Titania‐Based Hybrid Materials: From Molecular Precursors to the Controlled Design of Hierarchical Hybrid Materials

Rozes, Laurence; D'Arras, Loïc; Hoffman, Chloé; Potier, François; Halttunen, Niki; Nicole, Lionel

doi:10.1002/9781118870068.ch4

Cited by 2 publications

(2 citation statements)

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“…The differences result from a combination of several effects, since the growth and the functionalization of the nanoparticles occur simultaneously. The nucleation of the TiO 2 nanoparticles is most likely to occur first due to the much higher reactivity of titanium alkoxides compared to their silicon counterparts in aqueous media . After nucleation, as the binding energy of APTES is large and positive (>1.3 eV) for all facets (Table ), aminosilanes probably adsorb regardless of facet.…”

Section: Discussionmentioning

confidence: 99%

Controlling Oriented Attachment and in Situ Functionalization of TiO₂ Nanoparticles During Hydrothermal Synthesis with APTES

et al. 2017

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Understanding growth mechanisms and the role of surface functionalization is of key importance to control shape and morphology of nanoparticles and their properties. Here, we describe the growth mechanism and the effect of hydrothermal synthesis parameters (pH, time and precursor/functionalization agent ratio) during in situ functionalization of anatase TiO2 nanoparticles with 3-aminopropyltriethoxysilane. Elongated crystallographically oriented TiO2 nanoparticles were formed by oriented attachment mechanism in addition to spherical nanoparticles. The growth mechanism is determined by a combination of ex situ techniques such as high-resolution transmission electron microscopy combined with in situ synchrotron X-ray diffraction and density functional theory calculations. Oriented attachment induced by the functionalization agent is shown to be the origin of the elongation of the nanoparticles, as only spherical nanoparticles were formed in the absence of surface functionalization. Finally, it was shown that the amount and the size of the elongated nanoparticles can be tuned by adjusting pH.

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Section: Discussionmentioning

confidence: 99%

Controlling Oriented Attachment and in Situ Functionalization of TiO₂ Nanoparticles During Hydrothermal Synthesis with APTES

et al. 2017

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“…However, contrary to the silica precursors, the titanium is much more sensitive to the environment because of (i) its stronger electrophile character and (ii) its coordination number which is superior to its valence, making nucleophilic addition reactions possible when coordination of the metal is not complete [25]. Consequently, this metal center is very sensitive to reaction with ambient H2O.…”

Section: Introductionmentioning

confidence: 99%

Microfabrication by two-photon lithography, and characterization, of SiO2/TiO2 based hybrid and ceramic microstructures

Desponds,

Banyasz,

Montagnac

et al. 2020

J Sol-Gel Sci Technol

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High resolution fabrication using two-photon lithography is extensively studied for a large range of materials, from polymer to inorganics. Hybrid materials including a sol-gel step have been developed since two decades to increase mechanical or optical properties in particular on silicon based materials. Among the metal oxide, few studies have been dedicated to titanium and, because of the high reactivity of titanium precursors, obtaining a resin with a high part of titanium is challenging. Indeed, resins for two-photon lithography have to be stable for the processing time and titanium precursors are more difficult to operate due to their higher reactivity and often require drastic working conditions in order to control the chemical processes. Here, we propose a method, working at ambient conditions, to print submicronic structures of organicinorganic hybrids with a large proportion of titanium and ceramics using high resolution twophoton process. The material obtained and its evolution during the pyrolysis at 600°C and 1000°C are characterized. We show that TiO2/SiO2 based micro-ceramics can be obtained after the pyrolysis of the microstructures. The respective roles of the two chemical reactions involved in this lithography process, sol-gel condensation and radical photopolymerization, are highlighted.

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Titania‐Based Hybrid Materials: From Molecular Precursors to the Controlled Design of Hierarchical Hybrid Materials

Cited by 2 publications

References 208 publications

Controlling Oriented Attachment and in Situ Functionalization of TiO₂ Nanoparticles During Hydrothermal Synthesis with APTES

Controlling Oriented Attachment and in Situ Functionalization of TiO₂ Nanoparticles During Hydrothermal Synthesis with APTES

Microfabrication by two-photon lithography, and characterization, of SiO2/TiO2 based hybrid and ceramic microstructures

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Titania‐Based Hybrid Materials: From Molecular Precursors to the Controlled Design of Hierarchical Hybrid Materials

Cited by 2 publications

References 208 publications

Controlling Oriented Attachment and in Situ Functionalization of TiO2 Nanoparticles During Hydrothermal Synthesis with APTES

Controlling Oriented Attachment and in Situ Functionalization of TiO2 Nanoparticles During Hydrothermal Synthesis with APTES

Microfabrication by two-photon lithography, and characterization, of SiO2/TiO2 based hybrid and ceramic microstructures

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Product

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Controlling Oriented Attachment and in Situ Functionalization of TiO₂ Nanoparticles During Hydrothermal Synthesis with APTES

Controlling Oriented Attachment and in Situ Functionalization of TiO₂ Nanoparticles During Hydrothermal Synthesis with APTES