Topological Properties of Titanate Nanotubes

Gao, Tao; Wu, Qixin; Fjellvåg, Helmer; Norby, Poul

doi:10.1021/jp800714s

Cited by 45 publications

(64 citation statements)

References 46 publications

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“…The F KM absorption spectra are shown in figure 3a. As can be seen, a significant red shift in the optical absorption band edge can be observed for the published works [23,24]. Note however that the E g value obtained for the TNT-pH5 sample, 2.81±0.02 eV, is much lower than the E g values of the other two samples, bringing its absorption edge to the near-visible region, in agreement with the above mentioned absorption spectra.…”

Section: Uv-vis Photo-responsesupporting

confidence: 83%

Influence of the sodium/proton replacement on the structural, morphological and photocatalytic properties of titanate nanotubes

Bem

Neves

Nunes

et al. 2012

Journal of Photochemistry and Photobiology A: Chemistry

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Titanate nanotubes (TNT) with different sodium contents have been synthesised using a hydrothermal approach and a swift and highly controllable post-washing processes. The influence of the sodium/proton replacement on the structural and morphological characteristics of the prepared materials was analysed. Different optical behaviour was observed depending on the Na + /H + samples' content. A band gap energy of 3.27±0.03 eV was estimated for the material with higher sodium content while a value of 2.81±0.02 eV was inferred for the most protonated material, which therefore exhibits an absorption edge in the near visible region. The point of zero charge of the materials was determined and the influence of the sodium content on the adsorption of both cationic and anionic organic dyes was studied. The photocatalytic performance of the TNT samples was evaluated in the rhodamine 6G degradation process. Best photodegradation results were obtained when using the most protonated material as catalyst, although this material has shown the lowest R6G adsorption capability.

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Section: Uv-vis Photo-responsesupporting

confidence: 83%

Influence of the sodium/proton replacement on the structural, morphological and photocatalytic properties of titanate nanotubes

Bem

Neves

Nunes

et al. 2012

Journal of Photochemistry and Photobiology A: Chemistry

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“…Due to its favorable physico-chemical properties, it has been widely applied in solar cells, photocatalysts, lithium ion battery electrodes, smart coatings, etc. We refer to the many outstanding reviews already published on such applications for details, and give a brief overview of the most important results below [3,5,29,46,184,[403][404][405][406][407]426,[438][439][440]486]. …”

Section: Applicationsmentioning

confidence: 99%

“…While this is lower than that of other titanates ( $ 3. 4 [46]) it still necessitates UV photons with wavelengths of $ 390 nm or shorter for absorption to occur. In applications such as contaminant removal and disinfection, this may be fine since UV lamps of various geometries, light intensities and spectral windows are commercially available and may be easily installed in reactor setups.…”

Section: Photocatalysismentioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

104

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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“…Fundamentally, 2-butanol (2-BuOH) represents the simplest chiral alcohol and from a practical standpoint it has been shown to interact enantioselectively with catalytically relevant chiral modifiers. [26][27] For example, temperature programmed desorption (TPD) was used to study L-Proline/Pd and α-(1-Naphthyl)ethylamine (NEA)/Pd surfaces when using R-and S-2-BuOH as probes for surface chirality. [26][27] Interestingly, it was found that on the L-Proline/Pd surface, 2-BuOH was regenerated enantioselectively from 2-butoxide decomposition products and preadsorbed deuterium.…”

Section: Introductionmentioning

confidence: 99%

The interplay of covalency, hydrogen bonding, and dispersion leads to a long range chiral network: The example of 2-butanol

Liriano

Carrasco

Lewis

et al. 2016

The Journal of Chemical Physics

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The assembly of complex structures in nature is driven by an interplay between several intermolecular interactions, from strong covalent bonds to weaker dispersion forces. Understanding and ultimately controlling the self-assembly of materials requires extensive study of how these forces drive local nanoscale interactions and how larger structures evolve. Surface-based self-assembly is particularly amenable to modeling and measuring these interactions in well-defined systems. This study focuses on 2-butanol, the simplest aliphatic chiral alcohol. 2-butanol has recently been shown to have interesting properties as a chiral modifier of surface chemistry; however, its mode of action is not fully understood and a microscopic understanding of the role non-covalent interactions play in its adsorption and assembly on surfaces is lacking. In order to probe its surface properties, we employed high-resolution scanning tunneling microscopy and density functional theory (DFT) simulations. We found a surprisingly rich degree of enantiospecific adsorption, association, chiral cluster growth and ultimately long range, highly ordered chiral templating. Firstly, the chiral molecules acquire a second chiral center when adsorbed to the surface via dative bonding of one of the oxygen atom lone pairs. This interaction is controlled via the molecule's intrinsic chiral center leading to monomers of like chirality, at both chiral centers, adsorbed on the surface. The monomers then associate into tetramers via a cyclical network of hydrogen bonds with an opposite chirality at the oxygen atom. The evolution of these square units is surprising given that the underlying surface has a hexagonal symmetry. Our DFT calculations, however, reveal that the tetramers are stable entities that are able to associate with each other by weaker van der Waals interactions and tessellate in an extended square network. This network of homochiral square pores grows to cover the whole Au(111) surface. Our data reveal that the chirality of a simple alcohol can be transferred to its surface binding geometry, drive the directionality of hydrogen-bonded networks and ultimately extended structure. Furthermore, this study provides the first microscopic insight into the surface properties of this important chiral modifier and provides a well-defined system for studying the network's enantioselective interaction with other molecules.

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Topological Properties of Titanate Nanotubes

Cited by 45 publications

References 46 publications

Influence of the sodium/proton replacement on the structural, morphological and photocatalytic properties of titanate nanotubes

Influence of the sodium/proton replacement on the structural, morphological and photocatalytic properties of titanate nanotubes

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

The interplay of covalency, hydrogen bonding, and dispersion leads to a long range chiral network: The example of 2-butanol

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