [13,14] This key point was confirmed by DLS measurements as seen in Figure 3. The mean hydrodynamic diameter is 2.5 nm for the Cs 2 Mo 6 Br 14 acidic sol, which agrees with the crystallographic cluster unit size (1.1 nm).…”

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confidence: 57%

“…In accordance with previous publications, it is assumed that the main part of the TEOS monomeric species was completely hydrolyzed after 48 h and, consequently, had already migrated into the droplets for condensation and formation of SiO 2 . [13,14] Indeed, although TEOS is an organophilic molecule, which, therefore, is more readily dissolved in heptane than in aqueous droplets, we explain the condensation of TEOS by the fact that the hydrolysis of TEOS is first catalyzed by the acid sol initially present in the droplets. Indeed, the Si(OC 2 H 5 ) groups are protonated under such conditions, making alcohol a better leaving group, and therefore increasing the speed of hydrolysis.…”

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confidence: 99%

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Water‐in‐Oil Microemulsion Preparation and Characterization of Cs₂[Mo₆X₁₄]@SiO₂ Phosphor Nanoparticles Based on Transition Metal Clusters (X = Cl, Br, and I)

et al. 2007

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Much research has been devoted to molybdenum octahedral clusters Mo 6 since the discovery of the A x Mo 6 Y 8 solidstate series (Y = S, Se, Te) in the early 1970s.[1] Indeed, their interesting physical properties and potential applicationse.g., superconductivity at high critical field, thermoelectric, catalysis, or redox intercalation processes -have stimulated the research of many groups. [2] (Fig. 1). The physical properties of Mo 6 solid-state compounds are related to the number of electrons available for metal-metal bonding within the cluster (valence electron count, VEC) and to the strength of interaction between the units. Mo-centered electrons are located on twelve metal-metal bonding molecular orbitals of the molecular orbital diagram. Their full occupation leads to a closed-shell configuration with a VEC of 24.[ [8,9] that can be used for the formation and organization of supramolecular assemblies as well as hybrid materials. Hybrids can be synthesized either by the grafting of functional donor ligands in apical position or through the association of anionic cluster units with organic or organometallic cations by cation metathesis or electrochemical techniques.[10]The large emission region of the [Mo 6 X 14 ] 2-anion in the red and near infrared (580-900 nm) is particularly interesting for biotechnology applications as it is selectively transmitted through tissues owing to the relatively low absorption at these wavelengths.[11] Anionic Mo 6 cluster units are usually associated with alkali counter cations within inorganic solids. Indeed, the use of inorganic cluster compounds as luminescent dyes, for instance in bio-imaging strategies, presupposes that both clusters and counter cations are embedded in an inert matrix in order to avoid ionic diffusion, oxidization of the cluster, or apical ligand exchanges in aqueous media, which will precipitate the cluster as a hydroxo species.

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Water‐in‐Oil Microemulsion Preparation and Characterization of Cs₂[Mo₆X₁₄]@SiO₂ Phosphor Nanoparticles Based on Transition Metal Clusters (X = Cl, Br, and I)

et al. 2007

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“…The next step in the process is the destruction of the evolved gel, thus, resulting in the formation of nanocrystalline material [16]. The sol-gel process is widely used for manufacturing nanoparticles of different metal oxide materials like SnO 2 [17,18], TiO 2 [19], ZnO [20,21], and SiO 2 [22]. Amongst various methods, sol-gel process is a relatively novel process for the preparation of functional material that needs precise microstructural control in order to satisfy desired properties [23].…”

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Effect of Sintering Temperatures on the Synthesis of SnO2 Nanospheres

Pawar

Pinjari

Kolekar

et al. 2012

ISRN Chemical Engineering

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In this communication we report the rapid nanostructure of SnO 2 with a spherical morphology which has been prepared in large scale via sol-gel method. The products were characterized with scanning electron microscopy, X-ray powder diffraction, transmission electron microscopy, FTIR, and photoluminescence spectroscopy. The strong photoluminescence of the nanosphere in visible region suggested possible application in nanoscaled optoelectronic devices. A possible growth mechanism for the SnO 2 nanosphere in terms of solvation, hydrolysis, and polymerization was proposed.

