Dispersion of barium titanate and strontium titanate nanocubes and their selective accumulations

Wada, Satoshi; Nozawa, Ai; Iwatsuki, Shogo; Kuwabara, Tetsuo; Takei, Takahiro; Kumada, Nobuhiro; Půlpán, Petr; Uchida, Hiroshi

doi:10.2109/jcersj2.118.688

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…Unlike the synthesis of simple 0D and 1D nanostructures, the fabrication of more complex nanostructures offers opportunities to explore other unique properties that can potentially lead to the production of new types of nanodevices. However, most low‐temperature synthesis routes result in the formation of spherical and cubic BaTiO 3 nanocrystals with a cubic crystal structure 51, 77–82. Complex nanostructures of assembled BaTiO 3 nanocrystals are difficult to obtain because of the isotropy of the cubic crystal structure.…”

Section: Current Status and Challenges In Nanodielectricsmentioning

confidence: 99%

“…Thus, the development of a simple, effective, and economical process for the direct synthesis of desirable perovskite architectures is of great importance but remains a key research challenge. In this context, a potentially interesting route is DNA‐assisted assembly, through which mosaic‐like superlattice assemblies of BaTiO 3 /SrTiO 3 nanocubes are formed 80, 81. However, these architectures are too small to use in device applications.…”

Section: Current Status and Challenges In Nanodielectricsmentioning

confidence: 99%

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Two‐Dimensional Dielectric Nanosheets: Novel Nanoelectronics From Nanocrystal Building Blocks

2011

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Two-dimensional (2D) nanosheets, which possess atomic or molecular thickness and infinite planar lengths, are regarded as the thinnest functional nanomaterials. The recent development of methods for manipulating graphene (carbon nanosheet) has provided new possibilities and applications for 2D systems; many amazing functionalities such as high electron mobility and quantum Hall effects have been discovered. However, graphene is a conductor, and electronic technology also requires insulators, which are essential for many devices such as memories, capacitors, and gate dielectrics. Along with graphene, inorganic nanosheets have thus increasingly attracted fundamental research interest because they have the potential to be used as dielectric alternatives in next-generation nanoelectronics. Here, we review the progress made in the properties of dielectric nanosheets, highlighting emerging functionalities in electronic applications. We also present a perspective on the advantages offered by this class of materials for future nanoelectronics.

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Section: Current Status and Challenges In Nanodielectricsmentioning

confidence: 99%

Section: Current Status and Challenges In Nanodielectricsmentioning

confidence: 99%

Two‐Dimensional Dielectric Nanosheets: Novel Nanoelectronics From Nanocrystal Building Blocks

2011

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“…The "bottom-up" process from nano-sized materials is a key engineering to achieve these demands. 3 The assembled and ordered structure prepared from nanocrystallites building blocks is well-known as one of the bottom-up processes. These assemblies have lots of advantages such as high surface area, quantum size effect, and utilization of specific properties which depend on the shape of the nanocrystals as well as the configuration of the nanocrystals assembled structure.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Dielectric Nanocubes in Ordered Structure by Capillary Force Assisted Self-Assembly Method and Their Piezoresponse Properties

Mimura¹,

Dang²,

Kato³

et al. 2012

j. nanosci. nanotech.

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Ordered structures of barium titanate (BT) nanocubes, strontium titanate (ST) nanocubes and BT/ST nanocubes mixture were directly fabricated on Si and Pt-coated Si substrates using a capillary force assisted assembly method. The morphology of self-assembled structures was observed using field emission scanning electron microscopy (FE-SEM) and scanning probe microscopy (SPM). It was revealed that nanocubes were arranged with various degrees of ordering to develop multilayer and monolayer regions at the surface of substrates. The elemental mapping of the structure consisting of the nanocubes mixture was also investigated by transmission electron microscopy (TEM) with an energy dispersive X-ray spectroscopy (EDX). It was revealed that BT and ST nanocubes coexisted homogeneously in the structure and had possibility to be arranged in order to each other. The piezoresponse properties obtained by scanning probe microscopy (SPM) indicated that the hetero-interface between BT and ST nanocubes would introduce anomaly in piezoelectric properties.

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“…Therefore, a ''bottom-up'' process from nanosized materials is required as a key engineering technique to satisfy these demands. 4) The assembly and ordering of nanocrystals such as building blocks constitute one of the bottom-up processes. These assemblies of nanocrystals have several advantages such as the high surface area, quantum size effect, and utilization of specific properties which depend on the shape of nanocrystals as well as on the configuration of the nanocrystal assembled structure.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Dielectric Nanocubes Ordered Structures Fabricated by Solution Self-Assembly Process

Mimura

Dang

Kato

et al. 2011

Jpn. J. Appl. Phys.

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Ordered structures of barium titanate (BT) nanocubes, strontium titanate (ST) nanocubes and BT–ST nanocube mixture were directly fabricated on Si and Pt-coated Si substrates using a colloidal solution assembly method inspired by convection self-assembly. BT/ST alternating layered structure was also fabricated by repeating the self-assembly process several times. The microstructure of the self-assembled structures was observed using field emission scanning electron microscopy (FE-SEM) and scanning probe microscopy (SPM). It was revealed that nanocubes were arranged with various degrees of ordering to develop monolayer regions at the surface of the substrates. The crystallographic phase and orientation of the assembly consisting of BT and ST nanocubes were evaluated by X-ray diffraction analysis. The (100) and (200) diffractions of BT and ST were observed and no other diffractions were observed. The BT and ST nanocubes had a 100 face and were arrayed orderly with their faces parallel to the surface of the substrates. The piezoresponse properties obtained by scanning probe microscopy (SPM) indicated that the heterointerface between BT and ST nanocubes would introduce an anomaly in piezoelectric properties.

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Dispersion of barium titanate and strontium titanate nanocubes and their selective accumulations

Cited by 5 publications

References 12 publications

Two‐Dimensional Dielectric Nanosheets: Novel Nanoelectronics From Nanocrystal Building Blocks

Two‐Dimensional Dielectric Nanosheets: Novel Nanoelectronics From Nanocrystal Building Blocks

Fabrication of Dielectric Nanocubes in Ordered Structure by Capillary Force Assisted Self-Assembly Method and Their Piezoresponse Properties

Characterization of Dielectric Nanocubes Ordered Structures Fabricated by Solution Self-Assembly Process

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