Novel Crystal Growth from a Two-Dimensionally Bound Nanoscopic System. Formation of Oriented Anatase Nanocrystals from Titania Nanosheets

Fukuda, Katsutoshi; Sasaki, Takayoshi; Watanabe, Mamoru; Nakai, Izumi; Omote, Kazuhiko

doi:10.1021/cg025619m

Cited by 31 publications

(34 citation statements)

References 30 publications

(44 reference statements)

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“…11 The final product at 900°C from the film of smallsized nanosheets contained a small amount of rutile and nonoriented anatase phase, which was not the case for the film in the present study. This may be a consequence of the mean film quality with a substantial amount of overlapped area.…”

Section: Resultscontrasting

confidence: 59%

Unusual Crystallization Behaviors of Anatase Nanocrystallites from a Molecularly Thin Titania Nanosheet and Its Stacked Forms: Increase in Nucleation Temperature and Oriented Growth

et al. 2006

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Crystallization behaviors of anatase nanocrystallites from an ultrathin two-dimensional reactant composed of exfoliated titania nanosheets have been studied by monitoring the heating process of their well-organized films, with which the film thickness can be controlled from a molecularly thin monolayer to a stacked multilayer structure with a stepwise increment of approximately 1 nm. The heated products were identified by means of total reflection fluorescence X-ray absorption near-edge structure analysis and in-plane X-ray diffraction measurements using a synchrotron radiation source. The films composed of five or more layers of stacked nanosheets were transformed into anatase at 400-500 degrees C, which is a normal crystallization temperature of anatase from bulk reactants. As the film became thinner by decreasing the number of nanosheet layers to five or less, the crystallization temperature was found to increase and finally reached 800 degrees C for the monolayer film. Interestingly, preferential growth of anatase along the c-axis was strongly promoted for these ultrathin films. These unusual behaviors may be understood in terms of crystallization from the two-dimensional system of scarcely distributed reactants. The titania nanosheet crystallite is much thinner than the unit cell dimensions of anatase, and therefore, extensive atomic diffusion is required for the transformation particularly for the ultrathin films with a critical number (2-3) of stacked nanosheet layers. There is some structural similarity between anatase and titania nanosheet, which may account for the oriented growth of anatase nanocrystallites.

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Section: Resultscontrasting

confidence: 59%

Unusual Crystallization Behaviors of Anatase Nanocrystallites from a Molecularly Thin Titania Nanosheet and Its Stacked Forms: Increase in Nucleation Temperature and Oriented Growth

et al. 2006

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“…The texture design of Ti-based materials has been intensively studied and developed using several different strategies, including sol-gel, hydrothermal, micelle and inverse micelle usage, solvothermal, direct oxidation, electrodeposition, chemical/physical vapor deposition, emulsion or hydrolysis precipitation, ultrasonic, and microwave approaches [1]. Up to now, a variety of titanate and titania-based materials have been successfully synthesized, including nanorods, nanotubes, nanofibers, nanosheets, nanowires, nanobelts, nanoflowers, nanoleaves, nanospheres, and nanoneedles [3][4][5][6][7][8][9][10]. Hydrothermal processing has been widely applied in the preparation of TiO 2 nanomaterials; thus, their textures have been controlled by several variables, for example, precursors, pH, reaction temperature, aging duration, water pressure, and solvent characteristics [2,11].…”

Section: Introductionmentioning

confidence: 99%

A simple hydrothermal preparation of TiO2 nanomaterials using concentrated hydrochloric acid

Nguyen‐Phan

Pham

Cường

et al. 2009

Journal of Crystal Growth

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“…Surface science tools can then be applied to investigate their structural properties on the atomic scale. Moreover, DFT calculations reveal that a lepidocrocite nanosheet can be thought of as deriving from an anatase (001) bilayer through a simple structural rearrangement, thereby shedding some light into the lepidocrocite-anatase structural transition observed in some experiments [7,11].…”

mentioning

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Bottom-Up Assembly of Single-Domain Titania Nanosheets on(1×2)−Pt(110)

et al. 2006

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A bottom-up route towards the synthesis of titania nanosheets is explored, alternative to the exfoliation of layered titanates. Nanosheets are assembled from the constituent elements and epitaxially matched to a suitable substrate: (1 x 2)-Pt(110). Their basic lepidocrocite structure is modulated at the nanoscale due to coincidence with the substrate. Density functional calculations reveal the structure details of the nanosheet, which is also shown to be in close relationship with a (001)-oriented anatase bilayer.

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Novel Crystal Growth from a Two-Dimensionally Bound Nanoscopic System. Formation of Oriented Anatase Nanocrystals from Titania Nanosheets

Cited by 31 publications

References 30 publications

Unusual Crystallization Behaviors of Anatase Nanocrystallites from a Molecularly Thin Titania Nanosheet and Its Stacked Forms: Increase in Nucleation Temperature and Oriented Growth

Unusual Crystallization Behaviors of Anatase Nanocrystallites from a Molecularly Thin Titania Nanosheet and Its Stacked Forms: Increase in Nucleation Temperature and Oriented Growth

A simple hydrothermal preparation of TiO2 nanomaterials using concentrated hydrochloric acid

Bottom-Up Assembly of Single-Domain Titania Nanosheets on(1×2)−Pt(110)

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