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“…This indicates that CeO 2 in CS and CS-MnCP exists with cubic fluorite structure. However, there is no SiO 2 peak to find on the XRD patterns of CS and CS-MnCP, which is due to the amorphous nature of the SiO 2 particles [25]. Moreover, there is no new phase to detect.…”

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Immobilization of metalloporphyrins on CeO2@SiO2 with a core-shell structure prepared via microemulsion method for catalytic oxidation of ethylbenzene

Shen

et al. 2015

J. Cent. South Univ.

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CeO 2 @SiO 2 core−shell nanoparticles were prepared by microemulsion method, and metalloporphyrins were immobilized on the CeO 2 @SiO 2 core−shell nanoparticles surface via amide bond. The supported metalloporphyrin catalysts were characterized by N 2 adsorption−desorption isotherm (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet and visible spectroscopy (UV-Vis), and Fourier transform infrared spectroscopy (FT-IR). The results show that the morphology of CeO 2 @SiO 2 nanoparticles is core−shell microspheres with about 30 nm in diameter, and metalloporphyrins are immobilized on the CeO 2 @SiO 2 core−shell nanoparticles via amide bond. Especially, the core−shell structure contains multi CeO 2 core and thin SiO 2 shell, which may benefit the synergistic effect between the CeO 2 core and the porphyrin anchored on the very thin SiO 2 shell. As a result, this supported metalloporphyrin catalysts present comparably high catalytic activity and stability for oxidation of ethylbenzene with molecular oxygen, namely, ethylbenzene conversion remains around 12% with identical selectivity of about 80% for acetophenone even after six-times reuse of the catalyst.

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Synthesis of CeO2@SiO2 core–shell nanoparticles by water-in-oil microemulsion. Preparation of functional thin film

Cited by 56 publications

References 36 publications

Water‐in‐Oil Microemulsion Preparation and Characterization of Cs₂[Mo₆X₁₄]@SiO₂ Phosphor Nanoparticles Based on Transition Metal Clusters (X = Cl, Br, and I)

Water‐in‐Oil Microemulsion Preparation and Characterization of Cs₂[Mo₆X₁₄]@SiO₂ Phosphor Nanoparticles Based on Transition Metal Clusters (X = Cl, Br, and I)

Effect of Sintering Temperatures on the Synthesis of SnO2 Nanospheres

Immobilization of metalloporphyrins on CeO2@SiO2 with a core-shell structure prepared via microemulsion method for catalytic oxidation of ethylbenzene

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Synthesis of CeO2@SiO2 core–shell nanoparticles by water-in-oil microemulsion. Preparation of functional thin film

Cited by 56 publications

References 36 publications

Water‐in‐Oil Microemulsion Preparation and Characterization of Cs2[Mo6X14]@SiO2 Phosphor Nanoparticles Based on Transition Metal Clusters (X = Cl, Br, and I)

Water‐in‐Oil Microemulsion Preparation and Characterization of Cs2[Mo6X14]@SiO2 Phosphor Nanoparticles Based on Transition Metal Clusters (X = Cl, Br, and I)

Effect of Sintering Temperatures on the Synthesis of SnO2 Nanospheres

Immobilization of metalloporphyrins on CeO2@SiO2 with a core-shell structure prepared via microemulsion method for catalytic oxidation of ethylbenzene

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Water‐in‐Oil Microemulsion Preparation and Characterization of Cs₂[Mo₆X₁₄]@SiO₂ Phosphor Nanoparticles Based on Transition Metal Clusters (X = Cl, Br, and I)

Water‐in‐Oil Microemulsion Preparation and Characterization of Cs₂[Mo₆X₁₄]@SiO₂ Phosphor Nanoparticles Based on Transition Metal Clusters (X = Cl, Br, and I)