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

Renzhi Ma; Minoru Osada; Linfeng Hu; Takayoshi Sasaki

doi:10.1021/cm1021678

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

Renzhi Ma^*, Minoru Osada, Linfeng Hu, Takayoshi Sasaki

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

43 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 language	English
Pages (from-to)	6341-6346
Number of pages	6
Journal	Chemistry of Materials
Volume	22
Issue number	23
DOIs	https://doi.org/10.1021/cm1021678
Publication status	Published - 2010 Dec 14
Externally published	Yes

ASJC Scopus subject areas

Materials Chemistry
Chemical Engineering(all)
Chemistry(all)

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

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.",

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T1 - Self-assembled nanofilm of monodisperse cobalt hydroxide hexagonal platelets

T2 - Topotactic conversion into oxide and resistive switching

AU - Ma, Renzhi

AU - Osada, Minoru

AU - Hu, Linfeng

AU - Sasaki, Takayoshi

PY - 2010/12/14

Y1 - 2010/12/14

N2 - 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.

AB - 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.

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

Abstract

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