Quantum size effect in TiO2 nanoparticles prepared by finely controlled metal assembly on dendrimer templates

Satoh, Norifusa; Nakashima, Tsutomu; Kamikura, Kenta; Yamamoto, Kimihisa

doi:10.1038/nnano.2008.2

Cited by 396 publications

(275 citation statements)

References 50 publications

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“…It is a general understanding that smaller size of transitional metal oxide nanoparticles raises the conduction band and lowers the valence band, and results in the observation of a blue shift in the absorption edge, or we called quantum size effect. On the basis of the study by Saton et al 36 , however, the significant quantum size effect can only be observed for the nanoparticles with diameters o2 nm, in the case of TiO 2 . The commonly used transitional metal oxide nanoparticles usually have diameters much larger than 2 nm.…”

Section: Synthesis and Microscopy Characterizations Of 2d Nanosheetsmentioning

confidence: 96%

Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets

et al. 2014

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Two-dimensional (2D) transition metal oxide systems present exotic electronic properties and high specific surface areas, and also demonstrate promising applications ranging from electronics to energy storage. Yet, in contrast to other types of nanostructures, the question as to whether we could assemble 2D nanomaterials with an atomic thickness from molecules in a general way, which may give them some interesting properties such as those of graphene, still remains unresolved. Herein, we report a generalized and fundamental approach to molecular self-assembly synthesis of ultrathin 2D nanosheets of transition metal oxides by rationally employing lamellar reverse micelles. It is worth emphasizing that the synthesized crystallized ultrathin transition metal oxide nanosheets possess confined thickness, high specific surface area and chemically reactive facets, so that they could have promising applications in nanostructured electronics, photonics, sensors, and energy conversion and storage devices.

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Section: Synthesis and Microscopy Characterizations Of 2d Nanosheetsmentioning

confidence: 96%

Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets

et al. 2014

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“…4 The band 65 structure of TiO 2 with different particle sizes has been studied. 18 The results showed that the particle size on the nanoscale raises the conduction band and lowers the valence band. The widened band gap is displayed as a blue shift of the absorbance edge in UV-Vis absorption spectra.…”

Section: Characterizationmentioning

confidence: 99%

Improved photovoltaic performance of dye-sensitized solar cells with modified self-assembling highly ordered mesoporous TiO2 photoanodes

et al. 2012

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Strategies for improving the photovoltaic performance of dye-sensitized solar cells (DSSCs) are proposed by modifying highly transparent and highly ordered multilayer mesoporous TiO2 photoanodes through nitrogen-doping and top-coating with a light-scattering layer. The mesoporous TiO2 photoanodes were fabricated by an evaporation-induced self-assembly method. In regard to the modification methods, the lightscattering layer as a top-coating was proved to be superior to nitrogen-doping in enhancing not only the power conversion efficiency but also the fill factor of DSSCs. The optimized bifunctional photoanode consisted of a 30-layer mesoporous TiO2 thin film (4.15 mm) and a Degussa P25 light-scattering top-layer (4 mm), which gives rise to a similar to 200% higher cell efficiency than for unmodified cells and a fill factor of 0.72. These advantages are attributed to its higher dye adsorption, better light scattering, and faster photon-electron transport. Such a photoanode configuration provides an efficient way to enhance the energy conversion efficiency of DSSCs. Journal Name Strategies for improving the photovoltaic performance of dye-sensitized solar cells (DSSCs) are proposed by modifying highly-transparent and highly-ordered multilayer mesoporous TiO 2 photoanodes through nitrogen-doping and top-coating with a light-scattering layer. The mesoporous TiO 2 photoanodes were fabricated by an evaporation-induced self-assembly method. In regard to the modification methods, the light-scattering layer as a top-coating was proved to be superior to nitrogen-doping in enhancing not only 10 the power conversion efficiency, but also the fill factor of DSSCs. The optimized bifunctional photoanode consisted of a 30-layer mesoporous TiO 2 thin film (4.15 m) and a Degussa P25 light-scattering top-layer (4 m), which gives rise to a ~200% higher cell efficiency than for unmodified cells and a fill factor of 0.72. These advantages are attributed to its higher dye adsorption, better light scattering, and faster photon/electron transport. Such a photoanode configuration provides an efficient way to enhance the 15 energy conversion efficiency of DSSCs.

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“…More recently Yamamoto and co-workers 28 reported the quantum size effect of small titania clusters prepared by the coordination of Ti acac Cl 3 with poly azomethyne dendrimers. We report herein that individual PAMAM dendrimer molecules can act as a template for titania nanoparticles and that the removal of dendrimer templates by calcinations leads to monodispersed hollow nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Hollow Titania Nanoparticles of Single-nanometer Size Using a PAMAM Dendrimer Template

et al. 2013

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Quantum size effect in TiO2 nanoparticles prepared by finely controlled metal assembly on dendrimer templates

Cited by 396 publications

References 50 publications

Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets

Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets

Improved photovoltaic performance of dye-sensitized solar cells with modified self-assembling highly ordered mesoporous TiO2 photoanodes

Preparation of Hollow Titania Nanoparticles of Single-nanometer Size Using a PAMAM Dendrimer Template

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