Towards flexible inorganic “mesomaterials”: one-pot low temperature synthesis of mesostructured nanocrystalline titania

Haseloh, Sönke; Choi, Sung Yeun; Mamak, Marc; Coombs, Neil; Petrov, Srebri; Chopra, Naveen; Ozin, Geoffrey A.

doi:10.1039/b403607g

Cited by 59 publications

(47 citation statements)

References 10 publications

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“…23 Since the electro-and magnetomechanical interaction coefficients d 13 PZT Ͼ 0 and s CFO Ͻ 0 an electric field, E 1 , applied perpendicularly to the axis of the CFO cylinders, will reduce their average magnetization, as can be verified in Fig. 3͑b͒.…”

mentioning

confidence: 81%

“…11,12 Poly͑ethylene oxide͒ ͑PEO͒ is widely used as the hydrophilic part of copolymers combining it with other hydrophobic polymers into diblock or triblock molecular architectures. Inorganic precursors other than silica have been also used for this coassembly approach: titania, 13,14 niobium oxide, 15 silicon carbonitrides, 16 and silsesquioxanes. 17,18 Many of these efforts have been reviewed recently.…”

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confidence: 99%

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Diblock copolymer based self-assembled nanomagnetoelectric

Ren

Briber

Wuttig

2008

Applied Physics Letters

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A magnetoelectric ͑ME͒ composite with controlled nanostructures is synthesized using coassembly of two inorganic precursors with a block copolymer. This solution processed material consists of hexagonally arranged ferromagnetic cobalt ferrite ͓CoFe 2 O 4 ͑CFO͔͒ nano cylinders within a matrix of ferroelectric lead zirconium titanate ͓Pb 1.1 ͑Zr 0.53 Ti 0.47 ͒O 3 ͑PZT͔͒ when thin films were prepared by spin coating. The initial magnetic permeability of the self-assembled CFO/PZT nanocomposite changes by a factor of 5 through the application of 2.5 V. This work also demonstrates that a block copolymer can be used to simultaneously template two compound inorganic phases to form a nanoscale composite.

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confidence: 81%

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confidence: 99%

Diblock copolymer based self-assembled nanomagnetoelectric

Ren

Briber

Wuttig

2008

Applied Physics Letters

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“…HAuCl 4 is reduced simul- taneously into metallic Au during this irradiation process. 33,37 It should be noted that arrays of composite nanoparticles could be obtained only from hybrid micellar films of PS-b-PEO/HAuCl 4 /SG of the order of one monolayer thickness because the inorganic domains in thicker films (e.g. 48 nm), which do not form cylinders perpendicular to the substrate surface, collapse to form irregular arrays after matrix removal.…”

Section: Resultsmentioning

confidence: 99%

Au/Titania Composite Nanoparticle Arrays with Controlled Size and Spacing by Organic-Inorganic Nanohybridization in Thin Film Block Copolymer Templates

Steinhart

Kim

et al. 2007

Bulletin of the Korean Chemical Society

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A simple approach to prepare arrays of Au/TiO 2 composite nanoparticles by using Au-loaded block copolymers as templates combined with a sol-gel process is described. The organic-inorganic hybrid films with closely packed inorganic nanodomains in organic matrix are produced by spin coating the mixtures of polystyrene-block-poly(ethylene oxide) (PS-b-PEO)/HAuCl 4 solution and sol-gel precursor solution. After removal of the organic matrix with deep UV irradiation, arrays of Au/TiO 2 composite nanoparticles with different compositions or particle sizes can be easily produced. Different photoluminescence (PL) emission spectra from an organic-inorganic hybrid film and arrays of Au/TiO 2 composite nanoparticles indicate that TiO 2 and Au components exist as separate state in the initial hybrid film and form composite nanoparticles after the removal of the block copolymer matrix.

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“…A highly humid environment is important during the aging of these films to slow down the evaporation of the water from the films (to provide sufficient time for reorientation and ordering of the mesostructure) and to permit the mesoscopic ordering of the surfactant [95,97,[125][126][127]. Crepaldi et al [58] provided a thorough discussion of the complete synthesis and characterization procedures to obtain ordered mp-TiO 2 films.…”

Section: Surfactant/titania Film Agingmentioning

confidence: 99%

“…In order to inhibit rapid olation and condensation of the titania precursors to allow self-assembly to occur, protons (H + ions) have been used as inhibitors [88]. Although ligands such as acetylacetonate can also be used to reduce the reactivity of metal alkoxides, they can interfere in the interactions between titanium species and surfactants, so H + is a more widely used inhibitor in the synthesis of surfactant templated mp-TiO 2 films [94][95][96][97]. Using a highly acidic sol prevents uncontrolled condensation of transition metal precursors, which allows slow formation of the inorganic network within the liquid crystal mesophase formed after coating.…”

Section: Titanium Precursor Chemistrymentioning

confidence: 99%

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

et al. 2017

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Mesoporous titania (mp-TiO 2 ) has drawn tremendous attention for a diverse set of applications due to its high surface area, interfacial structure, and tunable combination of pore size, pore orientation, wall thickness, and pore connectivity. Its pore structure facilitates rapid diffusion of reactants and charge carriers to the photocatalytically active interface of TiO 2 . However, because the large band gap of TiO 2 limits its ability to utilize visible light, non-metal doping has been extensively studied to tune the energy levels of TiO 2 . While first-principles calculations support the efficacy of this approach, it is challenging to efficiently introduce active non-metal dopants into the lattice of TiO 2 . This review surveys recent advances in the preparation of mp-TiO 2 and their doping with non-metal atoms. Different doping strategies and dopant sources are discussed. Further, co-doping with combinations of non-metal dopants are discussed as strategies to reduce the band gap, improve photogenerated charge separation, and enhance visible light absorption. The improvements resulting from each doping strategy are discussed in light of potential changes in mesoporous architecture, dopant composition and chemical state, extent of band gap reduction, and improvement in photocatalytic activities. Finally, potential applications of non-metal-doped mp-TiO 2 are explored in water splitting, CO 2 reduction, and environmental remediation with visible light.

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Towards flexible inorganic “mesomaterials”: one-pot low temperature synthesis of mesostructured nanocrystalline titania

Cited by 59 publications

References 10 publications

Diblock copolymer based self-assembled nanomagnetoelectric

Diblock copolymer based self-assembled nanomagnetoelectric

Au/Titania Composite Nanoparticle Arrays with Controlled Size and Spacing by Organic-Inorganic Nanohybridization in Thin Film Block Copolymer Templates

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

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