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 journalArticlepeer-review

37 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

ASJC Scopus subject areas

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

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