Self-assembled nanofilm of monodisperse cobalt hydroxide hexagonal platelets: Topotactic conversion into oxide and resistive switching

Renzhi Ma, Minoru Osada, Linfeng Hu, Takayoshi Sasaki

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The current work develops a solution-based self-assembling route to construct close-packed nanofilms (thickness ̃ 30 nm) using monodisperse hexagonal platelets of Co(OH)2 as two-dimensional building blocks. The hydroxide film was postannealed and could be transformed into [111]-oriented cobalt monoxide (CoO) in a topotactic fashion retaining the original hexagonal platelet shape. Electrical resistive switching property of as-transformed CoO film was investigated, revealing a gigantic change in electrical resistance (ON/OFF current ratio: 103) and fast switching speed (ns level). This solution-based self-assembly procedure, in combination with a topotactic conversion from lamellar hydroxides to corresponding oxides, offers a new alternative to high-performance thin film devices based on transition metal oxide.

Original languageEnglish
Pages (from-to)6341-6346
Number of pages6
JournalChemistry of Materials
Volume22
Issue number23
DOIs
Publication statusPublished - 2010 Dec 14
Externally publishedYes

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Platelets
Cobalt
Oxides
Hydroxides
Thin film devices
Acoustic impedance
Self assembly
Transition metals
cobalt hydroxide
hydroxide ion

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Self-assembled nanofilm of monodisperse cobalt hydroxide hexagonal platelets : Topotactic conversion into oxide and resistive switching. / Ma, Renzhi; Osada, Minoru; Hu, Linfeng; Sasaki, Takayoshi.

In: Chemistry of Materials, Vol. 22, No. 23, 14.12.2010, p. 6341-6346.

Research output: Contribution to journalArticle

Ma, Renzhi ; Osada, Minoru ; Hu, Linfeng ; Sasaki, Takayoshi. / Self-assembled nanofilm of monodisperse cobalt hydroxide hexagonal platelets : Topotactic conversion into oxide and resistive switching. In: Chemistry of Materials. 2010 ; Vol. 22, No. 23. pp. 6341-6346.
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