Structural control on crystal growth of titanate in aqueous system: Selective production of nanostructures of layered titanate and anatase-type titania

Yoko Takezawa, Hiroaki Imai

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Layered titanate nanosheets and anatase-type titania nanospines were selectively grown from a molecular titanium precursor, TiF4, by a reaction with various cationic species in an agar gel matrix. A layered structure of the titanate was fundamentally produced by the assembly of anionic titanate species with a certain amount of specific cations under a basic condition. Nanoscale flaky and rodlike forms were constructed from the titanate monolayers with sodium and ammonium ions, respectively. On the other hand, anatase-type crystalline titania was formed from TiF4 under an acidic condition or in the absence of a sufficient amount of the cationic species. Especially, a spherical architecture of anatase nanospines was produced through a moderate reaction with ammonia provided by decomposition of urea. The role of the counter cations was essential for the selection of the crystal structures and the construction of the particular rodlike and flaky forms of the layered titanates.

Original languageEnglish
Pages (from-to)117-121
Number of pages5
JournalJournal of Crystal Growth
Volume308
Issue number1
DOIs
Publication statusPublished - 2007 Oct 1

Fingerprint

Crystallization
Crystal growth
anatase
Titanium dioxide
crystal growth
Nanostructures
titanium
Titanium
Positive ions
titanates
cations
Nanosheets
Cations
ureas
Urea
ammonia
Ammonia
Monolayers
counters
Gels

Keywords

  • A1. Nanostructures
  • A2. Growth from solutions
  • B1. Nanomaterials
  • B1. Titanium compounds

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Structural control on crystal growth of titanate in aqueous system: Selective production of nanostructures of layered titanate and anatase-type titania",
abstract = "Layered titanate nanosheets and anatase-type titania nanospines were selectively grown from a molecular titanium precursor, TiF4, by a reaction with various cationic species in an agar gel matrix. A layered structure of the titanate was fundamentally produced by the assembly of anionic titanate species with a certain amount of specific cations under a basic condition. Nanoscale flaky and rodlike forms were constructed from the titanate monolayers with sodium and ammonium ions, respectively. On the other hand, anatase-type crystalline titania was formed from TiF4 under an acidic condition or in the absence of a sufficient amount of the cationic species. Especially, a spherical architecture of anatase nanospines was produced through a moderate reaction with ammonia provided by decomposition of urea. The role of the counter cations was essential for the selection of the crystal structures and the construction of the particular rodlike and flaky forms of the layered titanates.",
keywords = "A1. Nanostructures, A2. Growth from solutions, B1. Nanomaterials, B1. Titanium compounds",
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AU - Takezawa, Yoko

AU - Imai, Hiroaki

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N2 - Layered titanate nanosheets and anatase-type titania nanospines were selectively grown from a molecular titanium precursor, TiF4, by a reaction with various cationic species in an agar gel matrix. A layered structure of the titanate was fundamentally produced by the assembly of anionic titanate species with a certain amount of specific cations under a basic condition. Nanoscale flaky and rodlike forms were constructed from the titanate monolayers with sodium and ammonium ions, respectively. On the other hand, anatase-type crystalline titania was formed from TiF4 under an acidic condition or in the absence of a sufficient amount of the cationic species. Especially, a spherical architecture of anatase nanospines was produced through a moderate reaction with ammonia provided by decomposition of urea. The role of the counter cations was essential for the selection of the crystal structures and the construction of the particular rodlike and flaky forms of the layered titanates.

AB - Layered titanate nanosheets and anatase-type titania nanospines were selectively grown from a molecular titanium precursor, TiF4, by a reaction with various cationic species in an agar gel matrix. A layered structure of the titanate was fundamentally produced by the assembly of anionic titanate species with a certain amount of specific cations under a basic condition. Nanoscale flaky and rodlike forms were constructed from the titanate monolayers with sodium and ammonium ions, respectively. On the other hand, anatase-type crystalline titania was formed from TiF4 under an acidic condition or in the absence of a sufficient amount of the cationic species. Especially, a spherical architecture of anatase nanospines was produced through a moderate reaction with ammonia provided by decomposition of urea. The role of the counter cations was essential for the selection of the crystal structures and the construction of the particular rodlike and flaky forms of the layered titanates.

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