Monolayered nanodots of transition metal oxides

Keisuke Nakamura, Yuya Oaki, Hiroaki Imai

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Monolayered nanodots of titanium, tungsten, and manganese oxides were obtained by exfoliation of the nanocrystals through aqueous solution processes at room temperature. The precursor nanocrystals of the layered compounds, such as sodium titanate (Na0.80Ti1.800.2O 4·xH2O, □: vacancy (x < 1.17)), cesium tungstate (Cs4W11O35·yH2O (y < 10.5)), and sodium manganate (Na0.44MnO2· zH2O (z < 0.85)), were synthesized in an aqueous solution. These nanocrystals of the layered compounds were delaminated into the monolayered nanodots through introduction of a bulky organic cation in the interlayer space. The resultant monolayered nanodots of the titanate and tungstate 2-5 nm in lateral size showed a remarkable blueshift of the bandgap energies. The calculation studies supported the blueshifts of the bandgap energies. The results suggest that syntheses of monolayered nanodots can expand the tuning range of the properties based on size effect. The present approaches for generation of ultrathin tiny objects can be applied to a variety of nanomaterials.

Original languageEnglish
Pages (from-to)4501-4508
Number of pages8
JournalJournal of the American Chemical Society
Volume135
Issue number11
DOIs
Publication statusPublished - 2013 Mar 20

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Nanoparticles
Nanocrystals
Oxides
Transition metals
Metals
Energy gap
Sodium
Cesium
Manganese oxide
Nanostructures
Nanostructured materials
Vacancies
Tungsten
Cations
Tuning
Titanium
Positive ions
Temperature
tungstate
titanium dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Monolayered nanodots of transition metal oxides. / Nakamura, Keisuke; Oaki, Yuya; Imai, Hiroaki.

In: Journal of the American Chemical Society, Vol. 135, No. 11, 20.03.2013, p. 4501-4508.

Research output: Contribution to journalArticle

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